linux-kernel - Re: [PATCH] lglock: add read-preference local-global rwlock

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Message-ID: <20130302170656.GB29769@redhat.com>
Date:	Sat, 2 Mar 2013 18:06:56 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Lai Jiangshan <eag0628@...il.com>, linux-doc@...r.kernel.org,
	peterz@...radead.org, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	mingo@...nel.org, linux-arch@...r.kernel.org,
	linux@....linux.org.uk, xiaoguangrong@...ux.vnet.ibm.com,
	wangyun@...ux.vnet.ibm.com, paulmck@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	rusty@...tcorp.com.au, rostedt@...dmis.org, rjw@...k.pl,
	vincent.guittot@...aro.org, tglx@...utronix.de,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	sbw@....edu, tj@...nel.org, akpm@...ux-foundation.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] lglock: add read-preference local-global rwlock

On 03/02, Michel Lespinasse wrote:
>
> My version would be slower if it needs to take the
> slow path in a reentrant way, but I'm not sure it matters either :)

I'd say, this doesn't matter at all, simply because this can only happen
if we race with the active writer.

Oleg.

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