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[PATCH 06/28] mm, page_alloc: Use __dec_zone_state for order-0 page allocation

From Mel Gorman <mgorman@techsingularity.net>
Newsgroups linux.kernel
Subject [PATCH 06/28] mm, page_alloc: Use __dec_zone_state for order-0 page allocation
Date 2016-04-15 11:10 +0200
Message-ID <ro7Vh-Er-33@gated-at.bofh.it> (permalink)
References <ro7LB-hc-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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__dec_zone_state is cheaper to use for removing an order-0 page as it
has fewer conditions to check.

The performance difference on a page allocator microbenchmark is;

                                           4.6.0-rc2                  4.6.0-rc2
                                       optiter-v1r20              decstat-v1r20
Min      alloc-odr0-1               382.00 (  0.00%)           381.00 (  0.26%)
Min      alloc-odr0-2               282.00 (  0.00%)           275.00 (  2.48%)
Min      alloc-odr0-4               233.00 (  0.00%)           229.00 (  1.72%)
Min      alloc-odr0-8               203.00 (  0.00%)           199.00 (  1.97%)
Min      alloc-odr0-16              188.00 (  0.00%)           186.00 (  1.06%)
Min      alloc-odr0-32              182.00 (  0.00%)           179.00 (  1.65%)
Min      alloc-odr0-64              177.00 (  0.00%)           174.00 (  1.69%)
Min      alloc-odr0-128             175.00 (  0.00%)           172.00 (  1.71%)
Min      alloc-odr0-256             184.00 (  0.00%)           181.00 (  1.63%)
Min      alloc-odr0-512             197.00 (  0.00%)           193.00 (  2.03%)
Min      alloc-odr0-1024            203.00 (  0.00%)           201.00 (  0.99%)
Min      alloc-odr0-2048            209.00 (  0.00%)           206.00 (  1.44%)
Min      alloc-odr0-4096            214.00 (  0.00%)           212.00 (  0.93%)
Min      alloc-odr0-8192            218.00 (  0.00%)           215.00 (  1.38%)
Min      alloc-odr0-16384           219.00 (  0.00%)           216.00 (  1.37%)

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e9acc0b0f787..ab16560b76e6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2414,6 +2414,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
 		else
 			page = list_first_entry(list, struct page, lru);
 
+		__dec_zone_state(zone, NR_ALLOC_BATCH);
 		list_del(&page->lru);
 		pcp->count--;
 	} else {
@@ -2435,11 +2436,11 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
 		spin_unlock(&zone->lock);
 		if (!page)
 			goto failed;
+		__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
 		__mod_zone_freepage_state(zone, -(1 << order),
 					  get_pcppage_migratetype(page));
 	}
 
-	__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
 	if (atomic_long_read(&zone->vm_stat[NR_ALLOC_BATCH]) <= 0 &&
 	    !test_bit(ZONE_FAIR_DEPLETED, &zone->flags))
 		set_bit(ZONE_FAIR_DEPLETED, &zone->flags);
-- 
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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