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Groups > linux.kernel > #1438837
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 01/99] mm: migrate dirty page without clear_page_dirty_for_io etc |
| Date | 2016-07-07 20:50 +0200 |
| Message-ID | <rSmx5-2ew-67@gated-at.bofh.it> (permalink) |
| References | <rSmnn-2ax-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.19.8-ckt23 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Hugh Dickins <hughd@google.com>
commit 42cb14b110a5698ccf26ce59c4441722605a3743 upstream.
clear_page_dirty_for_io() has accumulated writeback and memcg subtleties
since v2.6.16 first introduced page migration; and the set_page_dirty()
which completed its migration of PageDirty, later had to be moderated to
__set_page_dirty_nobuffers(); then PageSwapBacked had to skip that too.
No actual problems seen with this procedure recently, but if you look into
what the clear_page_dirty_for_io(page)+set_page_dirty(newpage) is actually
achieving, it turns out to be nothing more than moving the PageDirty flag,
and its NR_FILE_DIRTY stat from one zone to another.
It would be good to avoid a pile of irrelevant decrementations and
incrementations, and improper event counting, and unnecessary descent of
the radix_tree under tree_lock (to set the PAGECACHE_TAG_DIRTY which
radix_tree_replace_slot() left in place anyway).
Do the NR_FILE_DIRTY movement, like the other stats movements, while
interrupts still disabled in migrate_page_move_mapping(); and don't even
bother if the zone is the same. Do the PageDirty movement there under
tree_lock too, where old page is frozen and newpage not yet visible:
bearing in mind that as soon as newpage becomes visible in radix_tree, an
un-page-locked set_page_dirty() might interfere (or perhaps that's just
not possible: anything doing so should already hold an additional
reference to the old page, preventing its migration; but play safe).
But we do still need to transfer PageDirty in migrate_page_copy(), for
those who don't go the mapping route through migrate_page_move_mapping().
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16: adjust context. This is not just an optimisation,
but turned out to fix a possible oops (CVE-2016-3070).]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
mm/migrate.c | 51 +++++++++++++++++++++++++++++++--------------------
1 file changed, 31 insertions(+), 20 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index be6d1ed..3d49e5d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -30,6 +30,7 @@
#include <linux/mempolicy.h>
#include <linux/vmalloc.h>
#include <linux/security.h>
+#include <linux/backing-dev.h>
#include <linux/memcontrol.h>
#include <linux/syscalls.h>
#include <linux/hugetlb.h>
@@ -342,6 +343,8 @@ int migrate_page_move_mapping(struct address_space *mapping,
struct buffer_head *head, enum migrate_mode mode,
int extra_count)
{
+ struct zone *oldzone, *newzone;
+ int dirty;
int expected_count = 1 + extra_count;
void **pslot;
@@ -352,6 +355,9 @@ int migrate_page_move_mapping(struct address_space *mapping,
return MIGRATEPAGE_SUCCESS;
}
+ oldzone = page_zone(page);
+ newzone = page_zone(newpage);
+
spin_lock_irq(&mapping->tree_lock);
pslot = radix_tree_lookup_slot(&mapping->page_tree,
@@ -392,6 +398,13 @@ int migrate_page_move_mapping(struct address_space *mapping,
set_page_private(newpage, page_private(page));
}
+ /* Move dirty while page refs frozen and newpage not yet exposed */
+ dirty = PageDirty(page);
+ if (dirty) {
+ ClearPageDirty(page);
+ SetPageDirty(newpage);
+ }
+
radix_tree_replace_slot(pslot, newpage);
/*
@@ -401,6 +414,9 @@ int migrate_page_move_mapping(struct address_space *mapping,
*/
page_unfreeze_refs(page, expected_count - 1);
+ spin_unlock(&mapping->tree_lock);
+ /* Leave irq disabled to prevent preemption while updating stats */
+
/*
* If moved to a different zone then also account
* the page for that zone. Other VM counters will be
@@ -411,13 +427,19 @@ int migrate_page_move_mapping(struct address_space *mapping,
* via NR_FILE_PAGES and NR_ANON_PAGES if they
* are mapped to swap space.
