[PATCH] perf kmem stat: Track memory freed

[David Ahern]

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

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 tools/perf/builtin-kmem.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index f184ecf9b0b3..cd662dd8eaf8 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -50,6 +50,7 @@ struct alloc_stat {
        u64     ptr;
        u64     bytes_req;
        u64     bytes_alloc;
+       u64     last_alloc;
        u32     hit;
        u32     pingpong;
 
@@ -63,7 +64,7 @@ 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;
 
 /* filters for controlling start and stop of time of analysis */
@@ -110,6 +111,8 @@ 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;
 }
 
@@ -228,6 +231,8 @@ 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++;
 
@@ -1145,6 +1150,11 @@ 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",
-- 
2.7.4 (Apple Git-66)