linux-kernel - Re: [RFC][PATCH 2/3] perf: Take a hot regs snapshot for trace events

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Message-ID: <20100304190135.GA28830@nowhere>
Date:	Thu, 4 Mar 2010 20:01:40 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Paul Mackerras <paulus@...ba.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC][PATCH 2/3] perf: Take a hot regs snapshot for trace
	events

On Wed, Mar 03, 2010 at 09:38:49AM +0100, Peter Zijlstra wrote:
> On Wed, 2010-03-03 at 07:55 +0100, Frederic Weisbecker wrote:
> >  /*
> > + * Hot regs snapshot support -- arch specific
> > + * This needs to be a macro because we want the current
> > + * frame pointer.
> > + */
> > +#ifndef PERF_SAVE_REGS
> > +#define PERF_SAVE_REGS(regs)   memset(regs, 0, sizeof(*regs));
> > +#endif
> 
> It would be nice to have the fallback at least set the current or
> calling IP, now you've basically wrecked stuff for everything !x86.


Actually I can't, as there doesn't seem to be a way to write
regs->ip in a generic way :-s

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