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Groups > linux.kernel > #1628188 > unrolled thread
| Started by | Michal Hocko <mhocko@kernel.org> |
|---|---|
| First post | 2017-04-21 14:10 +0200 |
| Last post | 2017-04-21 15:00 +0200 |
| Articles | 10 — 1 participant |
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[PATCH -v3 0/13] mm: make movable onlining suck less Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:10 +0200
[PATCH 05/13] mm, memory_hotplug: split up register_one_node Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:10 +0200
[PATCH 09/13] mm: __first_valid_page skip over offline pages Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:10 +0200
[PATCH 03/13] mm: drop page_initialized check from get_nid_for_pfn Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:10 +0200
[PATCH 04/13] mm, memory_hotplug: get rid of is_zone_device_section Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:10 +0200
[PATCH 13/13] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:30 +0200
[PATCH 12/13] mm, memory_hotplug: fix the section mismatch warning Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:30 +0200
[PATCH 11/13] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:30 +0200
[PATCH 10/13] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko <mhocko@kernel.org> - 2017-04-21 14:40 +0200
Re: [PATCH 10/13] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko <mhocko@kernel.org> - 2017-04-21 15:00 +0200
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:10 +0200 |
| Subject | [PATCH -v3 0/13] mm: make movable onlining suck less |
| Message-ID | <tyFxU-5Ej-13@gated-at.bofh.it> |
Hi,
The last version of this series has been posted here [1]. It has seen
some more testing (thanks to Reza Arbab and Igor Mammedov[2]), Jerome's
and Vlastimil's review resulted in few fixes mostly folded in their
respected patches.
There are 4 more patches (patch 6+ in this series). I have checked the
most prominent pfn walkers to skip over offline holes and now and I feel
more comfortable to have this merged. All the reported issues should be
fixed
There is still a lot of work on top - namely this implementation doesn't
support reonlining to a different zone on the zones boundaries but I
will do that in a separate series because this one is getting quite
large already and it should work reasonably well now.
Joonsoo had some worries about pfn_valid and suggested to change its
semantic to return false on offline holes but I would be rally worried
to change a established semantic used by a lot of code and so I have
introuduced pfn_to_online_page helper instead. If this is seen as a
controversial point I would rather drop pfn_to_online_page and related
patches as they are not stictly necessary because the code would be
similarly broken as now wrt. offline holes.
This is a rebase on top of linux-next (next-20170418) and the full
series is in git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git
try attempts/rewrite-mem_hotplug branch.
Motivation:
Movable onlining is a real hack with many downsides - mainly
reintroduction of lowmem/highmem issues we used to have on 32b systems -
but it is the only way to make the memory hotremove more reliable which
is something that people are asking for.
The current semantic of memory movable onlinening is really cumbersome,
however. The main reason for this is that the udev driven approach is
basically unusable because udev races with the memory probing while only
the last memory block or the one adjacent to the existing zone_movable
are allowed to be onlined movable. In short the criterion for the
successful online_movable changes under udev's feet. A reliable udev
approach would require a 2 phase approach where the first successful
movable online would have to check all the previous blocks and online
them in descending order. This is hard to be considered sane.
This patchset aims at making the onlining semantic more usable. First of
all it allows to online memory movable as long as it doesn't clash with
the existing ZONE_NORMAL. That means that ZONE_NORMAL and ZONE_MOVABLE
cannot overlap. Currently I preserve the original ordering semantic so
the zone always precedes the movable zone but I have plans to remove this
restriction in future because it is not really necessary.
First 3 patches are cleanups which should be ready to be merged right
away (unless I have missed something subtle of course).
Patch 4 deals with ZONE_DEVICE dependencies down the __add_pages path.
Patch 5 deals with implicit assumptions of register_one_node on pgdat
initialization.
Patches 6-10 deal with offline holes in the zone for pfn walkers. I
hope I got all of them right but people familiar with compaction should
double check this.
Patch 11 is the core of the change. In order to make it easier to review
I have tried it to be as minimalistic as possible and the large code
removal is moved to patch 14.
Patch 12 is a trivial follow up cleanup. Patch 13 fixes sparse warnings
and finally patch 14 removes the unused code.
I have tested the patches in kvm:
# qemu-system-x86_64 -enable-kvm -monitor pty -m 2G,slots=4,maxmem=4G -numa node,mem=1G -numa node,mem=1G ...
and then probed the additional memory by
(qemu) object_add memory-backend-ram,id=mem1,size=1G
(qemu) device_add pc-dimm,id=dimm1,memdev=mem1
Then I have used this simple script to probe the memory block by hand
# cat probe_memblock.sh
#!/bin/sh
BLOCK_NR=$1
# echo $((0x100000000+$BLOCK_NR*(128<<20))) > /sys/devices/system/memory/probe
# for i in $(seq 10); do sh probe_memblock.sh $i; done
# grep . /sys/devices/system/memory/memory3?/valid_zones 2>/dev/null
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Normal Movable
/sys/devices/system/memory/memory35/valid_zones:Normal Movable
/sys/devices/system/memory/memory36/valid_zones:Normal Movable
/sys/devices/system/memory/memory37/valid_zones:Normal Movable
/sys/devices/system/memory/memory38/valid_zones:Normal Movable
/sys/devices/system/memory/memory39/valid_zones:Normal Movable
The main difference to the original implementation is that all new
memblocks can be both online_kernel and online_movable initially
because there is no clash obviously. For the comparison the original
implementation would have
/sys/devices/system/memory/memory33/valid_zones:Normal
/sys/devices/system/memory/memory34/valid_zones:Normal
/sys/devices/system/memory/memory35/valid_zones:Normal
/sys/devices/system/memory/memory36/valid_zones:Normal
/sys/devices/system/memory/memory37/valid_zones:Normal
/sys/devices/system/memory/memory38/valid_zones:Normal
/sys/devices/system/memory/memory39/valid_zones:Normal Movable
Now
# echo online_movable > /sys/devices/system/memory/memory34/state
# grep . /sys/devices/system/memory/memory3?/valid_zones 2>/dev/null
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Movable
/sys/devices/system/memory/memory35/valid_zones:Movable
/sys/devices/system/memory/memory36/valid_zones:Movable
/sys/devices/system/memory/memory37/valid_zones:Movable
/sys/devices/system/memory/memory38/valid_zones:Movable
/sys/devices/system/memory/memory39/valid_zones:Movable
Block 33 can still be online both kernel and movable while all
the remaining can be only movable.
/proc/zonelist says
Node 0, zone Normal
pages free 0
min 0
low 0
high 0
spanned 0
present 0
--
Node 0, zone Movable
pages free 32753
min 85
low 117
high 149
spanned 32768
present 32768
A new memblock at a lower address will result in a new memblock (32)
which will still allow both Normal and Movable.
# sh probe_memblock.sh 0
# grep . /sys/devices/system/memory/memory3[2-5]/valid_zones 2>/dev/null
/sys/devices/system/memory/memory32/valid_zones:Normal Movable
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Movable
/sys/devices/system/memory/memory35/valid_zones:Movable
and online_kernel will convert it to the zone normal properly
while 33 can be still onlined both ways.
# echo online_kernel > /sys/devices/system/memory/memory32/state
# grep . /sys/devices/system/memory/memory3[2-5]/valid_zones 2>/dev/null
/sys/devices/system/memory/memory32/valid_zones:Normal
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Movable
/sys/devices/system/memory/memory35/valid_zones:Movable
/proc/zoneinfo will now tell
Node 0, zone Normal
pages free 65441
min 165
low 230
high 295
spanned 65536
present 65536
--
Node 0, zone Movable
pages free 32740
min 82
low 114
high 146
spanned 32768
present 32768
so both zones have one memblock spanned and present.
Onlining 39 should associate this block to the movable zone
# echo online > /sys/devices/system/memory/memory39/state
/proc/zoneinfo will now tell
Node 0, zone Normal
pages free 32765
min 80
low 112
high 144
spanned 32768
present 32768
--
Node 0, zone Movable
pages free 65501
min 160
low 225
high 290
spanned 196608
present 65536
so we will have a movable zone which spans 6 memblocks, 2 present and 4
representing a hole.
