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mm: correct the comment when reclaimed pages exceed the scanned pages 

Commit e1587a4945 ("mm: vmpressure: fix sending wrong events on
underflow") declared that reclaimed pages exceed the scanned pages due
to the thp reclaim.

That is incorrect because THP will be spilt to normal page and loop
again, which will result in the scanned pages increment.

[akpm@linux-foundation.org: tweak comment text]
Link: http://lkml.kernel.org/r/1496824266-25235-1-git-send-email-zhongjiang@huawei.com
Signed-off-by: zhongjiang <zhongjiang@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
zhongjiang 2017-06-16 14:02:40 -07:00 committed by Linus Torvalds
parent 64c2b20301
commit d7143e3125
1 changed files with 3 additions and 3 deletions
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6
mm/vmpressure.c
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@ -115,9 +115,9 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long pressure = 0;
/*
* reclaimed can be greater than scanned in cases
* like THP, where the scanned is 1 and reclaimed
* could be 512
* reclaimed can be greater than scanned for things such as reclaimed
* slab pages. shrink_node() just adds reclaimed pages without a
* related increment to scanned pages.
*/
if (reclaimed >= scanned)
goto out;