linux-kernel - Re: [RFC] introduce synchronize_sched

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Message-ID: <20130930150653.GL26785@twins.programming.kicks-ass.net>
Date:	Mon, 30 Sep 2013 17:06:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	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>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC] introduce synchronize_sched_{enter,exit}()

On Mon, Sep 30, 2013 at 04:24:00PM +0200, Peter Zijlstra wrote:
> For that we'd have to decrement xxx->gp_count from cb_rcu_func(),
> wouldn't we?
> 
> Without that there's no guarantee the fast path readers will have a MB
> to observe the write critical section, unless I'm completely missing
> something obviuos here.

Duh.. we should be looking at gp_state like Paul said.
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