Em Fri, Oct 14, 2011 at 03:25:49PM -0600, David Ahern escreveu: > > > On 10/14/2011 12:36 AM, Roland Dreier wrote: > > Anyway, suppose I have a multithreaded userspace app that uses a bunch of > > pthread_mutexes, and I want to figure out which locks are hot and/or heavily > > contended. What's the best way to do that? Is perf the right, or is there > > something better? (This seems like such an obvious thing to want that there > > must be some good way to get this data, I hope) > > You can capture futex entry and exit with: > > perf trace -e syscalls:sys_enter_futex -e syscalls:sys_exit_futex > > add -g to get the callchains. From there perf-script will dump the events.
Right, if userspace was compiled with -fno-omit-frame-pointer, instant karma :-) With what we have now in tip/master: perf top -G And enjoy it live :-) - Arnaldo -- 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
