linux-kernel - Re: [PATCH 09/14] perf, x86: use LBR for PEBS IP+1 fixup

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Message-ID: <4B901F06.1010106@redhat.com>
Date:	Thu, 04 Mar 2010 15:58:46 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	eranian@...gle.com, robert.richter@....com, fweisbec@...il.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH 09/14] perf, x86: use LBR for PEBS IP+1 fixup

Masami Hiramatsu wrote:
> Peter Zijlstra wrote:
>> On Thu, 2010-03-04 at 11:21 -0500, Masami Hiramatsu wrote:
>>> Peter Zijlstra wrote:
>>
>>>> +#define perf_misc_flags(regs)				\
>>>> +({	int misc = 0;					\
>>>> +	if (user_mode(regs))				\
>>>> +		misc |= PERF_RECORD_MISC_USER;		\
>>>> +	else						\
>>>> +		misc |= PERF_RECORD_MISC_KERNEL;	\
>>>> +	if (regs->flags & PERF_EFLAGS_EXACT)		\
>>>> +		misc |= PERF_RECORD_MISC_EXACT;		\
>>>> +	misc; })
>>>> +
>>>> +#define perf_instruction_pointer(regs)	((regs)->ip)
>>>
>>> Hmm, why don't you use instruction_pointer() defined in asm/ptrace.h?
>>> And I couldn't find any user of this macro in this patch...
>>
>> perf_instruction_pointer() is used in kernel/perf_event.c, and yeah I
>> could have used instruction_pointer() but that's yet another wrapper.
>>
>> Anyway, Yanmin is poking at doing kvm-guest profiling and will likely
>> rewrite all of the perf_misc() and perf_instruction_pointer() stuff
>> soon.
> 
> Hmm, still I can't find where it is used (in your patches).

Ah, OK. that is already used in kernel/perf_event.c and
the patch overwrites one defined in include/linux/perf_event.h.

Reviewed-by: Masami Hiramatsu <mhiramat@...hat.com>

Thank you,


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