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lmkd: Add a tracepoint for each kill with kill parameters 

Add a trace for each kill that includes pid, kill reason, oom_adj_score,
min_oom_score and max_thrashing statistics at the time of the kill.

Bug: 195085238
Test: generate kills while tracing and observer the new tracepoints
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ic2014adc08f5e5dd4aacd415970332618bd15250
This commit is contained in:
Suren Baghdasaryan 2021-07-29 17:02:51 -07:00
parent e16047516d
commit 34928bb817
1 changed files with 16 additions and 6 deletions
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22
lmkd.cpp
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@ -65,13 +65,20 @@
#define ATRACE_TAG ATRACE_TAG_ALWAYS
#include <cutils/trace.h>
#define TRACE_KILL_START(pid) ATRACE_INT(__FUNCTION__, pid);
#define TRACE_KILL_END() ATRACE_INT(__FUNCTION__, 0);
static inline void trace_kill_start(int pid, const char *desc) {
ATRACE_INT("kill_one_process", pid);
ATRACE_BEGIN(desc);
}
static inline void trace_kill_end() {
ATRACE_END();
ATRACE_INT("kill_one_process", 0);
}
#else /* LMKD_TRACE_KILLS */
#define TRACE_KILL_START(pid) ((void)(pid))
#define TRACE_KILL_END() ((void)0)
static inline void trace_kill_start(int, const char *) {}
static inline void trace_kill_end() {}
#endif /* LMKD_TRACE_KILLS */
@ -2132,6 +2139,7 @@ static int kill_one_process(struct proc* procp, int min_oom_score, struct kill_i
int64_t rss_kb;
int64_t swap_kb;
char buf[PAGE_SIZE];
char desc[LINE_MAX];
if (!read_proc_status(pid, buf, sizeof(buf))) {
goto out;
@ -2160,7 +2168,9 @@ static int kill_one_process(struct proc* procp, int min_oom_score, struct kill_i
mem_st = stats_read_memory_stat(per_app_memcg, pid, uid, rss_kb * 1024, swap_kb * 1024);
TRACE_KILL_START(pid);
snprintf(desc, sizeof(desc), "lmk,%d,%d,%d,%d,%d", pid, (int)ki->kill_reason, procp->oomadj,
min_oom_score, ki->max_thrashing);
trace_kill_start(pid, desc);
/* CAP_KILL required */
if (pidfd < 0) {
@ -2171,7 +2181,7 @@ static int kill_one_process(struct proc* procp, int min_oom_score, struct kill_i
r = pidfd_send_signal(pidfd, SIGKILL, NULL, 0);
}
TRACE_KILL_END();
trace_kill_end();
if (r) {
stop_wait_for_proc_kill(false);