Re: [PATCH] trace: reset sleep/block start time on task switch

[Peter Zijlstra]

On Wed, 2012-01-25 at 11:50 -0800, Arun Sharma wrote:
> # perf record -agP -e sched:sched_switch --filter "prev_state == 1 || 
> prev_state == 2" -e  sched:sched_stat_sleep -- sleep 3 

Problem with that is it'll try and do a backtrace for all events, not
only the sched_switch but also sched_stat_sleep, which is completely
superfluous (and expensive).

Currently perf tool doesn't support individual -g flags though and its
slightly non-trivial to make it so. Easiest work-around would be two
records and then merge the two files.

--
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/