Offlining both movable blocks will lead to the zone with no present
pages which is the expected behavior I believe.
# echo offline > /sys/devices/system/memory/memory39/state
# echo offline > /sys/devices/system/memory/memory34/state
# grep -A6 "Movable\|Normal" /proc/zoneinfo
Node 0, zone Normal
pages free 32735
min 90
low 122
high 154
spanned 32768
present 32768
--
Node 0, zone Movable
pages free 0
min 0
low 0
high 0
spanned 196608
present 0
Any thoughts, complains, suggestions?
As a bonus we will get a nice cleanup in the memory hotplug codebase.
arch/ia64/mm/init.c | 11 +-
arch/powerpc/mm/mem.c | 12 +-
arch/s390/mm/init.c | 32 +--
arch/sh/mm/init.c | 10 +-
arch/x86/mm/init_32.c | 7 +-
arch/x86/mm/init_64.c | 11 +-
drivers/base/memory.c | 79 +++----
drivers/base/node.c | 58 ++----
include/linux/memory_hotplug.h | 40 +++-
include/linux/mmzone.h | 44 +++-
include/linux/node.h | 35 +++-
kernel/memremap.c | 6 +-
mm/compaction.c | 5 +-
mm/memory_hotplug.c | 455 ++++++++++++++---------------------------
mm/page_alloc.c | 13 +-
mm/page_isolation.c | 26 ++-
mm/sparse.c | 48 ++++-
17 files changed, 407 insertions(+), 485 deletions(-)
Shortlog says:
Michal Hocko (13):
mm: remove return value from init_currently_empty_zone
mm, memory_hotplug: use node instead of zone in can_online_high_movable
mm: drop page_initialized check from get_nid_for_pfn
mm, memory_hotplug: get rid of is_zone_device_section
mm, memory_hotplug: split up register_one_node
mm, memory_hotplug: consider offline memblocks removable
mm: consider zone which is not fully populated to have holes
mm, compaction: skip over holes in __reset_isolation_suitable
mm: __first_valid_page skip over offline pages
mm, memory_hotplug: do not associate hotadded memory to zones until online
mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory
mm, memory_hotplug: fix the section mismatch warning
mm, memory_hotplug: remove unused cruft after memory hotplug rework
[1] http://lkml.kernel.org/r/20170410110351.12215-1-mhocko@kernel.org
[2] http://lkml.kernel.org/r/20170410162749.7d7f31c1@nial.brq.redhat.com
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:10 +0200 |
| Subject | [PATCH 05/13] mm, memory_hotplug: split up register_one_node |
| Message-ID | <tyFxU-5Ej-27@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
Memory hotplug (add_memory_resource) has to reinitialize node
infrastructure if the node is offline (one which went through the
complete add_memory(); remove_memory() cycle). That involves node
registration to the kobj infrastructure (register_node), the proper
association with cpus (register_cpu_under_node) and finally creation of
node<->memblock symlinks (link_mem_sections).
The last part requires to know node_start_pfn and node_spanned_pages
which we currently have but a leter patch will postpone this
initialization to the onlining phase which happens later. In fact we do
not need to rely on the early pgdat initialization even now because the
currently hot added pfn range is currently known.
Split register_one_node into core which does all the common work for
the boot time NUMA initialization and the hotplug (__register_one_node).
register_one_node keeps the full initialization while hotplug calls
__register_one_node and manually calls link_mem_sections for the proper
range.
This shouldn't introduce any functional change.
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
drivers/base/node.c | 51 ++++++++++++++++++++-------------------------------
include/linux/node.h | 35 ++++++++++++++++++++++++++++++++++-
mm/memory_hotplug.c | 17 ++++++++++++++++-
3 files changed, 70 insertions(+), 33 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 06294d69779b..dff5b53f7905 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -461,10 +461,9 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
return 0;
}
-static int link_mem_sections(int nid)
+int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
{
- unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
- unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
+ unsigned long end_pfn = start_pfn + nr_pages;
unsigned long pfn;
struct memory_block *mem_blk = NULL;
int err = 0;
@@ -552,10 +551,7 @@ static int node_memory_callback(struct notifier_block *self,
return NOTIFY_OK;
}
#endif /* CONFIG_HUGETLBFS */
-#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
-
-static int link_mem_sections(int nid) { return 0; }
-#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
+#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
!defined(CONFIG_HUGETLBFS)
@@ -569,39 +565,32 @@ static void init_node_hugetlb_work(int nid) { }
#endif
-int register_one_node(int nid)
+int __register_one_node(int nid)
{
- int error = 0;
+ int p_node = parent_node(nid);
+ struct node *parent = NULL;
+ int error;
int cpu;
- if (node_online(nid)) {
- int p_node = parent_node(nid);
- struct node *parent = NULL;
-
- if (p_node != nid)
- parent = node_devices[p_node];
-
- node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
- if (!node_devices[nid])
- return -ENOMEM;
-
- error = register_node(node_devices[nid], nid, parent);
+ if (p_node != nid)
+ parent = node_devices[p_node];
- /* link cpu under this node */
- for_each_present_cpu(cpu) {
- if (cpu_to_node(cpu) == nid)
- register_cpu_under_node(cpu, nid);
- }
+ node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
+ if (!node_devices[nid])
+ return -ENOMEM;
- /* link memory sections under this node */
- error = link_mem_sections(nid);
+ error = register_node(node_devices[nid], nid, parent);
- /* initialize work queue for memory hot plug */
- init_node_hugetlb_work(nid);
+ /* link cpu under this node */
+ for_each_present_cpu(cpu) {
+ if (cpu_to_node(cpu) == nid)
+ register_cpu_under_node(cpu, nid);
}
- return error;
+ /* initialize work queue for memory hot plug */
+ init_node_hugetlb_work(nid);
+ return error;
}
void unregister_one_node(int nid)
diff --git a/include/linux/node.h b/include/linux/node.h
index 2115ad5d6f19..d1751beb462c 100644
--- a/include/linux/node.h
+++ b/include/linux/node.h
@@ -30,9 +30,38 @@ struct memory_block;
extern struct node *node_devices[];
typedef void (*node_registration_func_t)(struct node *);
+#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
+extern int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages);
+#else
+static inline int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
+{
+ return 0;
+}
+#endif
+
extern void unregister_node(struct node *node);
#ifdef CONFIG_NUMA
-extern int register_one_node(int nid);
+/* Core of the node registration - only memory hotplug should use this */
+extern int __register_one_node(int nid);
+
+/* Registers an online node */
+static inline int register_one_node(int nid)
+{
+ int error = 0;
+
+ if (node_online(nid)) {
+ struct pglist_data *pgdat = NODE_DATA(nid);
+
+ error = __register_one_node(nid);
+ if (error)
+ return error;
+ /* link memory sections under this node */
+ error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages);
+ }
+
+ return error;
+}
+
extern void unregister_one_node(int nid);
extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
@@ -46,6 +75,10 @@ extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
node_registration_func_t unregister);
#endif
#else
+static inline int __register_one_node(int nid)
+{
+ return 0;
+}
static inline int register_one_node(int nid)
{
return 0;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c0147d3024eb..caa58338d121 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1388,7 +1388,22 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
node_set_online(nid);
if (new_node) {
- ret = register_one_node(nid);
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ ret = __register_one_node(nid);
+ if (ret)
+ goto register_fail;
+
+ /*
+ * link memory sections under this node. This is already
+ * done when creatig memory section in register_new_memory
+ * but that depends to have the node registered so offline
+ * nodes have to go through register_node.
+ * TODO clean up this mess.
+ */
+ ret = link_mem_sections(nid, start_pfn, nr_pages);
+register_fail:
/*
* If sysfs file of new node can't create, cpu on the node
* can't be hot-added. There is no rollback way now.
