>I think sudo will let you have symbolicated kernel stacks which can be handy.
$ sudo perf record ./firefox .... has a problem: "Running Nightly as root in a regular user's session is not supported." You can work around this with either: $ sudo perf record -g -F 999 -p <pid of process> (this only gets one process of firefox's N processes, though) or $ sudo perf record -g -F 999 sudo -u <user> ./firefox -P whatever -no-remote However: you may find that the extra detail doesn't help much. Normally, I just use user-space profiling: $ perf record -g -F 999 ./firefox -P my-profile -no-remote $ perf script -F +pid > /tmp/firefox.perf Note that you'll want /proc/sys/kernel/perf_event_paranoid to be 1 (or less). To persist across reboots: sudo sh -c 'echo kernel.perf_event_paranoid=1 >> /etc/sysctl.d/99.local.conf' (or add to /etc/sysctl.conf, etc - whatever is correct for your system) -- Randell Jesup, Mozilla Corp remove "news" for personal email _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
