linux-kernel - Re: [RFC PATCH 01/11] Add basic support for gcc profiler instrumentation

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Message-ID: <Pine.LNX.4.58.0801031413410.5746@gandalf.stny.rr.com>
Date:	Thu, 3 Jan 2008 14:15:13 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Chris Wright <chrisw@...hat.com>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"William L. Irwin" <sparclinux@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH 01/11] Add basic support for gcc profiler instrumentation


On Thu, 3 Jan 2008, Chris Wright wrote:

>
> Yes, paravirt ops have a well-specified calling convention (register
> based).  There was a cleanup that Andi did that caused the problem
> because it removed all the "fastcall" annotations since -mregparm=3
> is now always on for i386.  Since MCOUNT disables REGPARM the calling
> convention changes (caller pushes to stack, callee expects register)
> chaos ensues.  I sent a patch to fix that quite some months back, but
> it went stale and I neglected to update it.  Would you like me to dig
> it up refresh and resend?

Chris, thanks for the refresher.

I'm going to see if we can remove the REGPARM hack and change the way
mcount does its calls. Maybe this will fix things for us.

-- Steve

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