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mm: vmpressure: fix sending wrong events on underflow

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am: 66f43a5768

Change-Id: I914c9c65e90dc02251788277937daca32fd59818
This commit is contained in:
Vinayak Menon
2017-03-12 08:15:27 +00:00
committed by android-build-merger
parent 32125704fe 66f43a5768
commit 5cc4831e1b
1 changed files with 9 additions and 1 deletions
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10
mm/vmpressure.c
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@@ -112,8 +112,15 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
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
@@ -124,6 +131,7 @@ static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
pressure = scale - (reclaimed * scale / scanned);
pressure = pressure * 100 / scale;
out:
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
scanned, reclaimed);