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Commit fbc83982 authored by Martijn Coenen's avatar Martijn Coenen
Browse files

lowmemorykiller: trace kill events. 



Allows for capturing lmk kill events and
their rationale.

Change-Id: Ibe215db5bb9806fc550c72c0b9832c85cbd56bf6
Signed-off-by: default avatarMartijn Coenen <maco@google.com>
parent e9e50082

drivers/staging/android/lowmemorykiller.c

+9 −3
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ 
#include <linux/rcupdate.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,
@@ -156,6 +159,10 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) 
			     p->comm, p->pid, oom_score_adj, tasksize);

	}

	if (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" \
@@ -164,10 +171,9 @@ 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;

		set_tsk_thread_flag(selected, TIF_MEMDIE);

		send_sig(SIGKILL, selected, 0);

drivers/staging/android/trace/lowmemorykiller.h

0 → 100644
+41 −0
Original line number Diff line number Diff line 
#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>