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Date: Fri, 04 Dec 2009 12:21:33 +0200
From: Török Edwin <edwintorok@...il.com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>
CC: Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Unable to use tools/perf sched and timechart correctly
Hi,
I installed 2.6.32 and tried its tools/perf.
I noticed two problems so far, please tell me if I am doing anything
wrong here:
1. 'perf sched replay' segfaults on any recorded workload
I tested like this:
$ sudo ./perf sched record
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.295 MB perf.data (~12869 samples) ]
$ sudo perf sched replay
run measurement overhead: 1258 nsecs
sleep measurement overhead: 55232 nsecs
the run test took 999778 nsecs
the sleep test took 1055791 nsecs
nr_run_events: 182
nr_sleep_events: 209
nr_wakeup_events: 103
target-less wakeups: 12
[...]
task 25 ( icedove-bin: 8757), nr_events: 3
task 26 ( events/0: 15), nr_events: 3
------------------------------------------------------------
Segmentation fault
If I let perf sched record run for longer I get same results. I can send
you perf.data/trace.info if you can't reproduce the problem.
2. 'perf timechart' shows CPU almost idle, when in fact it is loaded 100
- 400%
$ echo "int main() {while(1){} return 0;}" >looper.c
$ gcc looper.c
$ sudo ./perf timechart record ./a.out
^C[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.608 MB perf.data (~26577 samples) ]
$ sudo ./perf timechart
Written 2.4 seconds of trace to output.svg.
Open timechart, the CPUs are most of the time in sleep state, and the
traced program (./a.out)
shows up with an entirely gray block (sleep), or doesn't show up at all!
I get the same results when trying to trace a real program, that loads
the CPU to almost 400% (according to top and gkrellm),
but in timechart output its shown only as a gray block, and the CPU is
most of the time idle (and when it isn't, the load is
attributed to other processes, not clamd):
http://www.fileden.com/files/2009/9/1/2561232/output.svg.gz
What am I doing wrong? Is the process given on commandline excluded from
the profile?
(I opened the svg with firefox, since inkscape refused to load it)
Attached is my .config
P.S. I don't know if its related but I noticed lots of segfaults of
kernel threads in dmesg:
[ 1939.527417] :<unknown>[13435]: segfault at 7f632d0826a8 ip
000000381de46e4b sp 00007f632d0826b0 error
6
[ 1939.527422] :events/0[13436]: segfault at 7f632d07e6a8 ip
000000381de46e4b sp 00007f632d07e6b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[
1939.527431]
[ 1947.751775] :<unknown>[13560]: segfault at 7f740165d6a8 ip
000000381de46e4b sp 00007f740165d6b0 error
6
[ 1947.751781] :events/0[13561]: segfault at 7f74016596a8 ip
000000381de46e4b sp 00007f74016596b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[
1947.751792]
[ 1948.709289] :<unknown>[13682]: segfault at 7f6e544a16a8 ip
000000381de46e4b sp 00007f6e544a16b0 error 6 in
libc-2.10.2.so[381de00000+14a000]
[ 1948.709301] :events/0[13683]: segfault at 7f6e5449d6a8 ip
000000381de46e4b sp 00007f6e5449d6b0 error
6
[ 1948.709308] in
libc-2.10.2.so[381de00000+14a000]
[ 2000.919905] :events/0[13860]: segfault at 7fccf062b6a8 ip
000000381de46e4b sp 00007fccf062b6b0 error
6
[ 2000.919910] :<unknown>[13859]: segfault at 7fccf062f6a8 ip
000000381de46e4b sp 00007fccf062f6b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[
2000.919919]
