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lmkd: count the number of times LMKD wakes up 

LMKD was woken up when the memory pressure was high enough either in
either the psi or the vmpressure mechanism. The memory reclaim ability
is based on CPUs' capacity of a chip and it is different from each
others. This patch can count the number of lmkd wake up when meet the
memory pressure threshold instead of heavy-loading logging. To show the
count, we can just re-init the lmkd, and it will print in the android
logcat and reset the count to zero.

Test: Run APP rotation

Bug: 365748420
Signed-off-by: JohnHsu <john.hsu@mediatek.com>
Change-Id: I3980d2a90a910c64449b4ad2b005e4d0437097e8
This commit is contained in:
JohnHsu 2024-09-09 19:49:26 +08:00 committed by MugaChi
parent 1683221f0d
commit a63948e455
1 changed files with 13 additions and 1 deletions
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14
lmkd.cpp
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@ -245,6 +245,8 @@ static struct psi_threshold psi_thresholds[VMPRESS_LEVEL_COUNT] = {
{ PSI_FULL, 70 }, /* 70ms out of 1sec for complete stall */
};
static uint64_t mp_event_count;
static android_log_context ctx;
static Reaper reaper;
static int reaper_comm_fd[2];
@ -2716,6 +2718,12 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
long direct_reclaim_duration_ms;
bool in_kswapd_reclaim;
mp_event_count++;
if (debug_process_killing) {
ALOGI("%s memory pressure event #%" PRIu64 " is triggered",
level_name[level], mp_event_count);
}
if (clock_gettime(CLOCK_MONOTONIC_COARSE, &curr_tm) != 0) {
ALOGE("Failed to get current time");
return;
@ -3066,8 +3074,10 @@ static void mp_event_common(int data, uint32_t events, struct polling_params *po
};
static struct wakeup_info wi;
mp_event_count++;
if (debug_process_killing) {
ALOGI("%s memory pressure event is triggered", level_name[level]);
ALOGI("%s memory pressure event #%" PRIu64 " is triggered",
level_name[level], mp_event_count);
}
if (!use_psi_monitors) {
@ -3582,6 +3592,8 @@ static void kernel_event_handler(int data __unused, uint32_t events __unused,
}
static bool init_monitors() {
ALOGI("Wakeup counter is reset from %" PRIu64 " to 0", mp_event_count);
mp_event_count = 0;
/* Try to use psi monitor first if kernel has it */
use_psi_monitors = GET_LMK_PROPERTY(bool, "use_psi", true) &&
init_psi_monitors();