linux-kernel - Re: [PATCH]: arm64: factor work

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Message-ID: <20160711121953.GH31221@leverpostej>
Date:	Mon, 11 Jul 2016 13:19:53 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	Chris Metcalf <cmetcalf@...lanox.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]: arm64: factor work_pending state machine to C

On Mon, Jul 11, 2016 at 12:42:37PM +0100, Will Deacon wrote:
> On Fri, Jul 08, 2016 at 04:49:01PM +0100, Will Deacon wrote:
> > On Fri, Jul 08, 2016 at 11:43:50AM -0400, Chris Metcalf wrote:
> > > I am hopeful that this patch [1] can be picked up for the 4.8 merge window
> > > in the arm64 tree.  As I mentioned in my last patch series that included
> > > this patch [2], I'm hopeful that this version addresses the performance
> > > issues that were seen with Mark's original patch.  This version tests the
> > > TIF flags prior to calling out to the loop in C code.
> > 
> > I still need to get round to measuring that again. This might also
> > conflict with a late fix I just sent for 4.7.
> 
> FWIW, I've failed to measure any performance overhead from this change,
> so it certainly looks better thsn Mark's original patch from that angle.

FWIW, likewise, with perf bench sched atop of v4.7-rc6.

Mark.