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Add MCL_ONFAULT to mlockall 

This way, we don't fault in the entirety of our DSOs immediately;
instead, used pages are "sticky" in memory. Works only on kernel 4.4
and up: downlevel, we ignore the mlockall failure.

Once we get statically-linked lmkd in better shape, we'll just switch
to that.

Change-Id: I07a75ee3bc1264a1db41635c2acf611fede99b91
This commit is contained in:
Daniel Colascione 2018-01-05 14:59:55 -08:00
parent 4664833104
commit abe25b1fca
1 changed files with 10 additions and 1 deletions
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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); downgrade_pressure = (int64_t)property_get_int32("ro.lmk.downgrade_pressure", 60);
is_go_device = property_get_bool("ro.config.low_ram", false); 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); ALOGW("mlockall failed: errno=%d", errno);
sched_setscheduler(0, SCHED_FIFO, &param); sched_setscheduler(0, SCHED_FIFO, &param);