diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-11-21 22:17:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-22 10:48:22 -0800 |
| commit | 66383800df9cbdbf3b0c34d5a51bf35bcdb72fd2 (patch) | |
| tree | 8172ec6d41fcdbd0af75ce75135f793b52ce5125 /fs | |
| parent | 488dac0c9237647e9b8f788b6a342595bfa40bda (diff) | |
mm: fix madvise WILLNEED performance problem
The calculation of the end page index was incorrect, leading to a
regression of 70% when running stress-ng.
With this fix, we instead see a performance improvement of 3%.
Fixes: e6e88712e43b ("mm: optimise madvise WILLNEED")
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Feng Tang <feng.tang@intel.com>
Cc: "Chen, Rong A" <rong.a.chen@intel.com>
Link: https://lkml.kernel.org/r/20201109134851.29692-1-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
0 files changed, 0 insertions, 0 deletions