linux-kernel - Re: [PATCH 1/4] tile: Add support for handling PMC hardware

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Message-ID: <20140306103158.GJ9987@twins.programming.kicks-ass.net>
Date:	Thu, 6 Mar 2014 11:31:58 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tony Lu <zlu@...era.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] tile: Add support for handling PMC hardware

On Thu, Mar 06, 2014 at 10:12:54AM +0000, Tony Lu wrote:
> >One thing I didn't spot is a tile irq_work implementation; perf likes to
> >have one.
> 
> We do not have tile irq_work for now. It seems like perf works fine
> even without the arch irq_work. Anyway, we will investigate it, and
> submit it as a separate patch when it gets ready.

Yeah, it does work; I have a note somewhere there's a race without it,
but I lost the relevant details.

I should probably try and reconstruct and either fix or at least
comment :/
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