Merge changes from topic "default_psi_kill_mode" (8c1d025d) · Commits · e / os / android_system_core

lmkd/lmkd.c

+21 −4

Original line number	Diff line number	Diff line
		@@ -83,6 +83,8 @@
		#define PROC_STATUS_TGID_FIELD "Tgid:"
		#define LINE_MAX 128

		#define PERCEPTIBLE_APP_ADJ 200

		/* Android Logger event logtags (see event.logtags) */
		#define MEMINFO_LOG_TAG 10195355

		@@ -2046,6 +2048,8 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
		enum reclaim_state reclaim = NO_RECLAIM;
		enum zone_watermark wmark = WMARK_NONE;
		char kill_desc[LINE_MAX];
		bool cut_thrashing_limit = false;
		int min_score_adj = 0;

		/* Skip while still killing a process */
		if (is_kill_pending()) {
		@@ -2164,22 +2168,35 @@ static void mp_event_psi(int data, uint32_t events, struct polling_params *poll_
		mi.field.free_swap * page_k, swap_low_threshold * page_k);
		} else if (wmark < WMARK_HIGH && thrashing > thrashing_limit) {
		/* Page cache is thrashing while memory is low */
		thrashing_limit = (thrashing_limit * (100 - thrashing_limit_decay_pct)) / 100;
		kill_reason = LOW_MEM_AND_THRASHING;
		snprintf(kill_desc, sizeof(kill_desc), "%s watermark is breached and thrashing (%"
		PRId64 "%%)", wmark > WMARK_LOW ? "min" : "low", thrashing);
		cut_thrashing_limit = true;
		/* Do not kill perceptible apps because of thrashing */
		min_score_adj = PERCEPTIBLE_APP_ADJ;
		} else if (reclaim == DIRECT_RECLAIM && thrashing > thrashing_limit) {
		/* Page cache is thrashing while in direct reclaim (mostly happens on lowram devices) */
		thrashing_limit = (thrashing_limit * (100 - thrashing_limit_decay_pct)) / 100;
		kill_reason = DIRECT_RECL_AND_THRASHING;
		snprintf(kill_desc, sizeof(kill_desc), "device is in direct reclaim and thrashing (%"
		PRId64 "%%)", thrashing);
		cut_thrashing_limit = true;
		/* Do not kill perceptible apps because of thrashing */
		min_score_adj = PERCEPTIBLE_APP_ADJ;
		}

		/* Kill a process if necessary */
		if (kill_reason != NONE) {
		int pages_freed = find_and_kill_process(0, kill_desc);
		killing = (pages_freed > 0);
		int pages_freed = find_and_kill_process(min_score_adj, kill_desc);
		if (pages_freed > 0) {
		killing = true;
		if (cut_thrashing_limit) {
		/*
		* Cut thrasing limit by thrashing_limit_decay_pct percentage of the current
		* thrashing limit until the system stops thrashing.
		*/
		thrashing_limit = (thrashing_limit * (100 - thrashing_limit_decay_pct)) / 100;
		}
		}
		meminfo_log(&mi);
		}