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lowmemorykiller: avoid false adaptive LMK triggers

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In vmpressure notifier of LMK, shift_adj would have been set
by a previous invocation of notifier, which is not followed by
a lowmem_shrink yet. If this is follwed by a lower vmpressure,
and then by a lowmem_shrink, ALMK still triggers because of the
previous higher vmpressure notification. This is wrong.
Since vmpressure has improved, reset shift_adj to avoid false
adaptive LMK trigger.

CRs-fixed: 893699
Change-Id: I2d77103d7c8f4d8a66e4652cba78e619a7bcef9a
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Vinayak Menon 2015-08-19 16:11:04 +05:30 committed by Gerrit - the friendly Code Review server
parent 2df937f43e
commit deafbd6437
1 changed files with 9 additions and 0 deletions
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9
drivers/staging/android/lowmemorykiller.c
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@ -162,6 +162,15 @@ static int lmk_vmpressure_notifier(struct notifier_block *nb,
trace_almk_vmpressure(pressure, other_free,
other_file);
}
} else if (atomic_read(&shift_adj)) {
/*
* shift_adj would have been set by a previous invocation
* of notifier, which is not followed by a lowmem_shrink yet.
* Since vmpressure has improved, reset shift_adj to avoid
* false adaptive LMK trigger.
*/
trace_almk_vmpressure(pressure, other_free, other_file);
atomic_set(&shift_adj, 0);
}
return 0;