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: 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>
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index d426dcb..7fd6f1e 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -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",
