Commit d7143e31 authored Jun 16, 2017 by zhongjiang Committed by Linus Torvalds Jun 17, 2017

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

Commit e1587a49 ("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>

parent 64c2b203

mm/vmpressure.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -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;

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