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lmkd: avoid division by zero because of file_base_lru am: c3108416e7 am: b1294d486f am: d2d14448f3 

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

Change-Id: Ic4287b1fb3ef6f7d0100a8e9ee0764b48ce77503
This commit is contained in:
Martin Liu 2020-09-03 17:05:46 +00:00 committed by Automerger Merge Worker
parent 21a6082a6a d2d14448f3
commit 6e9525ad51
1 changed files with 3 additions and 2 deletions
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lmkd.cpp
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@ -2424,7 +2424,8 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
if (since_thrashing_reset_ms > THRASHING_RESET_INTERVAL_MS) { if (since_thrashing_reset_ms > THRASHING_RESET_INTERVAL_MS) {
long windows_passed; long windows_passed;
/* Calculate prev_thrash_growth if we crossed THRASHING_RESET_INTERVAL_MS */ /* 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); windows_passed = (since_thrashing_reset_ms / THRASHING_RESET_INTERVAL_MS);
/* /*
* Decay prev_thrashing unless over-the-limit thrashing was registered in the window we * Decay prev_thrashing unless over-the-limit thrashing was registered in the window we
@ -2442,7 +2443,7 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
thrashing_limit = thrashing_limit_pct; thrashing_limit = thrashing_limit_pct;
} else { } else {
/* Calculate what % of the file-backed pagecache refaulted so far */ /* 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 */ /* Add previous cycle's decayed thrashing amount */
thrashing += prev_thrash_growth; thrashing += prev_thrash_growth;