--
2.11.0
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:10 +0200 |
| Subject | [PATCH 09/13] mm: __first_valid_page skip over offline pages |
| Message-ID | <tyFxV-5Ej-35@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
__first_valid_page skips over invalid pfns in the range but it might
still stumble over offline pages. At least start_isolate_page_range
will mark those set_migratetype_isolate. This doesn't represent
any immediate AFAICS because alloc_contig_range will fail to isolate
those pages but it relies on not fully initialized page which will
become a problem later when we stop associating offline pages to zones.
So this is more a preparatory patch than a fix.
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/page_isolation.c | 26 ++++++++++++++++++--------
1 file changed, 18 insertions(+), 8 deletions(-)
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 5092e4ef00c8..3606104893e0 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -138,12 +138,18 @@ static inline struct page *
__first_valid_page(unsigned long pfn, unsigned long nr_pages)
{
int i;
- for (i = 0; i < nr_pages; i++)
- if (pfn_valid_within(pfn + i))
- break;
- if (unlikely(i == nr_pages))
- return NULL;
- return pfn_to_page(pfn + i);
+
+ for (i = 0; i < nr_pages; i++) {
+ struct page *page;
+
+ if (!pfn_valid_within(pfn + i))
+ continue;
+ page = pfn_to_online_page(pfn + i);
+ if (!page)
+ continue;
+ return page;
+ }
+ return NULL;
}
/*
@@ -184,8 +190,12 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
undo:
for (pfn = start_pfn;
pfn < undo_pfn;
- pfn += pageblock_nr_pages)
- unset_migratetype_isolate(pfn_to_page(pfn), migratetype);
+ pfn += pageblock_nr_pages) {
+ struct page *page = pfn_to_online_page(pfn);
+ if (!page)
+ continue;
+ unset_migratetype_isolate(page, migratetype);
+ }
return -EBUSY;
}
--
2.11.0
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:10 +0200 |
| Subject | [PATCH 03/13] mm: drop page_initialized check from get_nid_for_pfn |
| Message-ID | <tyFxV-5Ej-39@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
c04fc586c1a4 ("mm: show node to memory section relationship with
symlinks in sysfs") has added means to export memblock<->node
association into the sysfs. It has also introduced get_nid_for_pfn
which is a rather confusing counterpart of pfn_to_nid which checks also
whether the pfn page is already initialized (page_initialized). This
is done by checking page::lru != NULL which doesn't make any sense at
all. Nothing in this path really relies on the lru list being used or
initialized. Just remove it because this will become a problem with
later patches.
Thanks to Reza Arbab for testing which revealed this to be a problem
(http://lkml.kernel.org/r/20170403202337.GA12482@dhcp22.suse.cz)
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
drivers/base/node.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 5548f9686016..06294d69779b 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -368,21 +368,14 @@ int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
}
#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
-#define page_initialized(page) (page->lru.next)
-
static int __ref get_nid_for_pfn(unsigned long pfn)
{
- struct page *page;
-
if (!pfn_valid_within(pfn))
return -1;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
if (system_state == SYSTEM_BOOTING)
return early_pfn_to_nid(pfn);
#endif
- page = pfn_to_page(pfn);
- if (!page_initialized(page))
- return -1;
return pfn_to_nid(pfn);
}
--
2.11.0
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:10 +0200 |
| Subject | [PATCH 04/13] mm, memory_hotplug: get rid of is_zone_device_section |
| Message-ID | <tyFxU-5Ej-25@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
device memory hotplug hooks into regular memory hotplug only half way.
It needs memory sections to track struct pages but there is no
need/desire to associate those sections with memory blocks and export
them to the userspace via sysfs because they cannot be onlined anyway.
This is currently expressed by for_device argument to arch_add_memory
which then makes sure to associate the given memory range with
ZONE_DEVICE. register_new_memory then relies on is_zone_device_section
to distinguish special memory hotplug from the regular one. While this
works now, later patches in this series want to move __add_zone outside
of arch_add_memory path so we have to come up with something else.
Add want_memblock down the __add_pages path and use it to control
whether the section->memblock association should be done. arch_add_memory
then just trivially want memblock for everything but for_device hotplug.
remove_memory_section doesn't need is_zone_device_section either. We can
simply skip all the memblock specific cleanup if there is no memblock
for the given section.
This shouldn't introduce any functional change.
Changes since v1
- return 0 if want_memblock == 0 from __add_section as per Jerome Glisse
Changes since v2
- fix remove_memory_section unlock on find_memory_block failure
as per Jerome - spotted by Evgeny Baskakov
Cc: Dan Williams <dan.j.williams@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
arch/ia64/mm/init.c | 2 +-
arch/powerpc/mm/mem.c | 2 +-
arch/s390/mm/init.c | 2 +-
arch/sh/mm/init.c | 2 +-
arch/x86/mm/init_32.c | 2 +-
arch/x86/mm/init_64.c | 2 +-
drivers/base/memory.c | 23 +++++++++--------------
include/linux/memory_hotplug.h | 2 +-
mm/memory_hotplug.c | 9 ++++++---
9 files changed, 22 insertions(+), 24 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 8f3efa682ee8..39e2aeb4669d 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -658,7 +658,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
zone = pgdat->node_zones +
zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
- ret = __add_pages(nid, zone, start_pfn, nr_pages);
+ ret = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9ee536ec0739..e6b2e6618b6c 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -151,7 +151,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
zone = pgdata->node_zones +
zone_for_memory(nid, start, size, 0, for_device);
- return __add_pages(nid, zone, start_pfn, nr_pages);
+ return __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index ee6a1d3d4983..893cf88cf02d 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -191,7 +191,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
continue;
nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
zone_end_pfn - start_pfn : size_pages;
- rc = __add_pages(nid, zone, start_pfn, nr_pages);
+ rc = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
if (rc)
break;
start_pfn += nr_pages;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 75491862d900..a9d57f75ae8c 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -498,7 +498,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
ret = __add_pages(nid, pgdat->node_zones +
zone_for_memory(nid, start, size, ZONE_NORMAL,
for_device),
- start_pfn, nr_pages);
+ start_pfn, nr_pages, !for_device);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 99fb83819a5f..94594b889144 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -831,7 +831,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- return __add_pages(nid, zone, start_pfn, nr_pages);
+ return __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 5ee314c978ce..53eeb01b7888 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -697,7 +697,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
init_memory_mapping(start, start + size);
- ret = __add_pages(nid, zone, start_pfn, nr_pages);
+ ret = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
WARN_ON_ONCE(ret);
/* update max_pfn, max_low_pfn and high_memory */
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index cc4f1d0cbffe..a6e11fa6406b 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -685,14 +685,6 @@ static int add_memory_block(int base_section_nr)
return 0;
}
-static bool is_zone_device_section(struct mem_section *ms)
-{
- struct page *page;
-
- page = sparse_decode_mem_map(ms->section_mem_map, __section_nr(ms));
- return is_zone_device_page(page);
-}
-
/*
* need an interface for the VM to add new memory regions,
* but without onlining it.
@@ -702,9 +694,6 @@ int register_new_memory(int nid, struct mem_section *section)
int ret = 0;
struct memory_block *mem;
- if (is_zone_device_section(section))
- return 0;
-
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
@@ -741,11 +730,16 @@ static int remove_memory_section(unsigned long node_id,
{
struct memory_block *mem;
- if (is_zone_device_section(section))
- return 0;
-
mutex_lock(&mem_sysfs_mutex);
+
+ /*
+ * Some users of the memory hotplug do not want/need memblock to
+ * track all sections. Skip over those.
