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SubjectRe: [PATCH] tracing: print function names instead of just address
On Sun, 10 Feb 2019 00:19:19 +0800
Changbin Du <changbin.du@gmail.com> 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).

-- 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 <changbin.du@gmail.com>
> ---
> kernel/trace/trace_entries.h | 41 +++++++++++++++++-------------------
> 1 file changed, 19 insertions(+), 22 deletions(-)
>
>

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