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    SubjectRe: [RFC][PATCH] Make ftrace able to trace function return

    On Fri, 31 Oct 2008, Fr?d?ric Weisbecker wrote:

    > 2008/10/30 Steven Rostedt <rostedt@goodmis.org>:
    > > What about storing the return addresses on the bottom of the stack?
    > > That is, start at task->stack + sizeof(thread_info), and stack up on that.
    > > Be careful, there might already be users of that area. This will also need
    > > to be arch dependent.
    >
    > But how could I assume there is enough space behind this address to store a long
    > stack of functions calls for a same thread?
    > And if an interrupt is raised, would a reference to "current task" be
    > really consistant?
    >
    > I don't know much about the bottom stack of the tasks, I'm not sure
    > about how much
    > space I can use inside... I should study this field. Who could be the
    > potential users of this area?
    >

    Because it is the real stack ;-)

    Before adding, test to see if the real stack pointer is getting close. If
    it is, then there's probably more issues. You can run the stack_tracer to
    see how much stack is available too.

    -- Steve



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