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    SubjectRe: [PATCH] ftrace: add kernel command line graph function filtering
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    On Mon, 2009-10-12 at 11:09 +0200, Frédéric Weisbecker wrote:
    > 2009/10/12 Stefan Assmann <sassmann@redhat.com>:
    > > From 894e934e782ddaa33eb6d156d8326cdf479b5f62 Mon Sep 17 00:00:00 2001
    > > From: Stefan Assmann <sassmann@redhat.com>
    > > Date: Mon, 12 Oct 2009 09:11:47 +0200
    > > Subject: [PATCH] ftrace: add kernel command line graph function filtering
    > >
    > > Add a command line parameter to allow limiting the function graphs that
    > > are traced on boot up, when ftrace=function_graph is specified.
    > >
    > > This patch adds the following command line option:
    > > ftrace_graph_filter=function-list
    >
    >
    > If we use this parameter, we undoubtedly want to launch the function
    > graph tracer.
    > I'd then suggest to arm ftrace=function_graph automatically if we have
    > ftrace_graph_filter
    > set.
    >

    Actually, I disagree. I may just be lazy, and want to set up the
    function graph to a particular set of functions. It doesn't mean I want
    to run the function_graph tracer on boot up.

    This is the same reason I don't automatically set up ftrace=function
    when the filter and notrace functions are set.

    -- Steve


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