linux-kernel - Re: [PATCH v9 00/13] support "task_isolation" mode for nohz

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Message-ID: <20160112100708.GA15737@arm.com>
Date:	Tue, 12 Jan 2016 10:07:09 +0000
From:	Will Deacon <will.deacon@....com>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Gilad Ben Yossef <giladb@...hip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 00/13] support "task_isolation" mode for nohz_full

On Mon, Jan 11, 2016 at 04:15:50PM -0500, Chris Metcalf wrote:
> Ping!  There has been no substantive feedback to this version of
> the patch in the week since I posted it, which optimistically suggests
> to me that people may be satisfied with it.  If that's true, Frederic,
> I assume this would be pulled into your tree?
> 
> I have slightly updated the v9 patch series since this posting:
> 
> - Incorporated a fix to initialize cpu_isolation_mask early if no
>   cpu_isolation= boot argument was given, to avoid crashing on
>   CPUMASK_OFFSTACK platforms.
> 
> - Incorporated Mark Rutland's changes to convert arm64
>   assembly to C code instead of using my own version.

Please avoid queuing these patches -- the first is already in the arm64
queue for 4.5 and the second was found to introduce a substantial
performance regression on the syscall entry/exit path. I think Mark had
an updated version to address that, so it would be easier not to have
an old version sitting in some other queue!

Cheers,

Will