linux-kernel - Re: [RFC][PATCH 00/32] Nohz cpusets v2 (adaptive tickless kernel)

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Message-ID: <20120330004527.GB2571@somewhere.redhat.com>
Date:	Fri, 30 Mar 2012 02:45:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Kevin Hilman <khilman@...com>, Geoff Levand <geoff@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linaro-sched-sig@...ts.linaro.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Hemminger <shemminger@...tta.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Ingo Molnar <mingo@...nel.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Avi Kivity <avi@...hat.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Zen Lin <zen@...nhuawei.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 00/32] Nohz cpusets v2 (adaptive tickless kernel)

On Thu, Mar 29, 2012 at 05:33:46PM -0700, Kevin Hilman wrote:
> Frederic Weisbecker <fweisbec@...il.com> writes:
> 
> > There are still a lot of things to handle. Especially about
> > what is done by scheduler_tick() but we also need to:
> >
> > - completely handle cputime accounting (need to find every "reader"
> > of cputime and flush cputimes for all of them).
> > -handle  perf
> > - handle irqtime finegrained accounting
> > - handle ilb load balancing
> > - etc...
> 
>   - add more arch support :)
> 
> For ARM, I've started hacking things into place and have some
> preliminary patches to add ARM support for the new IPI, syscall support,
> exception hooks, etc.[1]
> 
> This is enough to get some basic things running and test the nohz
> cpusets functionality on ARM, and for others to start trying it out.
> 
> For anyone interested in collaborating on ARM support, my
> work-in-progress branch is below[1] based on Frederic's cpuset-v2
> branch.  Patches and testing welcome.
> 
> Kevin
> 
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux.git wip/arm-nohz-cpusets

Nice! Thanks for working on this. You may want to work with Geoff Levand who's working
on the ARM port too.
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