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SubjectRe: [PATCH 2/2] ftrace: add stack trace to function tracer

* Steven Rostedt <rostedt@goodmis.org> wrote:

> From: Steven Rostedt <srostedt@redhat.com>
>
> Impact: new feature to stack trace any function
>
> Chris Mason asked about being able to pick and choose a function
> and get a stack trace from it. This feature enables his request.
>
> # echo io_schedule > /debug/tracing/set_ftrace_filter
> # echo function > /debug/tracing/current_tracer
> # echo func_stack_trace > /debug/tracing/trace_options
>
> Produces the following in /debug/tracing/trace:
>
> kjournald-702 [001] 135.673060: io_schedule <-sync_buffer
> kjournald-702 [002] 135.673671:
> <= sync_buffer
> <= __wait_on_bit
> <= out_of_line_wait_on_bit
> <= __wait_on_buffer
> <= sync_dirty_buffer
> <= journal_commit_transaction
> <= kjournald

neat!

Ingo


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