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

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Message-ID: <CACvQF52tYmG4Bx+L+cTjVRbvQxj=sKiKrxhuv35H=fAFVvQJ2Q@mail.gmail.com>
Date:	Tue, 6 Mar 2012 23:12:12 +0800
From:	Lai Jiangshan <eag0628@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	"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, tj@...nel.org
Subject: Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()

On Tue, Mar 6, 2012 at 7:16 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, 2012-03-06 at 17:57 +0800, Lai Jiangshan wrote:
>>         srcu_head is bigger, it is worth, it provides more ability and simplify
>>         the srcu code.
>
> Dubious claim.. memory footprint of various data structures is deemed
> important. rcu_head is 16 bytes, srcu_head is 32 bytes. I think it would
> be real nice not to have two different callback structures and not grow
> them as large.

CC: tj@...nel.org
It could be better if workqueue also supports 2*sizeof(long) work callbacks.

I prefer ability/functionality a little more, it eases the caller's pain.
preemptible callbacks also eases the pressure of the whole system.
But I'm also ok if we limit the srcu-callbacks in softirq.

>
>
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