+ */
mem = find_memory_block(section);
+ if (!mem)
+ goto out_unlock;
+
unregister_mem_sect_under_nodes(mem, __section_nr(section));
mem->section_count--;
@@ -754,6 +748,7 @@ static int remove_memory_section(unsigned long node_id,
else
put_device(&mem->dev);
+out_unlock:
mutex_unlock(&mem_sysfs_mutex);
return 0;
}
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 134a2f69c21a..3c8cf86201c3 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -111,7 +111,7 @@ extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
/* reasonably generic interface to expand the physical pages in a zone */
extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
- unsigned long nr_pages);
+ unsigned long nr_pages, bool want_memblock);
#ifdef CONFIG_NUMA
extern int memory_add_physaddr_to_nid(u64 start);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6b6362819be2..c0147d3024eb 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -494,7 +494,7 @@ static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
}
static int __meminit __add_section(int nid, struct zone *zone,
- unsigned long phys_start_pfn)
+ unsigned long phys_start_pfn, bool want_memblock)
{
int ret;
@@ -511,6 +511,9 @@ static int __meminit __add_section(int nid, struct zone *zone,
if (ret < 0)
return ret;
+ if (!want_memblock)
+ return 0;
+
return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
}
@@ -521,7 +524,7 @@ static int __meminit __add_section(int nid, struct zone *zone,
* add the new pages.
*/
int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
- unsigned long nr_pages)
+ unsigned long nr_pages, bool want_memblock)
{
unsigned long i;
int err = 0;
@@ -549,7 +552,7 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
}
for (i = start_sec; i <= end_sec; i++) {
- err = __add_section(nid, zone, section_nr_to_pfn(i));
+ err = __add_section(nid, zone, section_nr_to_pfn(i), want_memblock);
/*
* EEXIST is finally dealt with by ioresource collision
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:30 +0200 |
| Subject | [PATCH 13/13] mm, memory_hotplug: remove unused cruft after memory hotplug rework |
| Message-ID | <tyFRf-5KO-7@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
zone_for_memory doesn't have any user anymore as well as the whole zone
shifting infrastructure so drop them all.
This shouldn't introduce any functional changes.
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
include/linux/memory_hotplug.h | 2 -
mm/memory_hotplug.c | 207 -----------------------------------------
2 files changed, 209 deletions(-)
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index e1193c44aed1..aec88657ec49 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -295,8 +295,6 @@ extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
void *arg, int (*func)(struct memory_block *, void *));
extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource, bool online);
-extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
- bool for_device);
extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index f9e916a85792..de30822642c6 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -300,180 +300,6 @@ void __init register_page_bootmem_info_node(struct pglist_data *pgdat)
}
#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
-static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- unsigned long old_zone_end_pfn;
-
- zone_span_writelock(zone);
-
- old_zone_end_pfn = zone_end_pfn(zone);
- if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)
- zone->zone_start_pfn = start_pfn;
-
- zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
- zone->zone_start_pfn;
-
- zone_span_writeunlock(zone);
-}
-
-static void resize_zone(struct zone *zone, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- zone_span_writelock(zone);
-
- if (end_pfn - start_pfn) {
- zone->zone_start_pfn = start_pfn;
- zone->spanned_pages = end_pfn - start_pfn;
- } else {
- /*
- * make it consist as free_area_init_core(),
- * if spanned_pages = 0, then keep start_pfn = 0
- */
- zone->zone_start_pfn = 0;
- zone->spanned_pages = 0;
- }
-
- zone_span_writeunlock(zone);
-}
-
-static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- enum zone_type zid = zone_idx(zone);
- int nid = zone->zone_pgdat->node_id;
- unsigned long pfn;
-
- for (pfn = start_pfn; pfn < end_pfn; pfn++)
- set_page_links(pfn_to_page(pfn), zid, nid, pfn);
-}
-
-static void __ref ensure_zone_is_initialized(struct zone *zone,
- unsigned long start_pfn, unsigned long num_pages)
-{
- if (!zone_is_initialized(zone))
- init_currently_empty_zone(zone, start_pfn, num_pages);
-}
-
-static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
- unsigned long start_pfn, unsigned long end_pfn)
-{
- unsigned long flags;
- unsigned long z1_start_pfn;
-
- ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
-
- pgdat_resize_lock(z1->zone_pgdat, &flags);
-
- /* can't move pfns which are higher than @z2 */
- if (end_pfn > zone_end_pfn(z2))
- goto out_fail;
- /* the move out part must be at the left most of @z2 */
- if (start_pfn > z2->zone_start_pfn)
- goto out_fail;
- /* must included/overlap */
- if (end_pfn <= z2->zone_start_pfn)
- goto out_fail;
-
- /* use start_pfn for z1's start_pfn if z1 is empty */
- if (!zone_is_empty(z1))
- z1_start_pfn = z1->zone_start_pfn;
- else
- z1_start_pfn = start_pfn;
-
- resize_zone(z1, z1_start_pfn, end_pfn);
- resize_zone(z2, end_pfn, zone_end_pfn(z2));
-
- pgdat_resize_unlock(z1->zone_pgdat, &flags);
-
- fix_zone_id(z1, start_pfn, end_pfn);
-
- return 0;
-out_fail:
- pgdat_resize_unlock(z1->zone_pgdat, &flags);
- return -1;
-}
-
-static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
- unsigned long start_pfn, unsigned long end_pfn)
-{
- unsigned long flags;
- unsigned long z2_end_pfn;
-
- ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
-
- pgdat_resize_lock(z1->zone_pgdat, &flags);
-
- /* can't move pfns which are lower than @z1 */
- if (z1->zone_start_pfn > start_pfn)
- goto out_fail;
- /* the move out part mast at the right most of @z1 */
- if (zone_end_pfn(z1) > end_pfn)
- goto out_fail;
- /* must included/overlap */
- if (start_pfn >= zone_end_pfn(z1))
- goto out_fail;
-
- /* use end_pfn for z2's end_pfn if z2 is empty */
- if (!zone_is_empty(z2))
- z2_end_pfn = zone_end_pfn(z2);
- else
- z2_end_pfn = end_pfn;
-
- resize_zone(z1, z1->zone_start_pfn, start_pfn);
- resize_zone(z2, start_pfn, z2_end_pfn);
-
- pgdat_resize_unlock(z1->zone_pgdat, &flags);
-
- fix_zone_id(z2, start_pfn, end_pfn);
-
- return 0;
-out_fail:
- pgdat_resize_unlock(z1->zone_pgdat, &flags);
- return -1;
-}
-
-static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
- unsigned long end_pfn)
-{
- unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat);
-
- if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
- pgdat->node_start_pfn = start_pfn;
-
- pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
- pgdat->node_start_pfn;
-}
-
-static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
-{
- struct pglist_data *pgdat = zone->zone_pgdat;
- int nr_pages = PAGES_PER_SECTION;
- int nid = pgdat->node_id;
- int zone_type;
- unsigned long flags, pfn;
-
- zone_type = zone - pgdat->node_zones;
- ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
-
- pgdat_resize_lock(zone->zone_pgdat, &flags);
- grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
- grow_pgdat_span(zone->zone_pgdat, phys_start_pfn,
- phys_start_pfn + nr_pages);
- pgdat_resize_unlock(zone->zone_pgdat, &flags);
- memmap_init_zone(nr_pages, nid, zone_type,
- phys_start_pfn, MEMMAP_HOTPLUG);
-
- /* online_page_range is called later and expects pages reserved */
- for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) {
- if (!pfn_valid(pfn))
- continue;
-
- SetPageReserved(pfn_to_page(pfn));
- }
- return 0;
-}
-
static int __meminit __add_section(int nid, unsigned long phys_start_pfn,
bool want_memblock)
{
@@ -1352,39 +1178,6 @@ static int check_hotplug_memory_range(u64 start, u64 size)
return 0;
}
-/*
- * If movable zone has already been setup, newly added memory should be check.
- * If its address is higher than movable zone, it should be added as movable.
- * Without this check, movable zone may overlap with other zone.
