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Commit aa58e9af authored by David Ahern's avatar David Ahern Committed by Arnaldo Carvalho de Melo
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perf kmem stat: Track memory freed 



Track freed memory as well as allocations and show the net in the
summary.

Committer notes:

Testing it:

  # perf kmem record usleep 1
  [ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 1.626 MB perf.data (4208 samples) ]
  [root@jouet ~]# perf kmem stat --slab

  SUMMARY (SLAB allocator)
  ========================
  Total bytes requested: 234,011
  Total bytes allocated: 234,504
  Total bytes freed:     213,328                                 <------
  Net total bytes allocated: 21,176
  Total bytes wasted on internal fragmentation: 493
  Internal fragmentation: 0.210231%
  Cross CPU allocations: 4/1,963
  #

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1480110133-37039-1-git-send-email-dsahern@gmail.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 030910c0

tools/perf/builtin-kmem.c

+11 −1
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct alloc_stat { 
	u64	ptr;

	u64	bytes_req;

	u64	bytes_alloc;

	u64	last_alloc;

	u32	hit;

	u32	pingpong;
@@ -62,7 +63,7 @@ static struct rb_root root_alloc_sorted; 
static struct rb_root root_caller_stat;

static struct rb_root root_caller_sorted;



static unsigned long total_requested, total_allocated;

static unsigned long total_requested, total_allocated, total_freed;

static unsigned long nr_allocs, nr_cross_allocs;



static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
@@ -105,6 +106,8 @@ static int insert_alloc_stat(unsigned long call_site, unsigned long ptr, 
	}

	data->call_site = call_site;

	data->alloc_cpu = cpu;

	data->last_alloc = bytes_alloc;



	return 0;

}
@@ -223,6 +226,8 @@ static int perf_evsel__process_free_event(struct perf_evsel *evsel, 
	if (!s_alloc)

		return 0;



	total_freed += s_alloc->last_alloc;



	if ((short)sample->cpu != s_alloc->alloc_cpu) {

		s_alloc->pingpong++;
@@ -1128,6 +1133,11 @@ static void print_slab_summary(void) 
	printf("\n========================\n");

	printf("Total bytes requested: %'lu\n", total_requested);

	printf("Total bytes allocated: %'lu\n", total_allocated);

	printf("Total bytes freed:     %'lu\n", total_freed);

	if (total_allocated > total_freed) {

		printf("Net total bytes allocated: %'lu\n",

		total_allocated - total_freed);

	}

	printf("Total bytes wasted on internal fragmentation: %'lu\n",

	       total_allocated - total_requested);

	printf("Internal fragmentation: %f%%\n",