Commit 67b5c799 authored by Vinayak Menon's avatar Vinayak Menon Committed by Greg Kroah-Hartman

mm: vmpressure: fix sending wrong events on underflow

commit e1587a49 upstream.

At the end of a window period, if the reclaimed pages is greater than
scanned, an unsigned underflow can result in a huge pressure value and
thus a critical event.  Reclaimed pages is found to go higher than
scanned because of the addition of reclaimed slab pages to reclaimed in
shrink_node without a corresponding increment to scanned pages.

Minchan Kim mentioned that this can also happen in the case of a THP
page where the scanned is 1 and reclaimed could be 512.

Link: http://lkml.kernel.org/r/1486641577-11685-1-git-send-email-vinmenon@codeaurora.orgSigned-off-by: default avatarVinayak Menon <vinmenon@codeaurora.org>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Shiraz Hashim <shashim@codeaurora.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6fd7a425
...@@ -112,8 +112,15 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned, ...@@ -112,8 +112,15 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long reclaimed) unsigned long reclaimed)
{ {
unsigned long scale = scanned + reclaimed; unsigned long scale = scanned + reclaimed;
unsigned long pressure; unsigned long pressure = 0;
/*
* reclaimed can be greater than scanned in cases
* like THP, where the scanned is 1 and reclaimed
* could be 512
*/
if (reclaimed >= scanned)
goto out;
/* /*
* We calculate the ratio (in percents) of how many pages were * We calculate the ratio (in percents) of how many pages were
* scanned vs. reclaimed in a given time frame (window). Note that * scanned vs. reclaimed in a given time frame (window). Note that
...@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned, ...@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
pressure = scale - (reclaimed * scale / scanned); pressure = scale - (reclaimed * scale / scanned);
pressure = pressure * 100 / scale; pressure = pressure * 100 / scale;
out:
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure, pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
scanned, reclaimed); scanned, reclaimed);
......
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