- */
-static int should_add_memory_movable(int nid, u64 start, u64 size)
-{
- unsigned long start_pfn = start >> PAGE_SHIFT;
- pg_data_t *pgdat = NODE_DATA(nid);
- struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
-
- if (zone_is_empty(movable_zone))
- return 0;
-
- if (movable_zone->zone_start_pfn <= start_pfn)
- return 1;
-
- return 0;
-}
-
-int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
- bool for_device)
-{
-#ifdef CONFIG_ZONE_DEVICE
- if (for_device)
- return ZONE_DEVICE;
-#endif
- if (should_add_memory_movable(nid, start, size))
- return ZONE_MOVABLE;
-
- return zone_default;
-}
-
static int online_memory_block(struct memory_block *mem, void *arg)
{
return device_online(&mem->dev);
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:30 +0200 |
| Subject | [PATCH 12/13] mm, memory_hotplug: fix the section mismatch warning |
| Message-ID | <tyFRg-5KO-19@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
Tobias has reported following section mismatches introduced by "mm,
memory_hotplug: do not associate hotadded memory to zones until online".
WARNING: mm/built-in.o(.text+0x5a1c2): Section mismatch in reference from the function move_pfn_range_to_zone() to the function .meminit.text:memmap_init_zone()
The function move_pfn_range_to_zone() references
the function __meminit memmap_init_zone().
This is often because move_pfn_range_to_zone lacks a __meminit
annotation or the annotation of memmap_init_zone is wrong.
WARNING: mm/built-in.o(.text+0x5a25b): Section mismatch in reference from the function move_pfn_range_to_zone() to the function .meminit.text:init_currently_empty_zone()
The function move_pfn_range_to_zone() references
the function __meminit init_currently_empty_zone().
This is often because move_pfn_range_to_zone lacks a __meminit
annotation or the annotation of init_currently_empty_zone is wrong.
WARNING: vmlinux.o(.text+0x188aa2): Section mismatch in reference from the function move_pfn_range_to_zone() to the function .meminit.text:memmap_init_zone()
The function move_pfn_range_to_zone() references
the function __meminit memmap_init_zone().
This is often because move_pfn_range_to_zone lacks a __meminit
annotation or the annotation of memmap_init_zone is wrong.
WARNING: vmlinux.o(.text+0x188b3b): Section mismatch in reference from the function move_pfn_range_to_zone() to the function .meminit.text:init_currently_empty_zone()
The function move_pfn_range_to_zone() references
the function __meminit init_currently_empty_zone().
This is often because move_pfn_range_to_zone lacks a __meminit
annotation or the annotation of init_currently_empty_zone is wrong.
Both memmap_init_zone and init_currently_empty_zone are marked __meminit
but move_pfn_range_to_zone is used outside of __meminit sections (e.g.
devm_memremap_pages) so we have to hide it from the checker by __ref
annotation.
Reported-by: Tobias Regnery <tobias.regnery@gmail.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
mm/memory_hotplug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c5ca2a8571d0..f9e916a85792 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1070,7 +1070,7 @@ static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned lon
pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn;
}
-void move_pfn_range_to_zone(struct zone *zone,
+void __ref move_pfn_range_to_zone(struct zone *zone,
unsigned long start_pfn, unsigned long nr_pages)
{
struct pglist_data *pgdat = zone->zone_pgdat;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:30 +0200 |
| Subject | [PATCH 11/13] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory |
| Message-ID | <tyFRg-5KO-23@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
arch_add_memory gets for_device argument which then controls whether we
want to create memblocks for created memory sections. Simplify the logic
by telling whether we want memblocks directly rather than going through
pointless negation. This also makes the api easier to understand because
it is clear what we want rather than nothing telling for_device which
can mean anything.
This shouldn't introduce any functional change.
Cc: Dan Williams <dan.j.williams@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
arch/ia64/mm/init.c | 4 ++--
arch/powerpc/mm/mem.c | 4 ++--
arch/s390/mm/init.c | 4 ++--
arch/sh/mm/init.c | 4 ++--
arch/x86/mm/init_32.c | 4 ++--
arch/x86/mm/init_64.c | 4 ++--
include/linux/memory_hotplug.h | 2 +-
kernel/memremap.c | 2 +-
mm/memory_hotplug.c | 2 +-
9 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 80db57d063d0..a4e8d6bd9cfa 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -646,13 +646,13 @@ mem_init (void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 72c46eb53215..de5a90e1ceaa 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -126,7 +126,7 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
return -ENODEV;
}
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -143,7 +143,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
return -EFAULT;
}
- return __add_pages(nid, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 862824924ba6..f4fb5d191562 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -162,7 +162,7 @@ unsigned long memory_block_size_bytes(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
@@ -172,7 +172,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
if (rc)
return rc;
- rc = __add_pages(nid, start_pfn, size_pages, !for_device);
+ rc = __add_pages(nid, start_pfn, size_pages, want_memblock);
if (rc)
vmem_remove_mapping(start, size);
return rc;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 3813a610a2bb..bf726af5f1a5 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -485,14 +485,14 @@ void free_initrd_mem(unsigned long start, unsigned long end)
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
/* We only have ZONE_NORMAL, so this is easy.. */
- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index a424066d0552..8a64a6f2848d 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -823,12 +823,12 @@ void __init mem_init(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- return __add_pages(nid, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, want_memblock);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index f07c850efa30..ffeba90c3449 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -682,7 +682,7 @@ static void update_end_of_memory_vars(u64 start, u64 size)
}
}
-int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
+int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -690,7 +690,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
init_memory_mapping(start, start + size);
- ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, want_memblock);
WARN_ON_ONCE(ret);
/* update max_pfn, max_low_pfn and high_memory */
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 9cd76ff7b0c5..e1193c44aed1 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -297,7 +297,7 @@ extern int add_memory(int nid, u64 start, u64 size);
extern int add_memory_resource(int nid, struct resource *resource, bool online);
extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
bool for_device);
-extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
+extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 61aaa41f4e18..ea714eee029c 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -363,7 +363,7 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
goto err_pfn_remap;
mem_hotplug_begin();
- error = arch_add_memory(nid, align_start, align_size, true);
+ error = arch_add_memory(nid, align_start, align_size, false);
if (!error)
move_pfn_range_to_zone(&NODE_DATA(nid)->node_zones[ZONE_DEVICE],
align_start >> PAGE_SHIFT,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 64b5b5b191a0..c5ca2a8571d0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1430,7 +1430,7 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
}
/* call arch's memory hotadd */
- ret = arch_add_memory(nid, start, size, false);
+ ret = arch_add_memory(nid, start, size, true);
if (ret < 0)
goto error;
--
2.11.0
[toc] | [prev] | [next] | [standalone]
| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 14:40 +0200 |
| Subject | [PATCH 10/13] mm, memory_hotplug: do not associate hotadded memory to zones until online |
| Message-ID | <tyG0W-5O5-9@gated-at.bofh.it> |
| In reply to | #1628188 |
From: Michal Hocko <mhocko@suse.com>
The current memory hotplug implementation relies on having all the
struct pages associate with a zone/node during the physical hotplug phase
(arch_add_memory->__add_pages->__add_section->__add_zone). In the vast
majority of cases this means that they are added to ZONE_NORMAL. This
has been so since 9d99aaa31f59 ("[PATCH] x86_64: Support memory hotadd
without sparsemem") and it wasn't a big deal back then because movable
onlining didn't exist yet.
Much later memory hotplug wanted to (ab)use ZONE_MOVABLE for movable
onlining 511c2aba8f07 ("mm, memory-hotplug: dynamic configure movable
memory and portion memory") and then things got more complicated. Rather
than reconsidering the zone association which was no longer needed
(because the memory hotplug already depended on SPARSEMEM) a convoluted
semantic of zone shifting has been developed. Only the currently last
memblock or the one adjacent to the zone_movable can be onlined movable.
This essentially means that the online type changes as the new memblocks
are added.
