On Mon, Feb 11, 2019 at 02:55:32PM -0500, Steven Rostedt wrote: > On Sun, 10 Feb 2019 00:19:19 +0800 > Changbin Du <[email protected]> wrote: > > > Here is an example for this change. > > > > $ sudo perf record -e 'ftrace:function' --filter='ip==schedule' > > $ sudo perf report > > I took this but changed the subject as it only affects perf (the kernel > doesn't use the format field for output, and trace-cmd has an internal > plugin that overrides it too). > Thanks. You explained why I can't find the usage for the other entries. I was looking for it before... :)
> -- Steve > > > > > The output of perf before this patch: > > > > \# Samples: 100 of event 'ftrace:function' > > \# Event count (approx.): 100 > > \# > > \# Overhead Trace output > > \# ........ ...................................... > > \# > > 51.00% ffffffff81f6aaa0 <-- ffffffff81158e8d > > 29.00% ffffffff81f6aaa0 <-- ffffffff8116ccb2 > > 8.00% ffffffff81f6aaa0 <-- ffffffff81f6f2ed > > 4.00% ffffffff81f6aaa0 <-- ffffffff811628db > > 4.00% ffffffff81f6aaa0 <-- ffffffff81f6ec5b > > 2.00% ffffffff81f6aaa0 <-- ffffffff81f6f21a > > 1.00% ffffffff81f6aaa0 <-- ffffffff811b04af > > 1.00% ffffffff81f6aaa0 <-- ffffffff8143ce17 > > > > After this patch: > > > > \# Samples: 36 of event 'ftrace:function' > > \# Event count (approx.): 36 > > \# > > \# Overhead Trace output > > \# ........ ............................................ > > \# > > 38.89% schedule <-- schedule_hrtimeout_range_clock > > 27.78% schedule <-- worker_thread > > 13.89% schedule <-- schedule_timeout > > 11.11% schedule <-- smpboot_thread_fn > > 5.56% schedule <-- rcu_gp_kthread > > 2.78% schedule <-- exit_to_usermode_loop > > > > Signed-off-by: Changbin Du <[email protected]> > > --- > > kernel/trace/trace_entries.h | 41 +++++++++++++++++------------------- > > 1 file changed, 19 insertions(+), 22 deletions(-) > > > > -- Cheers, Changbin Du
