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lmkd: add kill when swap utilization is too high am: 51ee4c505f am: 45737af035 

Change-Id: Id06d5db6fa0ec9f7c15247afd4e6b558264080f9
This commit is contained in:
Suren Baghdasaryan 2020-04-30 00:33:12 +00:00 committed by Automerger Merge Worker
parent d61445c93c 45737af035
commit 1e7908dbc7
1 changed files with 21 additions and 0 deletions
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21
lmkd.cpp
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@ -200,6 +200,7 @@ static int psi_partial_stall_ms;
static int psi_complete_stall_ms;
static int thrashing_limit_pct;
static int thrashing_limit_decay_pct;
static int swap_util_max;
static bool use_psi_monitors = false;
static int kpoll_fd;
static struct psi_threshold psi_thresholds[VMPRESS_LEVEL_COUNT] = {
@ -2202,6 +2203,13 @@ void calc_zone_watermarks(struct zoneinfo *zi, struct zone_watermarks *watermark
}
}
static int calc_swap_utilization(union meminfo *mi) {
int64_t swap_used = mi->field.total_swap - mi->field.free_swap;
int64_t total_swappable = mi->field.active_anon + mi->field.inactive_anon +
mi->field.shmem + swap_used;
return total_swappable > 0 ? (swap_used * 100) / total_swappable : 0;
}
static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_params) {
enum kill_reasons {
NONE = -1, /* To denote no kill condition */
@ -2211,6 +2219,7 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
LOW_MEM_AND_SWAP,
LOW_MEM_AND_THRASHING,
DIRECT_RECL_AND_THRASHING,
LOW_MEM_AND_SWAP_UTIL,
KILL_REASON_COUNT
};
enum reclaim_state {
@ -2242,6 +2251,7 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
char kill_desc[LINE_MAX];
bool cut_thrashing_limit = false;
int min_score_adj = 0;
int swap_util = 0;
/* Skip while still killing a process */
if (is_kill_pending()) {
@ -2362,6 +2372,16 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
snprintf(kill_desc, sizeof(kill_desc), "%s watermark is breached and swap is low (%"
PRId64 "kB < %" PRId64 "kB)", wmark > WMARK_LOW ? "min" : "low",
mi.field.free_swap * page_k, swap_low_threshold * page_k);
} else if (wmark < WMARK_HIGH && swap_util_max < 100 &&
(swap_util = calc_swap_utilization(&mi)) > swap_util_max) {
/*
* Too much anon memory is swapped out but swap is not low.
* Non-swappable allocations created memory pressure.
*/
kill_reason = LOW_MEM_AND_SWAP_UTIL;
snprintf(kill_desc, sizeof(kill_desc), "%s watermark is breached and swap utilization"
" is high (%d%% > %d%%)", wmark > WMARK_LOW ? "min" : "low",
swap_util, swap_util_max);
} else if (wmark < WMARK_HIGH && thrashing > thrashing_limit) {
/* Page cache is thrashing while memory is low */
kill_reason = LOW_MEM_AND_THRASHING;
@ -3082,6 +3102,7 @@ int main(int argc __unused, char **argv __unused) {
low_ram_device ? DEF_THRASHING_LOWRAM : DEF_THRASHING));
thrashing_limit_decay_pct = clamp(0, 100, property_get_int32("ro.lmk.thrashing_limit_decay",
low_ram_device ? DEF_THRASHING_DECAY_LOWRAM : DEF_THRASHING_DECAY));
swap_util_max = clamp(0, 100, property_get_int32("ro.lmk.swap_util_max", 100));
ctx = create_android_logger(KILLINFO_LOG_TAG);