[PATCH 12/19] perf sched replay: Support using -f to override perf.data file ownership
From: Arnaldo Carvalho de Melo
Date: Wed Apr 08 2015 - 10:27:45 EST
From: Yunlong Song <yunlong.song@xxxxxxxxxx>
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@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1427809596-29559-9-git-send-email-yunlong.song@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-sched.c | 1 +
1 file changed, 1 insertion(+)
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;
--
1.9.3
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