diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index ce2421e6a268692a07d5c6bfa21da4877aac66ff..1980dc66080b2c1d5bc39d2fa84a5fc5df081e2b 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -97,6 +97,8 @@
#define min(a, b) (((a) < (b)) ? (a) : (b))
+#define FAIL_REPORT_RLIMIT_MS 1000
+
/* default to old in-kernel interface if no memory pressure events */
static bool use_inkernel_interface = true;
static bool has_inkernel_module;
@@ -1097,8 +1099,7 @@ static struct proc *proc_get_heaviest(int oomadj) {
}
/* Kill one process specified by procp. Returns the size of the process killed */
-static int kill_one_process(struct proc* procp, int min_score_adj,
- enum vmpressure_level level) {
+static int kill_one_process(struct proc* procp) {
int pid = procp->pid;
uid_t uid = procp->uid;
char *taskname;
@@ -1132,11 +1133,8 @@ static int kill_one_process(struct proc* procp, int min_score_adj,
/* CAP_KILL required */
r = kill(pid, SIGKILL);
- ALOGI(
- "Killing '%s' (%d), uid %d, adj %d\n"
- " to free %ldkB because system is under %s memory pressure (min_oom_adj=%d)\n",
- taskname, pid, uid, procp->oomadj, tasksize * page_k,
- level_name[level], min_score_adj);
+ ALOGI("Kill '%s' (%d), uid %d, oom_adj %d to free %ldkB",
+ taskname, pid, uid, procp->oomadj, tasksize * page_k);
pid_remove(pid);
TRACE_KILL_END();
@@ -1163,8 +1161,7 @@ static int kill_one_process(struct proc* procp, int min_score_adj,
* If pages_to_free is set to 0 only one process will be killed.
* Returns the size of the killed processes.
*/
-static int find_and_kill_processes(enum vmpressure_level level,
- int min_score_adj, int pages_to_free) {
+static int find_and_kill_processes(int min_score_adj, int pages_to_free) {
int i;
int killed_size;
int pages_freed = 0;
@@ -1183,7 +1180,7 @@ static int find_and_kill_processes(enum vmpressure_level level,
if (!procp)
break;
- killed_size = kill_one_process(procp, min_score_adj, level);
+ killed_size = kill_one_process(procp);
if (killed_size >= 0) {
#ifdef LMKD_LOG_STATS
if (enable_stats_log && !lmk_state_change_start) {
@@ -1282,6 +1279,7 @@ static void mp_event_common(int data, uint32_t events __unused) {
enum vmpressure_level lvl;
union meminfo mi;
union zoneinfo zi;
+ struct timespec curr_tm;
static struct timespec last_kill_tm;
static unsigned long kill_skip_count = 0;
enum vmpressure_level level = (enum vmpressure_level)data;
@@ -1312,14 +1310,12 @@ static void mp_event_common(int data, uint32_t events __unused) {
}
}
- if (kill_timeout_ms) {
- struct timespec curr_tm;
-
- if (clock_gettime(CLOCK_MONOTONIC_COARSE, &curr_tm) != 0) {
- ALOGE("Failed to get current time");
- return;
- }
+ if (clock_gettime(CLOCK_MONOTONIC_COARSE, &curr_tm) != 0) {
+ ALOGE("Failed to get current time");
+ return;
+ }
+ if (kill_timeout_ms) {
if (get_time_diff_ms(&last_kill_tm, &curr_tm) < kill_timeout_ms) {
kill_skip_count++;
return;
@@ -1425,7 +1421,7 @@ static void mp_event_common(int data, uint32_t events __unused) {
do_kill:
if (low_ram_device) {
/* For Go devices kill only one task */
