linux-kernel - Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call

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Date:	Tue, 06 Mar 2012 11:47:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine
 call_srcu()

On Tue, 2012-03-06 at 17:57 +0800, Lai Jiangshan wrote:
> o       The srcu callback is new thing, I hope it is completely preemptible,
>         even sleepable. It does in this implemetation, I use work_struct
>         to stand for every srcu callback. 

I didn't need the callbacks to sleep too, I just needed the read-side
srcu bit.

There's an argument against making the callbacks able to sleep like that
in that you typically want to minimize the amount of work done in the
callbacks, allowing them to sleep invites to callbacks that do _way_ too
much work.

I haven't made my mind up if I care yet.. :-)
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