linux-kernel - Re: [PATCH] arm64: add OProfile support

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Message-ID: <535B88C9.6000908@huawei.com>
Date:	Sat, 26 Apr 2014 18:22:01 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	Will Deacon <Will.Deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Robert Richter <rric@...nel.org>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"huxinwei@...wei.com" <huxinwei@...wei.com>
Subject: Re: [PATCH] arm64: add OProfile support

On 2014/4/26 17:23, Catalin Marinas wrote:
> On 26 Apr 2014, at 09:38, Ding Tianhong <dingtianhong@...wei.com> wrote:
>> Add OProfile support for arm64,  using the perf backend, and failing back
>> to generic timer based sampling if PMU interrupt is not supported.
>>
>> I have test this patch on Cortex-A53 and Cortex-A57 motherboard, the OProfile
>> could work well by PMU irq or arch timer irq.
> 
> This came up before a few times and we also had an implementation but
> decided not to merge it. We should rather get the user space oprofile to
> use the perf kernel API.
> 
> That’s an old thread, it may have even made it into mainline oprofile
> but I haven’t followed the development:
> 
> http://marc.info/?l=oprofile-list&m=133002515616302&w=2
> 
> Catalin
> 
Ok, I will check it and then decide the next step, thanks for your feedback.

Regards
Ding


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