Messages in this thread | | | Date | Thu, 22 Dec 2011 13:55:58 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH 7/7] ftrace, perf: Add filter support for function trace event |
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On Wed, Dec 21, 2011 at 11:07:58PM +0100, Frederic Weisbecker wrote: > On Wed, Dec 21, 2011 at 07:56:31PM +0100, Jiri Olsa wrote: > > Adding support to filter function trace event via perf > > interface. It is now possible to use filter interface > > in the perf tool like: > > > > perf record -e ftrace:function --filter="(ip == mm_*)" ls > > > > The filter syntax is restricted to the the 'ip' field only, > > and following operators are accepted '==' '!=' '||', ending > > up with the filter strings like: > > > > "ip == f1 f2 ..." || "ip != f3 f4 ..." ... > > Having the functions seperated like this sort of violates the > grammar of the filtering interface. > > The typical way to do this would have been to stringify the > functions: ip == "f1 f2" > > I feel a bit uncomfortable with "ip == f1 f2" scheme but perhaps > we can live with that. Especially as otherwise that would > require us to type "ip == \"f1 f2\"" for the whole filtering expression.
ugh, just realized there's a problem with this in the patch actually, and it's not working as expected. I'll send out new version soon..
thanks, jirka
> > Thoughts?
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