*/
- __dec_zone_page_state(page, NR_FILE_PAGES);
- __inc_zone_page_state(newpage, NR_FILE_PAGES);
- if (!PageSwapCache(page) && PageSwapBacked(page)) {
- __dec_zone_page_state(page, NR_SHMEM);
- __inc_zone_page_state(newpage, NR_SHMEM);
+ if (newzone != oldzone) {
+ __dec_zone_state(oldzone, NR_FILE_PAGES);
+ __inc_zone_state(newzone, NR_FILE_PAGES);
+ if (PageSwapBacked(page) && !PageSwapCache(page)) {
+ __dec_zone_state(oldzone, NR_SHMEM);
+ __inc_zone_state(newzone, NR_SHMEM);
+ }
+ if (dirty && mapping_cap_account_dirty(mapping)) {
+ __dec_zone_state(oldzone, NR_FILE_DIRTY);
+ __inc_zone_state(newzone, NR_FILE_DIRTY);
+ }
}
- spin_unlock_irq(&mapping->tree_lock);
+ local_irq_enable();
return MIGRATEPAGE_SUCCESS;
}
@@ -541,20 +563,9 @@ void migrate_page_copy(struct page *newpage, struct page *page)
if (PageMappedToDisk(page))
SetPageMappedToDisk(newpage);
- if (PageDirty(page)) {
- clear_page_dirty_for_io(page);
- /*
- * Want to mark the page and the radix tree as dirty, and
- * redo the accounting that clear_page_dirty_for_io undid,
- * but we can't use set_page_dirty because that function
- * is actually a signal that all of the page has become dirty.
- * Whereas only part of our page may be dirty.
- */
- if (PageSwapBacked(page))
- SetPageDirty(newpage);
- else
- __set_page_dirty_nobuffers(newpage);
- }
+ /* Move dirty on pages not done by migrate_page_move_mapping() */
+ if (PageDirty(page))
+ SetPageDirty(newpage);
/*
* Copy NUMA information to the new page, to prevent over-eager
--
2.7.4
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[PATCH 3.19.y-ckt 65/99] MIPS: math-emu: Fix jalr emulation when rd == $0 Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 85/99] PM / sleep: Handle failures in device_suspend_late() consistently Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 97/99] powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
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[PATCH 3.19.y-ckt 99/99] can: fix handling of unmodifiable configuration options fix Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 75/99] fs/cifs: correctly to anonymous authentication for the NTLM(v1) authentication Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 69/99] PCI: Disable all BAR sizing for devices with non-compliant BARs Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 36/99] ACPI / osi: Fix an issue that acpi_osi=!* cannot disable ACPICA internal strings Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
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[PATCH 3.19.y-ckt 80/99] xfs: fix inode validity check in xfs_iflush_cluster Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
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[PATCH 3.19.y-ckt 68/99] mmc: mmc: Fix partition switch timeout for some eMMCs Kamal Mostafa <kamal@canonical.com> - 2016-07-07 20:50 +0200
[PATCH 3.19.y-ckt 72/99] drm/fb_helper: Fix references to dev->mode_config.num_connector Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 53/99] USB: serial: quatech2: fix use-after-free in probe error path Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
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[PATCH 3.19.y-ckt 66/99] ring-buffer: Use long for nr_pages to avoid overflow failures Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 46/99] MIPS: Reserve nosave data for hibernation Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 59/99] arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 35/99] USB: serial: option: add even more ZTE device ids Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 58/99] irqchip/gic: Ensure ordering between read of INTACK and shared data Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 33/99] mcb: Fixed bar number assignment for the gdd Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 57/99] gcov: disable tree-loop-im to reduce stack usage Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 42/99] can: fix handling of unmodifiable configuration options Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 34/99] USB: serial: option: add more ZTE device ids Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 24/99] arm/arm64: KVM: Enforce Break-Before-Make on Stage-2 page tables Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 45/99] MIPS: Avoid using unwind_stack() with usermode Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 50/99] USB: serial: io_edgeport: fix memory leaks in probe error path Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 26/99] aacraid: Fix for aac_command_thread hang Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 54/99] crypto: caam - fix caam_jr_alloc() ret code Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 52/99] USB: serial: mxuport: fix