[ 2027.356686] :<unknown>[14060]: segfault at 7f40f88046a8 ip
000000381de46e4b sp 00007f40f88046b0 error
6
[ 2027.356693] :events/0[14061]: segfault at 7f40f88006a8 ip
000000381de46e4b sp 00007f40f88006b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[
2027.356704]
[ 2067.677990] :mplayer[14225]: segfault at 7fa7fed8c6a8 ip
000000381de46e4b sp 00007fa7fed8c6b0 error
6
[ 2067.677996] :sync_supers[14237]: segfault at 7fa7fed5c6a8 ip
000000381de46e4b sp 00007fa7fed5c6b0 error 6
[ 2067.678002] :klipper[14224]: segfault at 7fa7fed906a8 ip
000000381de46e4b sp 00007fa7fed906b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[
2067.678009]
[ 2067.678014] in
libc-2.10.2.so[381de00000+14a000]
[ 2067.678102] :kondemand/0[14231]: segfault at 7fa7fed746a8 ip
000000381de46e4b sp 00007fa7fed746b0 error 6
[ 2067.678119] :gkrellm[14228]: segfault at 7fa7fed806a8 ip
000000381de46e4b sp 00007fa7fed806b0 error
6
[ 2067.678123] :flush-253:2[14235]: segfault at 7fa7fed646a8 ip
000000381de46e4b sp 00007fa7fed646b0 error 6
[ 2067.678127] :Xorg[14229]: segfault at 7fa7fed7c6a8 ip
000000381de46e4b sp 00007fa7fed7c6b0 error
6
[ 2067.678131] :events/0[14236]: segfault at 7fa7fed606a8 ip
000000381de46e4b sp 00007fa7fed606b0 error
6
[ 2067.678136] :md4_raid10[14238]: segfault at 7fa7fed586a8 ip
000000381de46e4b sp 00007fa7fed586b0 error 6
[ 2067.678147] :events/1[14221]: segfault at 7fa7fed9c6a8 ip
000000381de46e4b sp 00007fa7fed9c6b0 error 6 in
libc-2.10.2.so[381de00000+14a000]
[ 2067.678210] in libc-2.10.2.so[381de00000+14a000]
[ 2067.678220] in libc-2.10.2.so[381de00000+14a000]
[ 2067.678225] in libc-2.10.2.so[381de00000+14a000]
[ 2067.678235] in libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[ 2067.678239]
[ 2067.678253] in libc-2.10.2.so[381de00000+14a000]
[ 2079.333421] __ratelimit: 10 callbacks suppressed
[ 2079.333426] :kondemand/1[14266]: segfault at 7fd0006d66a8 ip
000000381de46e4b sp 00007fd0006d66b0 error 6
[ 2079.333432] :<unknown>[14265]: segfault at 7fd0006da6a8 ip
000000381de46e4b sp 00007fd0006da6b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in libc-2.10.2.so[381de00000+14a000]
[ 2079.333445]
[ 2107.078219] :<unknown>[14304]: segfault at 7f173a7ac6a8 ip
000000381de46e4b sp 00007f173a7ac6b0 error 6
[ 2107.078224] :events/2[14308]: segfault at 7f173a79c6a8 ip
000000381de46e4b sp 00007f173a79c6b0 error 6
[ 2107.078231] :flush-253:2[14305]: segfault at 7f173a7a86a8 ip
000000381de46e4b sp 00007f173a7a86b0 error 6 in
libc-2.10.2.so[381de00000+14a000]
[ 2107.078237] in libc-2.10.2.so[381de00000+14a000] in
libc-2.10.2.so[381de00000+14a000]
[ 2107.078242]
[ 2462.674266] :ksoftirqd/3[15860]: segfault at 7fd9cd0a66a8 ip
000000381de46e4b sp 00007fd9cd0a66b0 error 6
[ 2462.674273] :swapper[15859]: segfault at 7fd9cd0aa6a8 ip
000000381de46e4b sp 00007fd9cd0aa6b0 error 6 in
libc-2.10.2.so[381de00000+14a000] in libc-2.10.2.so[381de00000+14a000]
[ 2462.674287] :lighttpd[15861]: segfault at 7fd9cd0a26a8 ip
000000381de46e4b sp 00007fd9cd0a26b0 error 6
[ 2462.674292] in libc-2.10.2.so[381de00000+14a000]
[ 2462.674295]
[ 2462.674432] :konsole[15858]: segfault at 7fd9cd0ae6a8 ip
000000381de46e4b sp 00007fd9cd0ae6b0 error 6 in
libc-2.10.2.so[381de00000+14a000]
However the events/[0-3] processes are still running, some of the others
not anymore (like swapper).
Best regards,
--Edwin
View attachment "config-2.6.32" of type "text/plain" (59580 bytes)
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