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lowmemorykiller: trace kill events.

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Allows for capturing lmk kill events and
their rationale.

Change-Id: Ibe215db5bb9806fc550c72c0b9832c85cbd56bf6
Signed-off-by: Martijn Coenen <maco@google.com>
This commit is contained in:
Martijn Coenen
2015-05-26 11:28:47 +02:00
committed by John Stultz
parent 758a1cb1f6
commit 29d59f1152
2 changed files with 50 additions and 3 deletions
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12
drivers/staging/android/lowmemorykiller.c
View File

@@ -43,6 +43,9 @@
#include <linux/profile.h>
#include <linux/notifier.h>
#define CREATE_TRACE_POINTS
#include "trace/lowmemorykiller.h"
static uint32_t lowmem_debug_level = 1;
static short lowmem_adj[6] = {
0,
@@ -168,6 +171,10 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
if (selected->mm)
mark_oom_victim(selected);
task_unlock(selected);
long cache_size = other_file * (long)(PAGE_SIZE / 1024);
long cache_limit = minfree * (long)(PAGE_SIZE / 1024);
long free = other_free * (long)(PAGE_SIZE / 1024);
trace_lowmemory_kill(selected, cache_size, cache_limit, free);
lowmem_print(1, "Killing '%s' (%d), adj %hd,\n" \
" to free %ldkB on behalf of '%s' (%d) because\n" \
" cache %ldkB is below limit %ldkB for oom_score_adj %hd\n" \
@@ -176,10 +183,9 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
selected_oom_score_adj,
selected_tasksize * (long)(PAGE_SIZE / 1024),
current->comm, current->pid,
other_file * (long)(PAGE_SIZE / 1024),
minfree * (long)(PAGE_SIZE / 1024),
cache_size, cache_limit,
min_score_adj,
other_free * (long)(PAGE_SIZE / 1024));
free);
lowmem_deathpending_timeout = jiffies + HZ;
rem += selected_tasksize;
}

41
drivers/staging/android/trace/lowmemorykiller.h Normal file
View File

@@ -0,0 +1,41 @@
#undef TRACE_SYSTEM
#define TRACE_INCLUDE_PATH ../../drivers/staging/android/trace
#define TRACE_SYSTEM lowmemorykiller
#if !defined(_TRACE_LOWMEMORYKILLER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_LOWMEMORYKILLER_H
#include <linux/tracepoint.h>
TRACE_EVENT(lowmemory_kill,
TP_PROTO(struct task_struct *killed_task, long cache_size, \
long cache_limit, long free),
TP_ARGS(killed_task, cache_size, cache_limit, free),
TP_STRUCT__entry(
__array(char, comm, TASK_COMM_LEN)
__field(pid_t, pid)
__field(long, pagecache_size)
__field(long, pagecache_limit)
__field(long, free)
),
TP_fast_assign(
memcpy(__entry->comm, killed_task->comm, TASK_COMM_LEN);
__entry->pid = killed_task->pid;
__entry->pagecache_size = cache_size;
__entry->pagecache_limit = cache_limit;
__entry->free = free;
),
TP_printk("%s (%d), page cache %ldkB (limit %ldkB), free %ldKb",
__entry->comm, __entry->pid, __entry->pagecache_size,
__entry->pagecache_limit, __entry->free)
);
#endif /* if !defined(_TRACE_LOWMEMORYKILLER_H) || defined(TRACE_HEADER_MULTI_READ) */
/* This part must be outside protection */
#include <trace/define_trace.h>