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From: Tejun Heo <tj@kernel.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [RFC] Sharing PMU counters across compatible events
Date: Wed, 13 Dec 2017 08:15:19 -0800	[thread overview]
Message-ID: <20171213161519.GU3919388@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <20171213101807.GA2883@krava>

Hello, Jiri.

On Wed, Dec 13, 2017 at 11:18:07AM +0100, Jiri Olsa wrote:
> so I can see this to be useful for HW conters only, because
> of limited number of regs
> 
> as for the higher level on which this could be implemented I
> see some pitfals with event rotations as Peter mentioned and
> task/cpu contexts scheduling.. while the hw-level implementation
> seems pretty straight forward

Heh, yeah, maybe.  

> I'll test the code and let's see ;-)

Thanks.  I'll think more about it and see whether this can be evolved
into something useable.

Thanks.

-- 
tejun

  reply	other threads:[~2017-12-13 16:15 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-01 14:19 [RFC] Sharing PMU counters across compatible events Tejun Heo
2017-12-06 11:42 ` Jiri Olsa
2017-12-11 15:34   ` Tejun Heo
2017-12-13 10:18     ` Jiri Olsa
2017-12-13 16:15       ` Tejun Heo [this message]
2017-12-06 12:35 ` Peter Zijlstra
2017-12-11 15:47   ` Tejun Heo
2017-12-12 22:37     ` Peter Zijlstra
2017-12-13 16:18       ` Tejun Heo

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