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Groups > linux.kernel > #1379573
| From | Mel Gorman <mgorman@techsingularity.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 07/28] mm, page_alloc: Avoid unnecessary zone lookups during pageblock operations |
| Date | 2016-04-15 11:10 +0200 |
| Message-ID | <ro7Vh-Er-27@gated-at.bofh.it> (permalink) |
| References | <ro7LB-hc-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Pageblocks have an associated bitmap to store migrate types and whether
the pageblock should be skipped during compaction. The bitmap may be
associated with a memory section or a zone but the zone is looked up
unconditionally. The compiler should optimise this away automatically so
this is a cosmetic patch only in many cases.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
mm/page_alloc.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ab16560b76e6..d00847bb1612 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6759,23 +6759,23 @@ void *__init alloc_large_system_hash(const char *tablename,
}
/* Return a pointer to the bitmap storing bits affecting a block of pages */
-static inline unsigned long *get_pageblock_bitmap(struct zone *zone,
+static inline unsigned long *get_pageblock_bitmap(struct page *page,
unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
return __pfn_to_section(pfn)->pageblock_flags;
#else
- return zone->pageblock_flags;
+ return page_zone(page)->pageblock_flags;
#endif /* CONFIG_SPARSEMEM */
}
-static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn)
+static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
pfn &= (PAGES_PER_SECTION-1);
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#else
- pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages);
+ pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages);
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#endif /* CONFIG_SPARSEMEM */
}
@@ -6793,14 +6793,12 @@ unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn,
unsigned long end_bitidx,
unsigned long mask)
{
- struct zone *zone;
unsigned long *bitmap;
unsigned long bitidx, word_bitidx;
unsigned long word;
- zone = page_zone(page);
- bitmap = get_pageblock_bitmap(zone, pfn);
- bitidx = pfn_to_bitidx(zone, pfn);
+ bitmap = get_pageblock_bitmap(page, pfn);
+ bitidx = pfn_to_bitidx(page, pfn);
word_bitidx = bitidx / BITS_PER_LONG;
bitidx &= (BITS_PER_LONG-1);
@@ -6822,20 +6820,18 @@ void set_pfnblock_flags_mask(struct page *page, unsigned long flags,
unsigned long end_bitidx,
unsigned long mask)
{
- struct zone *zone;
unsigned long *bitmap;
unsigned long bitidx, word_bitidx;
unsigned long old_word, word;
BUILD_BUG_ON(NR_PAGEBLOCK_BITS != 4);
- zone = page_zone(page);
- bitmap = get_pageblock_bitmap(zone, pfn);
- bitidx = pfn_to_bitidx(zone, pfn);
+ bitmap = get_pageblock_bitmap(page, pfn);
+ bitidx = pfn_to_bitidx(page, pfn);
word_bitidx = bitidx / BITS_PER_LONG;
bitidx &= (BITS_PER_LONG-1);
- VM_BUG_ON_PAGE(!zone_spans_pfn(zone, pfn), page);
+ VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn), page);
bitidx += end_bitidx;
mask <<= (BITS_PER_LONG - bitidx - 1);
--
2.6.4
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[PATCH 00/28] Optimise page alloc/free fast paths v3 Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:00 +0200
[PATCH 01/28] mm, page_alloc: Only check PageCompound for high-order pages Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:00 +0200
Re: [PATCH 01/28] mm, page_alloc: Only check PageCompound for high-order pages Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 11:40 +0200
Re: [PATCH 01/28] mm, page_alloc: Only check PageCompound for high-order pages Mel Gorman <mgorman@techsingularity.net> - 2016-04-26 12:40 +0200
Re: [PATCH 01/28] mm, page_alloc: Only check PageCompound for high-order pages Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:30 +0200
[PATCH 21/28] mm, page_alloc: Avoid looking up the first zone in a zonelist twice Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 21/28] mm, page_alloc: Avoid looking up the first zone in a zonelist twice Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 19:50 +0200
[PATCH 04/28] mm, page_alloc: Inline zone_statistics Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 04/28] mm, page_alloc: Inline zone_statistics Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 13:20 +0200
[PATCH 15/28] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 15/28] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 15:50 +0200
Re: [PATCH 15/28] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Mel Gorman <mgorman@techsingularity.net> - 2016-04-26 17:00 +0200
Re: [PATCH 15/28] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 17:20 +0200
Re: [PATCH 15/28] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Mel Gorman <mgorman@techsingularity.net> - 2016-04-26 18:30 +0200
[PATCH 19/28] mm, page_alloc: Reduce cost of fair zone allocation policy retry Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 13/28] mm, page_alloc: Remove redundant check for empty zonelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 22/28] mm, page_alloc: Remove field from alloc_context Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 14/28] mm, page_alloc: Simplify last cpupid reset Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 14/28] mm, page_alloc: Simplify last cpupid reset Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 15:40 +0200
[PATCH 20/28] mm, page_alloc: Shortcut watermark checks for order-0 pages Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 16/28] mm, page_alloc: Move __GFP_HARDWALL modifications out of the fastpath Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 16/28] mm, page_alloc: Move __GFP_HARDWALL modifications out of the fastpath Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 16:20 +0200
[PATCH 17/28] mm, page_alloc: Check once if a zone has isolated pageblocks Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 17/28] mm, page_alloc: Check once if a zone has isolated pageblocks Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 16:30 +0200
[PATCH 18/28] mm, page_alloc: Shorten the page allocator fast path Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 18/28] mm, page_alloc: Shorten the page allocator fast path Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 17:30 +0200
