perf kmem stat: Track memory freed (aa58e9af) · Commits · 戴 / test

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:

David Ahern <dsahern@gmail.com> Tested-by:

Arnaldo 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:

Arnaldo Carvalho de Melo <acme@redhat.com>

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",

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