Let's simulate memory hot online manually
$ echo 0x100000000 > /sys/devices/system/memory/probe
$ grep . /sys/devices/system/memory/memory32/valid_zones
Normal Movable
$ echo $((0x100000000+(128<<20))) > /sys/devices/system/memory/probe
$ grep . /sys/devices/system/memory/memory3?/valid_zones
/sys/devices/system/memory/memory32/valid_zones:Normal
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
$ echo $((0x100000000+2*(128<<20))) > /sys/devices/system/memory/probe
$ grep . /sys/devices/system/memory/memory3?/valid_zones
/sys/devices/system/memory/memory32/valid_zones:Normal
/sys/devices/system/memory/memory33/valid_zones:Normal
/sys/devices/system/memory/memory34/valid_zones:Normal Movable
$ echo online_movable > /sys/devices/system/memory/memory34/state
$ grep . /sys/devices/system/memory/memory3?/valid_zones
/sys/devices/system/memory/memory32/valid_zones:Normal
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Movable Normal
This is an awkward semantic because an udev event is sent as soon as the
block is onlined and an udev handler might want to online it based on
some policy (e.g. association with a node) but it will inherently race
with new blocks showing up.
This patch changes the physical online phase to not associate pages
with any zone at all. All the pages are just marked reserved and wait
for the onlining phase to be associated with the zone as per the online
request. There are only two requirements
- existing ZONE_NORMAL and ZONE_MOVABLE cannot overlap
- ZONE_NORMAL precedes ZONE_MOVABLE in physical addresses
the later on is not an inherent requirement and can be changed in the
future. It preserves the current behavior and made the code slightly
simpler. This is subject to change in future.
This means that the same physical online steps as above will lead to the
following state:
Normal Movable
/sys/devices/system/memory/memory32/valid_zones:Normal Movable
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory32/valid_zones:Normal Movable
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Normal Movable
/sys/devices/system/memory/memory32/valid_zones:Normal Movable
/sys/devices/system/memory/memory33/valid_zones:Normal Movable
/sys/devices/system/memory/memory34/valid_zones:Movable
Implementation:
The current move_pfn_range is reimplemented to check the above
requirements (allow_online_pfn_range) and then updates the respective
zone (move_pfn_range_to_zone), the pgdat and links all the pages in the
pfn range with the zone/node. __add_pages is updated to not require the
zone and only initializes sections in the range. This allowed to
simplify the arch_add_memory code (s390 could get rid of quite some
of code).
devm_memremap_pages is the only user of arch_add_memory which relies
on the zone association because it only hooks into the memory hotplug
only half way. It uses it to associate the new memory with ZONE_DEVICE
but doesn't allow it to be {on,off}lined via sysfs. This means that this
particular code path has to call move_pfn_range_to_zone explicitly.
The original zone shifting code is kept in place and will be removed in
the follow up patch for an easier review.
Please note that this patch also changes the original behavior when
offlining a memory block adjacent to another zone (Normal vs. Movable)
used to allow to change its movable type. This will be handled later.
Changes since v1
- we have to associate the page with the node early (in __add_section),
because pfn_to_node depends on struct page containing this
information - based on testing by Reza Arbab
- resize_{zone,pgdat}_range has to check whether they are popoulated -
Reza Arbab
- fix devm_memremap_pages to use pfn rather than physical address -
Jérôme Glisse
- move_pfn_range has to check for intersection with zone_movable rather
than to rely on allow_online_pfn_range(MMOP_ONLINE_MOVABLE) for
MMOP_ONLINE_KEEP
Changes since v2
- fix show_valid_zones nr_pages calculation
- allow_online_pfn_range has to check managed pages rather than present
- zone_intersects fix bogus check
- fix zone_intersects + few nits as per Vlastimil
Cc: Dan Williams <dan.j.williams@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linux-arch@vger.kernel.org
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # For s390 bits
Tested-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
arch/ia64/mm/init.c | 9 +-
arch/powerpc/mm/mem.c | 10 +-
arch/s390/mm/init.c | 30 +-----
arch/sh/mm/init.c | 8 +-
arch/x86/mm/init_32.c | 5 +-
arch/x86/mm/init_64.c | 9 +-
drivers/base/memory.c | 52 ++++++-----
include/linux/memory_hotplug.h | 13 +--
include/linux/mmzone.h | 20 ++++
kernel/memremap.c | 4 +
mm/memory_hotplug.c | 204 +++++++++++++++++++++++++----------------
mm/sparse.c | 3 +-
12 files changed, 193 insertions(+), 174 deletions(-)
diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 39e2aeb4669d..80db57d063d0 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -648,18 +648,11 @@ mem_init (void)
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- pg_data_t *pgdat;
- struct zone *zone;
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- pgdat = NODE_DATA(nid);
-
- zone = pgdat->node_zones +
- zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
- ret = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
-
+ ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
if (ret)
printk("%s: Problem encountered in __add_pages() as ret=%d\n",
__func__, ret);
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index e6b2e6618b6c..72c46eb53215 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -128,16 +128,12 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- struct pglist_data *pgdata;
- struct zone *zone;
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int rc;
resize_hpt_for_hotplug(memblock_phys_mem_size());
- pgdata = NODE_DATA(nid);
-
start = (unsigned long)__va(start);
rc = create_section_mapping(start, start + size);
if (rc) {
@@ -147,11 +143,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
return -EFAULT;
}
- /* this should work for most non-highmem platforms */
- zone = pgdata->node_zones +
- zone_for_memory(nid, start, size, 0, for_device);
-
- return __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, !for_device);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 893cf88cf02d..862824924ba6 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -164,41 +164,15 @@ unsigned long memory_block_size_bytes(void)
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
- pg_data_t *pgdat = NODE_DATA(nid);
- struct zone *zone;
- int rc, i;
+ int rc;
rc = vmem_add_mapping(start, size);
if (rc)
return rc;
- for (i = 0; i < MAX_NR_ZONES; i++) {
- zone = pgdat->node_zones + i;
- if (zone_idx(zone) != ZONE_MOVABLE) {
- /* Add range within existing zone limits, if possible */
- zone_start_pfn = zone->zone_start_pfn;
- zone_end_pfn = zone->zone_start_pfn +
- zone->spanned_pages;
- } else {
- /* Add remaining range to ZONE_MOVABLE */
- zone_start_pfn = start_pfn;
- zone_end_pfn = start_pfn + size_pages;
- }
- if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
- continue;
- nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
- zone_end_pfn - start_pfn : size_pages;
- rc = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
- if (rc)
- break;
- start_pfn += nr_pages;
- size_pages -= nr_pages;
- if (!size_pages)
- break;
- }
+ rc = __add_pages(nid, start_pfn, size_pages, !for_device);
if (rc)
vmem_remove_mapping(start, size);
return rc;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index a9d57f75ae8c..3813a610a2bb 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -487,18 +487,12 @@ void free_initrd_mem(unsigned long start, unsigned long end)
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- pg_data_t *pgdat;
unsigned long start_pfn = PFN_DOWN(start);
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- pgdat = NODE_DATA(nid);
-
/* We only have ZONE_NORMAL, so this is easy.. */
- ret = __add_pages(nid, pgdat->node_zones +
- zone_for_memory(nid, start, size, ZONE_NORMAL,
- for_device),
- start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 94594b889144..a424066d0552 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -825,13 +825,10 @@ void __init mem_init(void)
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- struct pglist_data *pgdata = NODE_DATA(nid);
- struct zone *zone = pgdata->node_zones +
- zone_for_memory(nid, start, size, ZONE_HIGHMEM, for_device);
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- return __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
+ return __add_pages(nid, start_pfn, nr_pages, !for_device);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 53eeb01b7888..f07c850efa30 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -682,22 +682,15 @@ static void update_end_of_memory_vars(u64 start, u64 size)
}
}
-/*
- * Memory is added always to NORMAL zone. This means you will never get
- * additional DMA/DMA32 memory.
- */
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
- struct pglist_data *pgdat = NODE_DATA(nid);
- struct zone *zone = pgdat->node_zones +
- zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
init_memory_mapping(start, start + size);
- ret = __add_pages(nid, zone, start_pfn, nr_pages, !for_device);
+ ret = __add_pages(nid, start_pfn, nr_pages, !for_device);
WARN_ON_ONCE(ret);
/* update max_pfn, max_low_pfn and high_memory */
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index ea838f8114b4..5ae81617f11d 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -392,39 +392,43 @@ static ssize_t show_valid_zones(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem = to_memory_block(dev);
- unsigned long start_pfn, end_pfn;
- unsigned long valid_start, valid_end, valid_pages;
+ unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
- struct zone *zone;
- int zone_shift = 0;
+ unsigned long valid_start_pfn, valid_end_pfn;
+ bool append = false;
+ int nid;
- start_pfn = section_nr_to_pfn(mem->start_section_nr);
- end_pfn = start_pfn + nr_pages;
-
- /* The block contains more than one zone can not be offlined. */
- if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end))
+ /*
+ * The block contains more than one zone can not be offlined.
