linux-kernel - Re: [RFC][PATCH 5/5] percpu-rwsem: Optimize readers and reduce global impact

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Message-ID: <20150529200932.GA2516@redhat.com>
Date:	Fri, 29 May 2015 22:09:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulmck@...ux.vnet.ibm.com, tj@...nel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, der.herr@...r.at, dave@...olabs.net,
	torvalds@...ux-foundation.org
Subject: Re: [RFC][PATCH 5/5] percpu-rwsem: Optimize readers and reduce
	global impact

On 05/29, Oleg Nesterov wrote:
>
> Just one nit below,

Ah, wait, I forgot about the "trivial" percpu_up_write()...

Doesn't it need mb() before "state = readers_slow" to ensure
"release" semantics?

Oleg.

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