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lmkd: choose the heaviest task when killing perceptible processes 

When killing a task at or lower than oom_score_adj PERCEPTIBLE_APP_ADJ
choose the heaviest task among the ones at that level to try minimizing
the number of required kills. Because killing a perceptible app will
affect user experience anyway, it makes sense to choose the one that
will release the most memory and therefore no more kills might be
necessary.

Bug: 181778155
Test: running thrashing.py script
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Merged-In: I775ff774430b6fde4d619ede794825dbae59fd8e
Change-Id: I775ff774430b6fde4d619ede794825dbae59fd8e
This commit is contained in:
Suren Baghdasaryan 2021-03-03 11:05:09 -08:00 committed by Martin Liu
parent 140385d3a0
commit 720abce177
1 changed files with 10 additions and 1 deletions
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11
lmkd.cpp
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@ -2153,12 +2153,21 @@ static int find_and_kill_process(int min_score_adj, enum kill_reasons kill_reaso
int i;
int killed_size = 0;
bool lmk_state_change_start = false;
bool choose_heaviest_task = kill_heaviest_task;
for (i = OOM_SCORE_ADJ_MAX; i >= min_score_adj; i--) {
struct proc *procp;
if (!choose_heaviest_task && i <= PERCEPTIBLE_APP_ADJ) {
/*
* If we have to choose a perceptible process, choose the heaviest one to
* hopefully minimize the number of victims.
*/
choose_heaviest_task = true;
}
while (true) {
procp = kill_heaviest_task ?
procp = choose_heaviest_task ?
proc_get_heaviest(i) : proc_adj_lru(i);
if (!procp)