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lmkd: Do not kill perceptible apps due to low swap if above min wmark 

Prevent kills of perceptible apps due to swap shortages unless system
free memory is below the min watermark. This prevents kills of important
apps when the system is recovering from the memory pressure.

Bug: 155709603
Test: memory stress test with multiple foreground apps
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I6beb4b55f8b4f7bc22818b5a7bdfa3adc6cd31c1
This commit is contained in:
Suren Baghdasaryan 2020-05-19 12:59:18 -07:00
parent fb1f592602
commit 48135c4cba
1 changed files with 8 additions and 0 deletions
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lmkd.cpp
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@ -2396,12 +2396,20 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
snprintf(kill_desc, sizeof(kill_desc), "device is low on swap (%" PRId64
"kB < %" PRId64 "kB) and thrashing (%" PRId64 "%%)",
mi.field.free_swap * page_k, swap_low_threshold * page_k, thrashing);
/* Do not kill perceptible apps unless below min watermark */
if (wmark < WMARK_LOW) {
min_score_adj = PERCEPTIBLE_APP_ADJ + 1;
}
} else if (swap_is_low && wmark < WMARK_HIGH) {
/* Both free memory and swap are low */
kill_reason = LOW_MEM_AND_SWAP;
snprintf(kill_desc, sizeof(kill_desc), "%s watermark is breached and swap is low (%"
PRId64 "kB < %" PRId64 "kB)", wmark > WMARK_LOW ? "min" : "low",
mi.field.free_swap * page_k, swap_low_threshold * page_k);
/* Do not kill perceptible apps unless below min watermark */
if (wmark < WMARK_LOW) {
min_score_adj = PERCEPTIBLE_APP_ADJ + 1;
}
} else if (wmark < WMARK_HIGH && swap_util_max < 100 &&
(swap_util = calc_swap_utilization(&mi)) > swap_util_max) {
/*