linux-kernel - Re: [PATCH 2/3] rcu: Create rcu

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Message-ID: <20131004113607.GI3081@twins.programming.kicks-ass.net>
Date:	Fri, 4 Oct 2013 13:36:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] rcu: Create rcu_sync infrastructure

On Fri, Oct 04, 2013 at 01:15:13PM +0200, Oleg Nesterov wrote:
> Of course we can fix this, but wait_for_completion/complete already
> does the necessary work: x->done acts as a resource counter which is
> always checked/incremented/decremented under the same lock.

Urgh, so now you're not using a semaphore as completion but using a
completion as semaphore.


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