linux-kernel - Re: [ANNOUNCE] 3.9-rc1-nohz1

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Message-ID: <CAFTL4hxt5y2hdh0_LNA-08+jNTYwkjeg=QHBfgNf_X_XCHie1w@mail.gmail.com>
Date:	Mon, 11 Mar 2013 00:53:35 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Li Zhong <zhong@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung.kim@....com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Kevin Hilman <khilman@...aro.org>,
	Mats Liljegren <mats.liljegren@...a.com>
Subject: Re: [ANNOUNCE] 3.9-rc1-nohz1

2013/3/9 Ingo Molnar <mingo@...nel.org>:
> We could certainly start tip:sched/dynticks (or tip:timers/dynticks) to accelerate
> the upstream merging of it. Nobody expressed deep concerns with the approach, so
> what is left is some more hard work.

Great to see you're ok with that direction! I'm working on that then.

>
> Two quick requests:
>
>  - Mind adding a Documentation/... file with a high level description,
>    rough design, open problems, etc.?

Sure! We'll maintain that along the way.

>
>  - Please outline how the current TODO entries affect upstream
>    mergability. Does it reduce the 'full'-ness of this dynticks mode?
>    Outright buggy behavior? Other trade-offs?

Mostly this is about upstream features that won't be working with the
current state of the art: enqueuing a posix cpu timer on a nohz CPU
may result in it being ignored by the target due to the lack of
ticking until expiration, perf events may not be round-robined, etc...
I'll make sure to document all these items.

Thanks.
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