linux-kernel - Re: [PATCH v2 07/13] xtensa: implement counting and sampling perf events

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Message-ID: <CAMo8Bf+qsVRc6G3WvrKh0JiJTX64Ae6SxyBLfSFZG7sJLLVOMA@mail.gmail.com>
Date:	Fri, 7 Aug 2015 15:03:02 +0300
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Zankel <chris@...kel.net>,
	Marc Gauthier <marc@...ence.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 07/13] xtensa: implement counting and sampling perf events

On Fri, Aug 7, 2015 at 12:13 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, Aug 06, 2015 at 04:46:32PM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Sat, Jul 18, 2015 at 11:30:10AM +0300, Max Filippov escreveu:
>> > Xtensa Performance Monitor Module has up to 8 32 bit wide performance
>> > counters. Each counter may be enabled independently and can count any
>> > single type of hardware performance events. Event counting may be enabled
>> > and disabled globally (per PMM).
>> > Each counter has status register with bits indicating if the counter has
>> > been overflown and may be programmed to raise profiling IRQ on overflow.
>> > This IRQ is used to rewind counters and allow for counting more than 2^32
>> > samples for counting events and to report samples for sampling events.
>> >
>> > For more details see Tensilica Debug User's Guide, chapter 8
>> > "Performance monitor module".
>>
>> Has this gone via PeterZ? I added the tools/ bits in my perf/core
>> branch, will go in next pull req,
>
> I was thinking it would go through the xtensa tree. Looks fine at a
> quick glance and they can actually test it.

Right, had the same idea.

-- 
Thanks.
-- Max
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