From 0a1eae391d0d92b60cff9f55cdaf3861b4e33922 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Mon, 2 Aug 2010 19:45:23 -0300 Subject: 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 Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Stephane Eranian LKML-Reference: Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/hist.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/perf/util/hist.c') diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index a6cea2894d12..e7263d49bcf0 100644 --- a/tools/perf/util/hist.c +++ b/tools/perf/util/hist.c @@ -93,6 +93,8 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template) if (self != NULL) { *self = *template; self->nr_events = 1; + if (self->ms.map) + self->ms.map->referenced = true; if (symbol_conf.use_callchain) callchain_init(self->callchain); } -- cgit v1.2.3-59-g8ed1b