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Date
SubjectRe: [PATCH 2/2] ftrace: support for PowerPC
From
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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