path: root/tools/perf/util/map.h
diff options
authorArnaldo Carvalho de Melo <acme@redhat.com>2010-08-02 19:45:23 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-08-02 19:45:23 -0300
commit0a1eae391d0d92b60cff9f55cdaf3861b4e33922 (patch)
tree1482c70150e51f37849304385833d233475da192 /tools/perf/util/map.h
parentperf session: Invalidate last_match when removing threads from rb_tree (diff)
perf tools: Don't keep unreferenced maps when unmaps are detected
For a file with: [root@emilia linux-2.6-tip]# perf report -D -fi allmodconfig-j32.perf.data | grep events: TOTAL events: 36933 MMAP events: 9056 LOST events: 0 COMM events: 1702 EXIT events: 1887 THROTTLE events: 8 UNTHROTTLE events: 8 FORK events: 1894 READ events: 0 SAMPLE events: 22378 ATTR events: 0 EVENT_TYPE events: 0 TRACING_DATA events: 0 BUILD_ID events: 0 [root@emilia linux-2.6-tip]# Testing with valgrind and making perf_session__delete() a nop, so that we can notice how many maps were actually deleted due to not having any samples on it: ==== HEAP SUMMARY: Before: ==10339== in use at exit: 8,909,997 bytes in 68,690 blocks ==10339== total heap usage: 78,696 allocs, 10,007 frees, 11,925,853 bytes allocated After: ==10506== in use at exit: 8,902,605 bytes in 68,606 blocks ==10506== total heap usage: 78,696 allocs, 10,091 frees, 11,925,853 bytes allocated I.e. just 84 detected unmaps with no hits out of 9056 for this workload, not much, but in some other long running workload this may save more bytes. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 5b51bbd2f734..78575796d5f3 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -29,7 +29,8 @@ struct map {
u64 start;
u64 end;
- enum map_type type;
+ u8 /* enum map_type */ type;
+ bool referenced;
u32 priv;
u64 pgoff;