linux-kernel - [PATCH] perf kmem stat: Track memory freed

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Date:   Fri, 25 Nov 2016 14:42:13 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     acme@...nel.org
Cc:     mingo@...nel.org, peterz@...radead.org, namhyung@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org,
        David Ahern <dsahern@...il.com>
Subject: [PATCH] perf kmem stat: Track memory freed

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

Signed-off-by: David Ahern <dsahern@...il.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)