[PATCH 26/28] cpuset: use static key better and convert to new API Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
Re: [PATCH 26/28] cpuset: use static key better and convert to new API Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 22:00 +0200
[PATCH 27/28] mm, page_alloc: Defer debugging checks of freed pages until a PCP drain Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
Re: [PATCH 27/28] mm, page_alloc: Defer debugging checks of freed pages until a PCP drain Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 14:00 +0200
[PATCH 2/3] mm, page_alloc: pull out side effects from free_pages_check Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 14:10 +0200
Re: [PATCH 2/3] mm, page_alloc: pull out side effects from free_pages_check Mel Gorman <mgorman@techsingularity.net> - 2016-04-27 14:50 +0200
Re: [PATCH 2/3] mm, page_alloc: pull out side effects from free_pages_check Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 15:10 +0200
[PATCH 3/3] mm, page_alloc: don't duplicate code in free_pcp_prepare Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 14:10 +0200
[PATCH 1/3] mm, page_alloc: un-inline the bad part of free_pages_check Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 14:10 +0200
Re: [PATCH 1/3] mm, page_alloc: un-inline the bad part of free_pages_check Mel Gorman <mgorman@techsingularity.net> - 2016-04-27 14:40 +0200
Re: [PATCH 1/3] mm, page_alloc: un-inline the bad part of free_pages_check Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 15:00 +0200
[PATCH 25/28] mm, page_alloc: Inline pageblock lookup in page free fast paths Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
[PATCH 24/28] mm, page_alloc: Remove unnecessary variable from free_pcppages_bulk Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
[PATCH 23/28] mm, page_alloc: Check multiple page fields with a single branch Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
Re: [PATCH 23/28] mm, page_alloc: Check multiple page fields with a single branch Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 20:50 +0200
Re: [PATCH 23/28] mm, page_alloc: Check multiple page fields with a single branch Mel Gorman <mgorman@techsingularity.net> - 2016-04-27 12:10 +0200
[PATCH 28/28] mm, page_alloc: Defer debugging checks of pages allocated from the PCP Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:20 +0200
Re: [PATCH 28/28] mm, page_alloc: Defer debugging checks of pages allocated from the PCP Vlastimil Babka <vbabka@suse.cz> - 2016-04-27 16:10 +0200
Re: [PATCH 28/28] mm, page_alloc: Defer debugging checks of pages allocated from the PCP Mel Gorman <mgorman@techsingularity.net> - 2016-04-27 17:40 +0200
Re: [PATCH 13/28] mm, page_alloc: Remove redundant check for empty zonelist Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 14:10 +0200
Re: [PATCH 13/28] mm, page_alloc: Remove redundant check for empty zonelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-26 15:10 +0200
Re: [PATCH 13/28] mm, page_alloc: Remove redundant check for empty zonelist Andrew Morton <akpm@linux-foundation.org> - 2016-04-26 21:20 +0200
[PATCH 07/28] mm, page_alloc: Avoid unnecessary zone lookups during pageblock operations Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 07/28] mm, page_alloc: Avoid unnecessary zone lookups during pageblock operations Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:30 +0200
[PATCH 02/28] mm, page_alloc: Use new PageAnonHead helper in the free page fast path Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 02/28] mm, page_alloc: Use new PageAnonHead helper in the free page fast path Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 12:00 +0200
[PATCH 11/28] mm, page_alloc: Remove unnecessary initialisation in get_page_from_freelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 06/28] mm, page_alloc: Use __dec_zone_state for order-0 page allocation Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 06/28] mm, page_alloc: Use __dec_zone_state for order-0 page allocation Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:30 +0200
[PATCH 09/28] mm, page_alloc: Convert nr_fair_skipped to bool Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 09/28] mm, page_alloc: Convert nr_fair_skipped to bool Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:40 +0200
[PATCH 08/28] mm, page_alloc: Convert alloc_flags to unsigned Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
[PATCH 03/28] mm, page_alloc: Reduce branches in zone_statistics Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 03/28] mm, page_alloc: Reduce branches in zone_statistics Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 13:20 +0200
[PATCH 05/28] mm, page_alloc: Inline the fast path of the zonelist iterator Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 05/28] mm, page_alloc: Inline the fast path of the zonelist iterator Vlastimil Babka <vbabka@suse.cz> - 2016-04-25 17:00 +0200
Re: [PATCH 05/28] mm, page_alloc: Inline the fast path of the zonelist iterator Mel Gorman <mgorman@techsingularity.net> - 2016-04-26 12:40 +0200
Re: [PATCH 05/28] mm, page_alloc: Inline the fast path of the zonelist iterator Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:10 +0200
[PATCH 10/28] mm, page_alloc: Remove unnecessary local variable in get_page_from_freelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 11:10 +0200
Re: [PATCH 10/28] mm, page_alloc: Remove unnecessary local variable in get_page_from_freelist Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:40 +0200
Re: [PATCH 00/28] Optimise page alloc/free fast paths v3 Jesper Dangaard Brouer <brouer@redhat.com> - 2016-04-15 14:50 +0200
Re: [PATCH 00/28] Optimise page alloc/free fast paths v3 Mel Gorman <mgorman@techsingularity.net> - 2016-04-15 15:10 +0200
[PATCH 12/28] mm, page_alloc: Remove unnecessary initialisation from __alloc_pages_nodemask() Mel Gorman <mgorman@techsingularity.net> - 2016-04-16 09:30 +0200
Re: [PATCH 12/28] mm, page_alloc: Remove unnecessary initialisation from __alloc_pages_nodemask() Vlastimil Babka <vbabka@suse.cz> - 2016-04-26 13:50 +0200
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