+ * This can happen e.g. for ZONE_DMA and ZONE_DMA32
+ */
+ if (!test_pages_in_a_zone(start_pfn, start_pfn + nr_pages, &valid_start_pfn, &valid_end_pfn))
return sprintf(buf, "none\n");
- zone = page_zone(pfn_to_page(valid_start));
- valid_pages = valid_end - valid_start;
-
- /* MMOP_ONLINE_KEEP */
- sprintf(buf, "%s", zone->name);
+ start_pfn = valid_start_pfn;
+ nr_pages = valid_end_pfn - start_pfn;
- /* MMOP_ONLINE_KERNEL */
- zone_can_shift(valid_start, valid_pages, ZONE_NORMAL, &zone_shift);
- if (zone_shift) {
- strcat(buf, " ");
- strcat(buf, (zone + zone_shift)->name);
+ /*
+ * Check the existing zone. Make sure that we do that only on the
+ * online nodes otherwise the page_zone is not reliable
+ */
+ if (mem->state == MEM_ONLINE) {
+ strcat(buf, page_zone(pfn_to_page(start_pfn))->name);
+ goto out;
}
- /* MMOP_ONLINE_MOVABLE */
- zone_can_shift(valid_start, valid_pages, ZONE_MOVABLE, &zone_shift);
- if (zone_shift) {
- strcat(buf, " ");
- strcat(buf, (zone + zone_shift)->name);
+ nid = pfn_to_nid(start_pfn);
+ if (allow_online_pfn_range(nid, start_pfn, nr_pages, MMOP_ONLINE_KERNEL)) {
+ strcat(buf, NODE_DATA(nid)->node_zones[ZONE_NORMAL].name);
+ append = true;
}
+ if (allow_online_pfn_range(nid, start_pfn, nr_pages, MMOP_ONLINE_MOVABLE)) {
+ if (append)
+ strcat(buf, " ");
+ strcat(buf, NODE_DATA(nid)->node_zones[ZONE_MOVABLE].name);
+ }
+out:
strcat(buf, "\n");
return strlen(buf);
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index fc1c873504eb..9cd76ff7b0c5 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -122,8 +122,8 @@ extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
unsigned long nr_pages);
#endif /* CONFIG_MEMORY_HOTREMOVE */
-/* reasonably generic interface to expand the physical pages in a zone */
-extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
+/* reasonably generic interface to expand the physical pages */
+extern int __add_pages(int nid, unsigned long start_pfn,
unsigned long nr_pages, bool want_memblock);
#ifdef CONFIG_NUMA
@@ -298,15 +298,16 @@ extern int add_memory_resource(int nid, struct resource *resource, bool online);
extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
bool for_device);
extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
+extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
+ unsigned long nr_pages);
extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
extern bool is_memblock_offlined(struct memory_block *mem);
extern void remove_memory(int nid, u64 start, u64 size);
-extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
+extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
unsigned long map_offset);
extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
unsigned long pnum);
-extern bool zone_can_shift(unsigned long pfn, unsigned long nr_pages,
- enum zone_type target, int *zone_shift);
-
+extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
+ int online_type);
#endif /* __LINUX_MEMORY_HOTPLUG_H */
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index aa8cc03287b0..c412e6a3a1e9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -533,6 +533,26 @@ static inline bool zone_is_empty(struct zone *zone)
}
/*
+ * Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty
+ * intersection with the given zone
+ */
+static inline bool zone_intersects(struct zone *zone,
+ unsigned long start_pfn, unsigned long nr_pages)
+{
+ if (zone_is_empty(zone))
+ return false;
+ if (start_pfn >= zone_end_pfn(zone))
+ return false;
+
+ if (zone->zone_start_pfn <= start_pfn)
+ return true;
+ if (start_pfn + nr_pages > zone->zone_start_pfn)
+ return true;
+
+ return false;
+}
+
+/*
* The "priority" of VM scanning is how much of the queues we will scan in one
* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
* queues ("queue_length >> 12") during an aging round.
diff --git a/kernel/memremap.c b/kernel/memremap.c
index 07e85e5229da..61aaa41f4e18 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -364,6 +364,10 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
mem_hotplug_begin();
error = arch_add_memory(nid, align_start, align_size, true);
+ if (!error)
+ move_pfn_range_to_zone(&NODE_DATA(nid)->node_zones[ZONE_DEVICE],
+ align_start >> PAGE_SHIFT,
+ align_size >> PAGE_SHIFT);
mem_hotplug_done();
if (error)
goto err_add_memory;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 98f565c279bf..64b5b5b191a0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -433,25 +433,6 @@ static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
return -1;
}
-static struct zone * __meminit move_pfn_range(int zone_shift,
- unsigned long start_pfn, unsigned long end_pfn)
-{
- struct zone *zone = page_zone(pfn_to_page(start_pfn));
- int ret = 0;
-
- if (zone_shift < 0)
- ret = move_pfn_range_left(zone + zone_shift, zone,
- start_pfn, end_pfn);
- else if (zone_shift)
- ret = move_pfn_range_right(zone, zone + zone_shift,
- start_pfn, end_pfn);
-
- if (ret)
- return NULL;
-
- return zone + zone_shift;
-}
-
static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
unsigned long end_pfn)
{
@@ -493,23 +474,35 @@ static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
return 0;
}
-static int __meminit __add_section(int nid, struct zone *zone,
- unsigned long phys_start_pfn, bool want_memblock)
+static int __meminit __add_section(int nid, unsigned long phys_start_pfn,
+ bool want_memblock)
{
int ret;
+ int i;
if (pfn_valid(phys_start_pfn))
return -EEXIST;
- ret = sparse_add_one_section(zone, phys_start_pfn);
-
+ ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn);
if (ret < 0)
return ret;
- ret = __add_zone(zone, phys_start_pfn);
+ /*
+ * Make all the pages reserved so that nobody will stumble over half
+ * initialized state.
+ * FIXME: We also have to associate it with a node because pfn_to_node
+ * relies on having page with the proper node.
+ */
+ for (i = 0; i < PAGES_PER_SECTION; i++) {
+ unsigned long pfn = phys_start_pfn + i;
+ struct page *page;
+ if (!pfn_valid(pfn))
+ continue;
- if (ret < 0)
- return ret;
+ page = pfn_to_page(pfn);
+ set_page_node(page, nid);
+ SetPageReserved(page);
+ }
if (!want_memblock)
return 0;
@@ -523,7 +516,7 @@ static int __meminit __add_section(int nid, struct zone *zone,
* call this function after deciding the zone to which to
* add the new pages.
