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

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Message-ID: <20131004071814.GS28601@twins.programming.kicks-ass.net>
Date:	Fri, 4 Oct 2013 09:18:14 +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 Thu, Oct 03, 2013 at 11:10:09PM +0200, Oleg Nesterov wrote:
> On 10/03, Oleg Nesterov wrote:
> >
> > So unless Peter objects I'll write the changelogs (always nontrivial task),
> > test, and send these 2 patches + "add ops->barr() / rcu_sync_wait_for_cb"
> > tomorrow.
> 
> And, can't resist, probably another patch below (incomplete, needs the
> obvious change in cpu.c and the new trivial __complete_locked() helper).
> 
> Hmm. But when I look at wait_for_completion() I think it is buggy. Will
> try to send the fix tomorrow.
> 
> Oleg.
> 
> rcusync: introduce rcu_sync_struct->exclusive mode

What's exclusive to mean? One writer at a time? Why don't use use the
waitqueue in exclusive mode and use a single wake_up instead of
wake_up_all()?

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