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Groups > linux.kernel > #1376640
| From | Mel Gorman <mgorman@techsingularity.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 14/24] mm, page_alloc: Simplify last cpupid reset |
| Date | 2016-04-12 12:20 +0200 |
| Message-ID | <rn3Ao-5K4-65@gated-at.bofh.it> (permalink) |
| References | <rn3Al-5K4-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
The current reset unnecessarily clears flags and makes pointless calculations.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
include/linux/mm.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ffcff53e3b2b..60656db00abd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -837,10 +837,7 @@ extern int page_cpupid_xchg_last(struct page *page, int cpupid);
static inline void page_cpupid_reset_last(struct page *page)
{
- int cpupid = (1 << LAST_CPUPID_SHIFT) - 1;
-
- page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT);
- page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT;
+ page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT;
}
#endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */
#else /* !CONFIG_NUMA_BALANCING */
--
2.6.4
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[PATCH 00/24] Optimise page alloc/free fast paths v2 Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 02/24] mm, page_alloc: Use new PageAnonHead helper in the free page fast path Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 18/24] mm, page_alloc: Shortcut watermark checks for order-0 pages Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 05/24] mm, page_alloc: Inline the fast path of the zonelist iterator Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 15/24] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 19/24] mm, page_alloc: Avoid looking up the first zone in a zonelist twice Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 14/24] mm, page_alloc: Simplify last cpupid reset Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 03/24] mm, page_alloc: Reduce branches in zone_statistics Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 22/24] mm, page_alloc: Check once if a zone has isolated pageblocks Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 21/24] cpuset: use static key better and convert to new API Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 11/24] mm, page_alloc: Remove unnecessary initialisation in get_page_from_freelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 24/24] mm, page_alloc: Do not lookup pcp migratetype during bulk free Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 13/24] mm, page_alloc: Remove redundant check for empty zonelist Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 23/24] mm, page_alloc: Remove unnecessary variable from free_pcppages_bulk Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 08/24] mm, page_alloc: Convert alloc_flags to unsigned Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:20 +0200 [PATCH 01/24] mm, page_alloc: Only check PageCompound for high-order pages Mel Gorman <mgorman@techsingularity.net> - 2016-04-12 12:30 +0200
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