linux-kernel - Re: synchronize_qrcu

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Message-ID: <20070625214246.GC2051@elf.ucw.cz>
Date:	Mon, 25 Jun 2007 23:42:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Uli Luckas <u.luckas@...d.de>, linux-kernel@...r.kernel.org
Subject: Re: synchronize_qrcu_timeout()

On Mon 2007-06-25 19:49:57, Oleg Nesterov wrote:
> On 06/25, Oleg Nesterov wrote:
> >
> > On 06/25, Paul E. McKenney wrote:
> > >
> > > On Mon, Jun 25, 2007 at 02:43:32PM +0400, Oleg Nesterov wrote:
> > > > 
> > > > Sadly, you can't use srcu/qrcu because it doesn't handle timeouts.	
> > > 
> > > Interesting...  So the thought is to have a synchronize_srcu_timeout()
> > > or something similar that waited for a grace period to elapse or for
> > > a timeout to expire, whichever comes first?  It should not be too hard
> > > to arrange something, if needed.
> > 
> > Yes. As for qrcu (see http://marc.info/?t=116484476500001), I think it is easy.
> > First, we add "int interrupted" into struct qrcu_struct, then something like this
> 
> Even simpler, we don't need ->interrupted.
> 
> 	long synchronize_qrcu_timeout(struct qrcu_struct *qp, long tout)
> 	{
> 		int idx, prv;

Could we get less encrypted variable names? tout? Yes, I can decipher it.
									Pavel

-- 
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