Messages in this thread | | | Date | Fri, 16 Jan 2009 12:19:54 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2] ftrace: add stack trace to function tracer |
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* 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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