use-after-free in probe error path Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 62/99] rtlwifi: pci: use dev_kfree_skb_irq instead of kfree_skb in rtl_pci_reset_trx_ring Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 67/99] ring-buffer: Prevent overflow of size in ring_buffer_resize() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 38/99] ext4: fix oops on corrupted filesystem Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 56/99] MIPS: KVM: Fix timer IRQ race when writing CP0_Compare Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 47/99] usb: host: xhci-rcar: Avoid long wait in xhci_reset() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 40/99] ext4: silence UBSAN in ext4_mb_init() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 61/99] rtlwifi: Fix logic error in enter/exit power-save mode Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 48/99] mfd: omap-usb-tll: Fix scheduling while atomic BUG Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 29/99] QE-UART: add "fsl,t1040-ucc-uart" to of_device_id Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 49/99] USB: serial: io_edgeport: fix memory leaks in attach error path Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 41/99] arm64: Ensure pmd_present() returns false after pmd_mknotpresent() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 30/99] thunderbolt: Fix double free of drom buffer Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 51/99] USB: serial: keyspan: fix use-after-free in probe error path Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 63/99] powerpc/eeh: Don't report error in eeh_pe_reset_and_recover() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 60/99] kbuild: move -Wunused-const-variable to W=1 warning level Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 39/99] ext4: address UBSAN warning in mb_find_order_for_block() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:00 +0200
[PATCH 3.19.y-ckt 09/99] cpuidle: Indicate when a device has been unregistered Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 20/99] pinctrl: exynos5440: Use off-stack memory for pinctrl_gpio_range Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 21/99] btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION} in btrfs_ioctl Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 18/99] ath9k: Add a module parameter to invert LED polarity. Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 28/99] MIPS: ath79: make bootconsole wait for both THRE and TEMT Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 16/99] PM / Runtime: Fix error path in pm_runtime_force_resume() Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 17/99] crypto: s5p-sss - Fix missed interrupts when working with 8 kB blocks Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 32/99] USB: leave LPM alone if possible when binding/unbinding interface drivers Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 12/99] Revert "scsi: fix soft lockup in scsi_remove_target() on module removal" Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 10/99] [media] media: v4l2-compat-ioctl32: fix missing reserved field copy in put_v4l2_create32 Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 23/99] TTY: n_gsm, fix false positive WARN_ON Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 25/99] aacraid: Relinquish CPU during timeout wait Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 22/99] usb: core: hub: hub_port_init lock controller instead of bus Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 14/99] Bluetooth: vhci: Fix race at creating hci device Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 37/99] USB: serial: cp210x: fix hardware flow-control disable Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 04/99] ath10k: fix debugfs pktlog_filter write Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 02/99] ath10k: fix firmware assert in monitor mode Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 19/99] ath9k: Fix LED polarity for some Mini PCI AR9220 MB92 cards. Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 11/99] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 15/99] powerpc/book3s64: Fix branching to OOL handlers in relocatable kernel Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 31/99] USB: serial: option: add support for Cinterion PH8 and AHxx Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 13/99] usb: f_mass_storage: test whether thread is running before starting another Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
[PATCH 3.19.y-ckt 27/99] ext4: fix hang when processing corrupted orphaned inode list Kamal Mostafa <kamal@canonical.com> - 2016-07-07 21:10 +0200
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