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

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Message-ID: <20131004144319.GM3081@twins.programming.kicks-ass.net>
Date:	Fri, 4 Oct 2013 16:43:19 +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 03:31:35PM +0200, Oleg Nesterov wrote:
> > I'm really starting to think we shouldn't do this in rcu_sync at all.
> 
> I do not really understand why you insist that rcu_sync() should not
> try to help to the users which need the exclusive mode.

But what other users; you yourself said that percpu-rwsem isn't one for
long if ever.
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