*/
-int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
+int __ref __add_pages(int nid, unsigned long phys_start_pfn,
unsigned long nr_pages, bool want_memblock)
{
unsigned long i;
@@ -531,8 +524,6 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
int start_sec, end_sec;
struct vmem_altmap *altmap;
- clear_zone_contiguous(zone);
-
/* during initialize mem_map, align hot-added range to section */
start_sec = pfn_to_section_nr(phys_start_pfn);
end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
@@ -552,7 +543,7 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
}
for (i = start_sec; i <= end_sec; i++) {
- err = __add_section(nid, zone, section_nr_to_pfn(i), want_memblock);
+ err = __add_section(nid, section_nr_to_pfn(i), want_memblock);
/*
* EEXIST is finally dealt with by ioresource collision
@@ -565,7 +556,6 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
}
vmemmap_populate_print_last();
out:
- set_zone_contiguous(zone);
return err;
}
EXPORT_SYMBOL_GPL(__add_pages);
@@ -1033,39 +1023,114 @@ static void node_states_set_node(int node, struct memory_notify *arg)
node_set_state(node, N_MEMORY);
}
-bool zone_can_shift(unsigned long pfn, unsigned long nr_pages,
- enum zone_type target, int *zone_shift)
+bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, int online_type)
{
- struct zone *zone = page_zone(pfn_to_page(pfn));
- enum zone_type idx = zone_idx(zone);
- int i;
+ struct pglist_data *pgdat = NODE_DATA(nid);
+ struct zone *movable_zone = &pgdat->node_zones[ZONE_MOVABLE];
+ struct zone *normal_zone = &pgdat->node_zones[ZONE_NORMAL];
- *zone_shift = 0;
+ /*
+ * TODO there shouldn't be any inherent reason to have ZONE_NORMAL
+ * physically before ZONE_MOVABLE. All we need is they do not
+ * overlap. Historically we didn't allow ZONE_NORMAL after ZONE_MOVABLE
+ * though so let's stick with it for simplicity for now.
+ * TODO make sure we do not overlap with ZONE_DEVICE
+ */
+ if (online_type == MMOP_ONLINE_KERNEL) {
+ if (zone_is_empty(movable_zone))
+ return true;
+ return movable_zone->zone_start_pfn >= pfn + nr_pages;
+ } else if (online_type == MMOP_ONLINE_MOVABLE) {
+ return zone_end_pfn(normal_zone) <= pfn;
+ }
- if (idx < target) {
- /* pages must be at end of current zone */
- if (pfn + nr_pages != zone_end_pfn(zone))
- return false;
+ /* MMOP_ONLINE_KEEP will always succeed and inherits the current zone */
+ return online_type == MMOP_ONLINE_KEEP;
+}
+
+static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn,
+ unsigned long nr_pages)
+{
+ unsigned long old_end_pfn = zone_end_pfn(zone);
+
+ if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn)
+ zone->zone_start_pfn = start_pfn;
+
+ zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn;
+}
+
+static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn,
+ unsigned long nr_pages)
+{
+ unsigned long old_end_pfn = pgdat_end_pfn(pgdat);
- /* no zones in use between current zone and target */
- for (i = idx + 1; i < target; i++)
- if (zone_is_initialized(zone - idx + i))
- return false;
+ if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
+ pgdat->node_start_pfn = start_pfn;
+
+ pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn;
+}
+
+void move_pfn_range_to_zone(struct zone *zone,
+ unsigned long start_pfn, unsigned long nr_pages)
+{
+ struct pglist_data *pgdat = zone->zone_pgdat;
+ int nid = pgdat->node_id;
+ unsigned long flags;
+ unsigned long i;
+
+ if (zone_is_empty(zone))
+ init_currently_empty_zone(zone, start_pfn, nr_pages);
+
+ clear_zone_contiguous(zone);
+
+ /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */
+ pgdat_resize_lock(pgdat, &flags);
+ zone_span_writelock(zone);
+ resize_zone_range(zone, start_pfn, nr_pages);
+ zone_span_writeunlock(zone);
+ resize_pgdat_range(pgdat, start_pfn, nr_pages);
+ pgdat_resize_unlock(pgdat, &flags);
+
+ /*
+ * TODO now we have a visible range of pages which are not associated
+ * with their zone properly. Not nice but set_pfnblock_flags_mask
+ * expects the zone spans the pfn range. All the pages in the range
+ * are reserved so nobody should be touching them so we should be safe
+ */
+ memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, MEMMAP_HOTPLUG);
+ for (i = 0; i < nr_pages; i++) {
+ unsigned long pfn = start_pfn + i;
+ set_page_links(pfn_to_page(pfn), zone_idx(zone), nid, pfn);
}
- if (target < idx) {
- /* pages must be at beginning of current zone */
- if (pfn != zone->zone_start_pfn)
- return false;
+ set_zone_contiguous(zone);
+}
+
+/*
+ * Associates the given pfn range with the given node and the zone appropriate
+ * for the given online type.
+ */
+static struct zone * __meminit move_pfn_range(int online_type, int nid,
+ unsigned long start_pfn, unsigned long nr_pages)
+{
+ struct pglist_data *pgdat = NODE_DATA(nid);
+ struct zone *zone = &pgdat->node_zones[ZONE_NORMAL];
- /* no zones in use between current zone and target */
- for (i = target + 1; i < idx; i++)
- if (zone_is_initialized(zone - idx + i))
- return false;
+ if (online_type == MMOP_ONLINE_KEEP) {
+ struct zone *movable_zone = &pgdat->node_zones[ZONE_MOVABLE];
+ /*
+ * MMOP_ONLINE_KEEP inherits the current zone which is
+ * ZONE_NORMAL by default but we might be within ZONE_MOVABLE
+ * already.
+ */
+ if (zone_intersects(movable_zone, start_pfn, nr_pages))
+ zone = movable_zone;
+ } else if (online_type == MMOP_ONLINE_MOVABLE) {
+ zone = &pgdat->node_zones[ZONE_MOVABLE];
}
- *zone_shift = target - idx;
- return true;
+ move_pfn_range_to_zone(zone, start_pfn, nr_pages);
+ return zone;
}
/* Must be protected by mem_hotplug_begin() */
@@ -1078,38 +1143,21 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
int nid;
int ret;
struct memory_notify arg;
- int zone_shift = 0;
- /*
- * This doesn't need a lock to do pfn_to_page().
- * The section can't be removed here because of the
- * memory_block->state_mutex.
- */
- zone = page_zone(pfn_to_page(pfn));
-
- if ((zone_idx(zone) > ZONE_NORMAL ||
- online_type == MMOP_ONLINE_MOVABLE) &&
- !can_online_high_movable(pfn_to_nid(pfn)))
+ nid = pfn_to_nid(pfn);
+ if (!allow_online_pfn_range(nid, pfn, nr_pages, online_type))
return -EINVAL;
- if (online_type == MMOP_ONLINE_KERNEL) {
- if (!zone_can_shift(pfn, nr_pages, ZONE_NORMAL, &zone_shift))
- return -EINVAL;
- } else if (online_type == MMOP_ONLINE_MOVABLE) {
- if (!zone_can_shift(pfn, nr_pages, ZONE_MOVABLE, &zone_shift))
- return -EINVAL;
- }
-
- zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages);
- if (!zone)
+ if (online_type == MMOP_ONLINE_MOVABLE && !can_online_high_movable(nid))
return -EINVAL;
+ /* associate pfn range with the zone */
+ zone = move_pfn_range(online_type, nid, pfn, nr_pages);
+
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
node_states_check_changes_online(nr_pages, zone, &arg);
- nid = zone_to_nid(zone);
-
ret = memory_notify(MEM_GOING_ONLINE, &arg);
ret = notifier_to_errno(ret);
if (ret)
diff --git a/mm/sparse.c b/mm/sparse.c
index 79017f90d8fc..ea6d03a52858 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -729,10 +729,9 @@ static void free_map_bootmem(struct page *memmap)
* set. If this is <=0, then that means that the passed-in
* map was not consumed and must be freed.
*/
-int __meminit sparse_add_one_section(struct zone *zone, unsigned long start_pfn)
+int __meminit sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn)
{
unsigned long section_nr = pfn_to_section_nr(start_pfn);
- struct pglist_data *pgdat = zone->zone_pgdat;
struct mem_section *ms;
struct page *memmap;
unsigned long *usemap;
--
2.11.0
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| From | Michal Hocko <mhocko@kernel.org> |
|---|---|
| Date | 2017-04-21 15:00 +0200 |
| Subject | Re: [PATCH 10/13] mm, memory_hotplug: do not associate hotadded memory to zones until online |
| Message-ID | <tyGkh-5UE-1@gated-at.bofh.it> |
| In reply to | #1628207 |
In case you were wondering about the weird sorting. git send-email has failed while at patch10 so I had to repost it and so the patch is out of order. It should be still applied as 10th patch. -- Michal Hocko SUSE Labs
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