From: Mel Gorman <mgorman@techsingularity.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 14/24] mm, page_alloc: Simplify last cpupid reset
Date: Tue, 12 Apr 2016 11:12:15 +0100 [thread overview]
Message-ID: <1460455945-29644-15-git-send-email-mgorman@techsingularity.net> (raw)
In-Reply-To: <1460455945-29644-1-git-send-email-mgorman@techsingularity.net>
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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next prev parent reply other threads:[~2016-04-12 10:13 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-12 10:12 [PATCH 00/24] Optimise page alloc/free fast paths v2 Mel Gorman
2016-04-12 10:12 ` [PATCH 01/24] mm, page_alloc: Only check PageCompound for high-order pages Mel Gorman
2016-04-12 10:12 ` [PATCH 02/24] mm, page_alloc: Use new PageAnonHead helper in the free page fast path Mel Gorman
2016-04-12 10:12 ` [PATCH 03/24] mm, page_alloc: Reduce branches in zone_statistics Mel Gorman
2016-04-12 10:12 ` [PATCH 04/24] mm, page_alloc: Inline zone_statistics Mel Gorman
2016-04-12 10:12 ` [PATCH 05/24] mm, page_alloc: Inline the fast path of the zonelist iterator Mel Gorman
2016-04-12 10:12 ` [PATCH 06/24] mm, page_alloc: Use __dec_zone_state for order-0 page allocation Mel Gorman
2016-04-12 10:12 ` [PATCH 07/24] mm, page_alloc: Avoid unnecessary zone lookups during pageblock operations Mel Gorman
2016-04-12 10:12 ` [PATCH 08/24] mm, page_alloc: Convert alloc_flags to unsigned Mel Gorman
2016-04-12 10:12 ` [PATCH 09/24] mm, page_alloc: Convert nr_fair_skipped to bool Mel Gorman
2016-04-12 10:12 ` [PATCH 10/24] mm, page_alloc: Remove unnecessary local variable in get_page_from_freelist Mel Gorman
2016-04-12 10:12 ` [PATCH 11/24] mm, page_alloc: Remove unnecessary initialisation " Mel Gorman
2016-04-12 10:12 ` [PATCH 12/24] mm, page_alloc: Remove unnecessary initialisation from __alloc_pages_nodemask() Mel Gorman
2016-04-12 10:12 ` [PATCH 13/24] mm, page_alloc: Remove redundant check for empty zonelist Mel Gorman
2016-04-12 10:12 ` Mel Gorman [this message]
2016-04-12 10:12 ` [PATCH 15/24] mm, page_alloc: Move might_sleep_if check to the allocator slowpath Mel Gorman
2016-04-12 10:12 ` [PATCH 16/24] mm, page_alloc: Move __GFP_HARDWALL modifications out of the fastpath Mel Gorman
2016-04-12 10:12 ` [PATCH 17/24] mm, page_alloc: Reduce cost of fair zone allocation policy retry Mel Gorman
2016-04-12 10:12 ` [PATCH 18/24] mm, page_alloc: Shortcut watermark checks for order-0 pages Mel Gorman
2016-04-12 10:12 ` [PATCH 19/24] mm, page_alloc: Avoid looking up the first zone in a zonelist twice Mel Gorman
2016-04-12 10:12 ` [PATCH 20/24] mm, page_alloc: Check multiple page fields with a single branch Mel Gorman
2016-04-12 10:12 ` [PATCH 21/24] cpuset: use static key better and convert to new API Mel Gorman
2016-04-12 10:12 ` [PATCH 22/24] mm, page_alloc: Check once if a zone has isolated pageblocks Mel Gorman
2016-04-12 10:12 ` [PATCH 23/24] mm, page_alloc: Remove unnecessary variable from free_pcppages_bulk Mel Gorman
2016-04-12 10:12 ` [PATCH 24/24] mm, page_alloc: Do not lookup pcp migratetype during bulk free Mel Gorman
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