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lmkd: avoid division by zero because of file_base_lru 

It seems we have chance that file_base_lru is zero.
Avoid it by adding 1.

Bug: 167660459
Bug: 163134367
Test: boot
Signed-off-by: Martin Liu <liumartin@google.com>
Merged-In: If19dbbaafe6cd28a9d5b7f8a002f3cd33daab5e7
Change-Id: If19dbbaafe6cd28a9d5b7f8a002f3cd33daab5e7
This commit is contained in:
Martin Liu 2020-09-03 22:12:14 +08:00
parent 94d99a7bc8
commit 91bf598282
1 changed files with 3 additions and 2 deletions
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5
lmkd.cpp
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@ -2399,7 +2399,8 @@ 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
@ -2417,7 +2418,7 @@ 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;