perf timechart segfault
From: Sitsofe Wheeler
Date: Sun Oct 24 2010 - 12:23:32 EST
Hi,
I've run into a couple of issues using perf timechart:
1. (On 2.6.36) If I issue
echo 0 > /proc/sys/kernel/perf_event_paranoid
as root before running
perf timechart record echo
as a normal user the following is printed:
Fatal: Permission error - are you root?
Consider tweaking /proc/sys/kernel/perf_event_paranoid.
Shouldn't it just say it needs root permissions for a timechart
record?
2. (On -tip) Running
perf timechart record echo
outputs
invalid or unsupported event: 'power:power_start'
Run 'perf list' for a list of valid events
3. (On 2.6.36) I can't seem to convince timechart to ever capture more
than 34000 samples. When trying to record using
perf timechart record -fga sleep 10
and then creating a graph using perf timechart, it only ever outputs
a few seconds worth.
--
Sitsofe | http://sucs.org/~sits/
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/