perf tools: Fix multi-counter stat bug caused by incorrect reading of perf.data file...
Peter Zijlstra [Thu, 6 Aug 2009 18:57:41 +0000 (20:57 +0200)]
Brice Goglin reported that only the first result from a
multi-counter perf record --stat run is accurate, the
rest looks bogus.

A silly mistake made us re-read the first attribute for
every recorded attribute.

Reported-by: Brice Goglin <Brice.Goglin@inria.fr>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Brice Goglin <Brice.Goglin@inria.fr>
Cc: paulus@samba.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/header.c

index 450384b..95a44bc 100644 (file)
@@ -213,9 +213,10 @@ struct perf_header *perf_header__read(int fd)
 
        for (i = 0; i < nr_attrs; i++) {
                struct perf_header_attr *attr;
-               off_t tmp = lseek(fd, 0, SEEK_CUR);
+               off_t tmp;
 
                do_read(fd, &f_attr, sizeof(f_attr));
+               tmp = lseek(fd, 0, SEEK_CUR);
 
                attr = perf_header_attr__new(&f_attr.attr);