On Wed, 28 Nov 2018 15:39:31 -0500
Joe Lawrence <joe.lawrence@xxxxxxxxxx> wrote:
> Hi Steve,
>
> With your ftrace/urgent branch linked above, if I try a quick
> function_graph test like the following:
>
> SYSFS=/sys/kernel/debug/tracing
>
> echo 0 > "$SYSFS/tracing_on"
> echo cmdline_proc_show > "$SYSFS/set_graph_function"
> echo function_graph > "$SYSFS/current_tracer"
> echo 1 > "$SYSFS/tracing_on"
>
> I see a bunch of scheduler interrupt functions in the trace/trace_pipe
> without even invoking cmdline_proc_show().
>
> This tests works as expected with Linux 4.20-rc3 though:
>
> % cat /sys/kernel/debug/tracing/trace_pipe
> 2) | cmdline_proc_show() {
> 2) 0.320 us | seq_puts();
> 2) 0.030 us | seq_putc();
> 2) 1.352 us | }
>
> Operator error, or did the patchset break something?
Nope, that does seem to be a bug :-/
-- Steve
