linux-kernel - Re: [PATCH 1/2] perf: Introduce new perf_save

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Message-ID: <4B913A83.4040805@redhat.com>
Date:	Fri, 05 Mar 2010 12:08:19 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	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>,
	Jason Baron <jbaron@...hat.com>,
	Archs <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf: Introduce new perf_save_regs() for hot regs
 snapshot

Frederic Weisbecker wrote:
> On Fri, Mar 05, 2010 at 10:08:07AM -0500, Masami Hiramatsu wrote:
>>> +void perf_arch_save_regs(struct pt_regs *regs, unsigned long ip, int skip)
>>
>> Hmm, why would you call it 'save_regs' ?
>> It seems that this function is just for fixing registers 
>> instead of saving it into somewhere...
>>
>> Thank you,
> 
> 
> Hmm, save_regs() describes what it does: you pass
> a pt_regs and it saves registers inside. But it
> has also a kind of fixup thing as it also rewinds.

Ah, I see. so this saves current register values
into pt_regs. :)

> 
> I'm not sure using a fixup thing for the naming
> is correct as we are not starting with initial
> regs passed to the function (just a raw buffer).
> 
> What about perf_save_caller_regs() ?
> 

Hmm, I think, it might be better perf_get_caller_regs()
or something like that (fetch ?). 

Thank you,


-- 
Masami Hiramatsu
e-mail: mhiramat@...hat.com
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