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authorYunlong Song <yunlong.song@huawei.com>2015-03-31 21:46:35 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-08 09:07:26 -0300
commitf0dd330fdf07d295ac468660cf60341796d5d501 (patch)
treea11194faf44d9b37ca0392f484c3f1e484f641e1 /tools/perf/builtin-sched.c
parent939cda521a24ae4dbf3beec983abd519bce56231 (diff)
downloadlinux-f0dd330fdf07d295ac468660cf60341796d5d501.tar.gz
perf sched replay: Support using -f to override perf.data file ownership
Enable to use perf.data when it is not owned by current user or root. Example: $ ls -al perf.data -rw------- 1 Yunlong.Song Yunlong.Song 5321918 Mar 25 15:14 perf.data $ sudo id uid=0(root) gid=0(root) groups=0(root),64(pkcs11) Before this patch: $ sudo perf sched replay -f run measurement overhead: 98 nsecs sleep measurement overhead: 52909 nsecs the run test took 1000015 nsecs the sleep test took 1054253 nsecs File perf.data not owned by current user or root (use -f to override) As shown above, the -f option does not work at all. After this patch: $ sudo perf sched replay -f run measurement overhead: 221 nsecs sleep measurement overhead: 40514 nsecs the run test took 1000003 nsecs the sleep test took 1056098 nsecs nr_run_events: 10 nr_sleep_events: 1562 nr_wakeup_events: 5 task 0 ( :1: 1), nr_events: 1 task 1 ( :2: 2), nr_events: 1 task 2 ( :3: 3), nr_events: 1 ... ... task 1549 ( :163132: 163132), nr_events: 1 task 1550 ( :163540: 163540), nr_events: 1 task 1551 ( <unknown>: 0), nr_events: 10 ------------------------------------------------------------ #1 : 50.198, ravg: 50.20, cpu: 2335.18 / 2335.18 #2 : 219.099, ravg: 67.09, cpu: 2835.11 / 2385.17 #3 : 238.626, ravg: 84.24, cpu: 3278.26 / 2474.48 #4 : 200.364, ravg: 95.85, cpu: 2977.41 / 2524.77 #5 : 176.882, ravg: 103.96, cpu: 2801.35 / 2552.43 #6 : 191.093, ravg: 112.67, cpu: 2813.70 / 2578.56 #7 : 189.448, ravg: 120.35, cpu: 2809.21 / 2601.62 #8 : 200.637, ravg: 128.38, cpu: 2849.91 / 2626.45 #9 : 248.338, ravg: 140.37, cpu: 4380.61 / 2801.87 #10 : 511.139, ravg: 177.45, cpu: 3077.73 / 2829.45 As shown above, the -f option really works now. Besides for replay, -f option can also work for latency and map. Signed-off-by: Yunlong Song <yunlong.song@huawei.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1427809596-29559-9-git-send-email-yunlong.song@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-sched.c')
-rw-r--r--tools/perf/builtin-sched.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 5ab58c6d2467..7b7b798b22b2 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1487,6 +1487,7 @@ static int perf_sched__read_events(struct perf_sched *sched)
struct perf_data_file file = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
+ .force = sched->force,
};
int rc = -1;