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    SubjectRe: [PATCH 2/2] ftrace: support for PowerPC
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    From: Steven Rostedt <rostedt@goodmis.org>
    Date: Wed, 14 May 2008 23:49:44 -0400

    > +#ifdef CONFIG_FTRACE
    > +#ifdef CONFIG_DYNAMIC_FTRACE
    > +_GLOBAL(mcount)
    > +_GLOBAL(_mcount)
    > + stwu r1,-48(r1)
    > + stw r3, 12(r1)
    > + stw r4, 16(r1)
    > + stw r5, 20(r1)
    > + stw r6, 24(r1)
    > + mflr r3
    > + stw r7, 28(r1)
    > + mfcr r5
    > + stw r8, 32(r1)
    > + stw r9, 36(r1)
    > + stw r10,40(r1)
    > + stw r3, 44(r1)
    > + stw r5, 8(r1)

    Yikes, that's really expensive.

    Can't you do a tail call and let the function you end
    up calling do all the callee-saved register pops onto
    the stack?

    That's what I did on sparc.


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