linux-kernel - [vfs] 662aa027bda: -7.2% will-it-scale.scalability

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Date:	Tue, 27 May 2014 23:58:44 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Miklos Szeredi <mszeredi@...e.cz>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [vfs] 662aa027bda: -7.2% will-it-scale.scalability

Hi Miklos,

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs.v22
commit 662aa027bdaa082aa3dd21886830c97a1dd4c184 ("vfs: add RENAME_WHITEOUT")

test case: lkp-wsx01/will-it-scale/lseek2

9f498c77b4332b4  662aa027bdaa082aa3dd21886
---------------  -------------------------
      0.63 ~ 0%      -7.2%       0.58 ~ 0%  TOTAL will-it-scale.scalability
  12861563 ~ 0%      -1.1%   12715565 ~ 0%  TOTAL will-it-scale.per_process_ops
       958 ~11%     -16.9%        796 ~18%  TOTAL numa-meminfo.node3.PageTables
      3013 ~11%     +20.9%       3643 ~ 4%  TOTAL numa-vmstat.node2.nr_slab_reclaimable
     12055 ~11%     +20.9%      14574 ~ 4%  TOTAL numa-meminfo.node2.SReclaimable
      1734 ~ 5%     -10.6%       1550 ~ 4%  TOTAL slabinfo.sock_inode_cache.active_objs
      1734 ~ 5%     -10.6%       1550 ~ 4%  TOTAL slabinfo.sock_inode_cache.num_objs

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


                             will-it-scale.scalability

  0.63 ++----*---------*--------------*---*--------------*--*--*------------+
       | .*.    *...*.    *..*..*..  +     :         .*.           *..*     |
  0.62 *+                           +       :   *..*.                       |
       |                           *        : ..                            |
       |                                     *                              |
  0.61 ++                                                                   |
       |                                                                    |
   0.6 ++                                                                   |
       |                                                                    |
  0.59 ++                                                                   |
       |                           O      O                 O               |
       |            O     O  O  O     O      O  O  O  O  O     O   O     O  O
  0.58 O+    O  O      O                                              O     |
       |  O                                                                 |
  0.57 ++-------------------------------------------------------------------+


	[*] bisect-good sample
	[O] bisect-bad  sample


Thanks,
Jet



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