- if (find_and_kill_processes(level, level_oomadj[level], 0) == 0) {
+ if (find_and_kill_processes(level_oomadj[level], 0) == 0) {
if (debug_process_killing) {
ALOGI("Nothing to kill");
}
@@ -1434,6 +1430,8 @@ do_kill:
}
} else {
int pages_freed;
+ static struct timespec last_report_tm;
+ static unsigned long report_skip_count = 0;
if (!use_minfree_levels) {
/* If pressure level is less than critical and enough free swap then ignore */
@@ -1461,30 +1459,41 @@ do_kill:
min_score_adj = level_oomadj[level];
}
- pages_freed = find_and_kill_processes(level, min_score_adj, pages_to_free);
+ pages_freed = find_and_kill_processes(min_score_adj, pages_to_free);
- if (use_minfree_levels) {
- ALOGI("Killing because cache %ldkB is below "
- "limit %ldkB for oom_adj %d\n"
- " Free memory is %ldkB %s reserved",
- other_file * page_k, minfree * page_k, min_score_adj,
- other_free * page_k, other_free >= 0 ? "above" : "below");
+ if (pages_freed == 0) {
+ /* Rate limit kill reports when nothing was reclaimed */
+ if (get_time_diff_ms(&last_report_tm, &curr_tm) < FAIL_REPORT_RLIMIT_MS) {
+ report_skip_count++;
+ return;
+ }
}
- if (pages_freed < pages_to_free) {
- ALOGI("Unable to free enough memory (pages to free=%d, pages freed=%d)",
- pages_to_free, pages_freed);
+ /* Log meminfo whenever we kill or when report rate limit allows */
+ meminfo_log(&mi);
+ if (pages_freed >= pages_to_free) {
+ /* Reset kill time only if reclaimed enough memory */
+ last_kill_tm = curr_tm;
+ }
+
+ if (use_minfree_levels) {
+ ALOGI("Killing to reclaim %ldkB, reclaimed %ldkB, cache(%ldkB) and "
+ "free(%" PRId64 "kB)-reserved(%" PRId64 "kB) below min(%ldkB) for oom_adj %d",
+ pages_to_free * page_k, pages_freed * page_k,
+ other_file * page_k, mi.field.nr_free_pages * page_k,
+ zi.field.totalreserve_pages * page_k,
+ minfree * page_k, min_score_adj);
} else {
- ALOGI("Reclaimed enough memory (pages to free=%d, pages freed=%d)",
- pages_to_free, pages_freed);
- if (clock_gettime(CLOCK_MONOTONIC_COARSE, &last_kill_tm) != 0) {
- ALOGE("Failed to get current time");
- return;
- }
+ ALOGI("Killing to reclaim %ldkB, reclaimed %ldkB at oom_adj %d",
+ pages_to_free * page_k, pages_freed * page_k, min_score_adj);
}
- if (pages_freed > 0) {
- meminfo_log(&mi);
+
+ if (report_skip_count > 0) {
+ ALOGI("Suppressed %lu failed kill reports", report_skip_count);
+ report_skip_count = 0;
}
+
+ last_report_tm = curr_tm;
}
}
diff --git a/lmkd/tests/lmkd_test.cpp b/lmkd/tests/lmkd_test.cpp
index 1996bae29aaed40598a2bfa6ebaa932efa97ba7d..f54b25cf7f86cb79adf459f636c7aa971cba4a4f 100644
--- a/lmkd/tests/lmkd_test.cpp
+++ b/lmkd/tests/lmkd_test.cpp
@@ -39,7 +39,7 @@ using namespace android::base;
#define LMKDTEST_RESPAWN_FLAG "LMKDTEST_RESPAWN"
#define LMKD_LOGCAT_MARKER "lowmemorykiller"
-#define LMKD_KILL_MARKER_TEMPLATE LMKD_LOGCAT_MARKER ": Killing '%s'"
+#define LMKD_KILL_MARKER_TEMPLATE LMKD_LOGCAT_MARKER ": Kill '%s'"
#define OOM_MARKER "Out of memory"
#define OOM_KILL_MARKER "Killed process"
#define MIN_LOG_SIZE 100