On Friday 19 September 2014 08:17:47 David Ahern wrote: > On 9/18/14, 2:36 PM, Arnaldo Carvalho de Melo wrote: > > Ok, so you want to see what is the wait channel and unwind the stack > > from there? Is that the case? I.e. again, a sysrq-t equivalent? > > > >> Milian want is to grab samples every timer expiration even if process is > >> not running. > > > > What for? And by "grab samples" you want to know where it is waiting for > > something, together with its callchain? > > > >> Any limitations that would prevent doing this with a sw event? e.g, mimic > >> task-clock just don't disable the timer when the task is scheduled out. > > > > I'm just trying to figure out if what people want is a complete > > backtrace of all threads in a process, no matter what they are doing, at > > some given time, i.e. at "sysrq-t" time, is that the case? > > This has been discussed before: > http://thread.gmane.org/gmane.linux.kernel/1307306 > > Example on the perf wiki: > https://perf.wiki.kernel.org/index.php/Tutorial#Profiling_sleep_times
Right, I also mentioned this in my initial email. This is _not_ what I want though :) Bye -- Milian Wolff [email protected] http://milianw.de -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
