linux-kernel - [LKP] [mm] b72fd1470c9: -41.7% perf-profile.cpu-cycles.get_page_from_freelist.__alloc_pages_nodemask.alloc_pages_current.__page_cache_alloc.pagecache_get

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Date:	Thu, 31 Jul 2014 13:50:35 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [LKP] [mm] b72fd1470c9: -41.7%
 perf-profile.cpu-cycles.get_page_from_freelist.__alloc_pages_nodemask.alloc_pages_current.__page_cache_alloc.pagecache_get_page

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit b72fd1470c9735f53485d089aa918dc327a86077 ("mm: rearrange zone fields into read-only, page alloc, statistics and page reclaim lines")

test case: lkp-st02/dd-write/5m-11HDD-JBOD-cfq-xfs-10dd

e28c951ff01a805  b72fd1470c9735f53485d089a  
---------------  -------------------------  
      1.06 ~ 6%     -41.7%       0.62 ~ 3%  TOTAL perf-profile.cpu-cycles.get_page_from_freelist.__alloc_pages_nodemask.alloc_pages_current.__page_cache_alloc.pagecache_get_page
      1.34 ~ 2%     -19.8%       1.07 ~ 2%  TOTAL perf-profile.cpu-cycles.__block_write_begin.xfs_vm_write_begin.generic_perform_write.xfs_file_buffered_aio_write.xfs_file_write_iter
      1.19 ~ 5%     -12.1%       1.05 ~ 4%  TOTAL perf-profile.cpu-cycles.copy_from_user_atomic_iovec.iov_iter_copy_from_user_atomic.generic_perform_write.xfs_file_buffered_aio_write.xfs_file_write_iter
      2.78 ~ 1%     -16.3%       2.32 ~ 4%  TOTAL perf-profile.cpu-cycles.__clear_user.read_zero.read_zero.vfs_read.sys_read
  2.96e+09 ~ 4%      -5.2%  2.806e+09 ~ 0%  TOTAL perf-stat.cache-misses
  3.86e+12 ~ 5%      -5.2%  3.658e+12 ~ 1%  TOTAL perf-stat.ref-cycles

Legend:
	~XX%    - stddev percent
	[+-]XX% - change percent



Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.

Thanks,
Aaron

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