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lmkd: avoid division by zero because of file_base_lru am: c3108416e7 

Original change: https://android-review.googlesource.com/c/platform/system/memory/lmkd/+/1418831

Change-Id: I828d0765ce5c1bbb15451c37a49bc0b9fc26795e
This commit is contained in:
Martin Liu 2020-09-03 16:40:55 +00:00 committed by Automerger Merge Worker
parent 58f6be8f3c c3108416e7
commit b1294d486f
1 changed files with 3 additions and 2 deletions
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lmkd.cpp
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@ -2422,7 +2422,8 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
if (since_thrashing_reset_ms > THRASHING_RESET_INTERVAL_MS) {
long windows_passed;
/* Calculate prev_thrash_growth if we crossed THRASHING_RESET_INTERVAL_MS */
prev_thrash_growth = (vs.field.workingset_refault - init_ws_refault) * 100 / base_file_lru;
prev_thrash_growth = (vs.field.workingset_refault - init_ws_refault) * 100
/ (base_file_lru + 1);
windows_passed = (since_thrashing_reset_ms / THRASHING_RESET_INTERVAL_MS);
/*
* Decay prev_thrashing unless over-the-limit thrashing was registered in the window we
@ -2440,7 +2441,7 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
thrashing_limit = thrashing_limit_pct;
} else {
/* Calculate what % of the file-backed pagecache refaulted so far */
thrashing = (vs.field.workingset_refault - init_ws_refault) * 100 / base_file_lru;
thrashing = (vs.field.workingset_refault - init_ws_refault) * 100 / (base_file_lru + 1);
}
/* Add previous cycle's decayed thrashing amount */
thrashing += prev_thrash_growth;