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Merge "Add MCL_ONFAULT to mlockall"

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Daniel Colascione 2018-01-24 06:10:17 +00:00 committed by Gerrit Code Review
commit ccb9960beb
1 changed files with 10 additions and 1 deletions
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11
lmkd/lmkd.c
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@ -900,7 +900,16 @@ int main(int argc __unused, char **argv __unused) {
downgrade_pressure = (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 60);
is_go_device = property_get_bool("ro.config.low_ram", false);
if (mlockall(MCL_CURRENT | MCL_FUTURE))
// MCL_ONFAULT pins pages as they fault instead of loading
// everything immediately all at once. (Which would be bad,
// because as of this writing, we have a lot of mapped pages we
// never use.) Old kernels will see MCL_ONFAULT and fail with
// EINVAL; we ignore this failure.
//
// N.B. read the man page for mlockall. MCL_CURRENT | MCL_ONFAULT
// pins ⊆ MCL_CURRENT, converging to just MCL_CURRENT as we fault
// in pages.
if (mlockall(MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT) && errno != EINVAL)
ALOGW("mlockall failed: errno=%d", errno);
sched_setscheduler(0, SCHED_FIFO, &param);