The patch titled
Subject: mm: vmpressure: fix sending wrong events on underflow
has been added to the -mm tree. Its filename is
mm-vmpressure-fix-sending-wrong-events-on-underflow.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmpressure-fix-sending-wrong-events-on-underflow.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmpressure-fix-sending-wrong-events-on-underflow.patch
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------------------------------------------------------
From: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Subject: mm: vmpressure: fix sending wrong events on underflow
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@xxxxxxxxxxxxxx
Signed-off-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Anton Vorontsov <anton.vorontsov@xxxxxxxxxx>
Cc: Shiraz Hashim <shashim@xxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmpressure.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff -puN mm/vmpressure.c~mm-vmpressure-fix-sending-wrong-events-on-underflow mm/vmpressure.c
--- a/mm/vmpressure.c~mm-vmpressure-fix-sending-wrong-events-on-underflow
+++ a/mm/vmpressure.c
@@ -112,9 +112,16 @@ static enum vmpressure_levels vmpressure
unsigned long 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
* scanned vs. reclaimed in a given time frame (window). Note that
* time is in VM reclaimer's "ticks", i.e. number of pages
@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure
pressure = scale - (reclaimed * scale / scanned);
pressure = pressure * 100 / scale;
+out:
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
scanned, reclaimed);
_
Patches currently in -mm which might be from vinmenon@xxxxxxxxxxxxxx are
mm-vmpressure-fix-sending-wrong-events-on-underflow.patch
mm-vmscan-do-not-pass-reclaimed-slab-to-vmpressure.patch