linux-kernel - Re: [PATCH v4 00/17] 64-bit friendly generic sched

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Message-ID: <20131002174700.GF30298@mudshark.cambridge.arm.com>
Date:	Wed, 2 Oct 2013 18:47:00 +0100
From:	Will Deacon <will.deacon@....com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Christopher Covington <cov@...eaurora.org>,
	Barry Song <Baohua.Song@....com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jingchang Lu <b35083@...escale.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH v4 00/17] 64-bit friendly generic sched_clock()

On Fri, Jul 19, 2013 at 12:59:44AM +0100, John Stultz wrote:
> On 07/18/2013 04:21 PM, Stephen Boyd wrote:
> > This patchset adds support for 64 bit counters in the generic
> > sched_clock code and converts drivers over to use it. Based
> > on v3.11-rc1.
> >
> > Changes since v3:
> >   * Move to use seqcount to fix issues with 64-bit cyc counters
> >   * Move to hrtimer to fix underflow/overflow errors in wraparound
> >     calculation
> >   * Use of 1 hour in clocks_calc_mult_shift
> >   * Converted over drivers in drivers/clocksource
> 
> I've not been able to take a deep review yet, but this looks pretty much 
> like what we discussed last week, so I'm happy with it so far. Has this 
> gotten much testing (on both 32 and 64bit systems?)
> 
> One detail: Most of this is likely to go in via tip/timers/core, but the 
> 5/17 "arch_timer: Move to generic sched_clock" will need some 
> synchronization with Catalin to make sure its ok to go in via tip. Not 
> sure what other arm64 changes are pending that would depend or collide 
> with that change.

I wouldn't expect anything more than a trivial Kconfig clash with the arm64
tree, if that.

Will
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