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

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Message-Id: <58ED971B-CC04-4BE1-916C-386D219874A8@arm.com>
Date:	Sat, 26 Apr 2014 10:23:05 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Ding Tianhong <dingtianhong@...wei.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 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--
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