Messages in this thread | | | Date | Sat, 13 Dec 2008 02:25:16 +0100 | From | "Frédéric Weisbecker" <> | Subject | Re: [PATCH][RFC 2/23]: SCST core |
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2008/12/13 Arnaldo Carvalho de Melo <acme@redhat.com>: > Steven, is it possible to trigger tracing for any function when a > function in the list set up by the user is running and then stop tracing > when it exits? > > - Arnaldo >
Hi Arnaldo,
Yes it's possible with ftrace, by using the function graph tracer ( an ftrace extension that adds the tracing on return).
To enable it just do: echo function_graph > /debugfs/tracing/current_tracer
And to trace by choosing a particular function as the root of the call stack, just do the things explained on this patch: http://git.kernel.org/?p=linux/kernel/git/mingo/linux-2.6-sched-devel.git;a=commit;h=ea4e2bc4d9f7370e57a343ccb5e7c0ad3222ec3c
And the tracing will finish after this function returns :-)
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