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From: Peter Zijlstra <peterz@infradead.org>
To: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
Cc: will.deacon@arm.com, linux@arm.linux.org.uk, acme@kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, punit.agrawal@arm.com,
	pawel.moll@arm.com, Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 1/3] arm/pmu: Reject groups spanning multiple hardware PMUs
Date: Tue, 10 Mar 2015 12:27:23 +0100	[thread overview]
Message-ID: <20150310112723.GY2896@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <1425905192-10509-2-git-send-email-suzuki.poulose@arm.com>

On Mon, Mar 09, 2015 at 12:46:30PM +0000, Suzuki K. Poulose wrote:
> From: "Suzuki K. Poulose" <suzuki.poulose@arm.com>
> 
> Don't allow grouping hardware events from different PMUs
>  (eg. CCI + CPU).

Uhm, how does this work? If we have multiple hardware PMUs we'll stop
scheduling events after the first failed event schedule. This can leave
one of the PMUs severely under utilized.

  reply	other threads:[~2015-03-10 11:27 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-09 12:46 [PATCH 0/3] [4.0] arm/arm64: Do not group hardware events from different PMUs Suzuki K. Poulose
2015-03-09 12:46 ` [PATCH 1/3] arm/pmu: Reject groups spanning multiple hardware PMUs Suzuki K. Poulose
2015-03-10 11:27   ` Peter Zijlstra [this message]
2015-03-10 12:00     ` Suzuki K. Poulose
2015-03-10 12:05     ` Mark Rutland
2015-03-10 12:53       ` Peter Zijlstra
2015-03-10 13:00         ` Peter Zijlstra
2015-03-10 13:57           ` Mark Rutland
2015-03-10 14:05           ` Suzuki K. Poulose
2015-03-10 15:09             ` Mark Rutland
2015-03-10 15:36         ` Mark Rutland
2015-03-10 15:44           ` Peter Zijlstra
2015-03-09 12:46 ` [PATCH 2/3] arm64/pmu: Reject groups spanning multiple HW PMUs Suzuki K. Poulose
2015-03-09 12:46 ` [PATCH 3/3] arm-cci: " Suzuki K. Poulose
  -- strict thread matches above, loose matches on Subject: below --
2015-03-09 12:43 [PATCH 0/3] [4.0] arm/arm64: Do not group hardware events from different PMUs a
2015-03-09 12:43 ` [PATCH 1/3] arm/pmu: Reject groups spanning multiple hardware PMUs a

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