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From: Peter Zijlstra <peterz@infradead.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki Poulose <Suzuki.Poulose@arm.com>,
	Will Deacon <Will.Deacon@arm.com>,
	"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
	"acme@kernel.org" <acme@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Punit Agrawal <Punit.Agrawal@arm.com>,
	Pawel Moll <Pawel.Moll@arm.com>
Subject: Re: [PATCH 1/3] arm/pmu: Reject groups spanning multiple hardware PMUs
Date: Tue, 10 Mar 2015 14:00:41 +0100	[thread overview]
Message-ID: <20150310130041.GC11574@worktop.ger.corp.intel.com> (raw)
In-Reply-To: <20150310125351.GD2896@worktop.programming.kicks-ass.net>

On Tue, Mar 10, 2015 at 01:53:51PM +0100, Peter Zijlstra wrote:
> > It would be nicer if we could prevent this in the core so we're not
> > reliant on every PMU driver doing the same verification. My initial
> > thought was that seemed like unnecessary duplication of the ctx checking
> > above, but if we're going to end up shoving it into several drivers
> > anyway perhaps it's the lesser evil.
> 
> Again, agreed, that would be better and less error prone. But I'm not
> entirely sure how to go about doing it :/ I'll have to go think about
> that; and conferences are not the best place for that.
> 
> Suggestions on that are welcome of course ;)

So the problem is that event_init() is what will return the pmu, so we
cannot make decisions on it until after that returns.

Maybe we can pull out the validate step into its own funciton;
pmu->validate() or whatnot, to be called slightly later.

  reply	other threads:[~2015-03-10 13:00 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
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 [this message]
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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