linux-kernel - Re: [take12 3/3] kevent: Timer notifications.

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Message-ID: <20060822054855.GA20517@2ka.mipt.ru>
Date:	Tue, 22 Aug 2006 09:48:55 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>, tglx@...utronix.de
Subject: Re: [take12 3/3] kevent: Timer notifications.

On Mon, Aug 21, 2006 at 09:36:50PM -0700, Andrew Morton (akpm@...l.org) wrote:
> On Mon, 21 Aug 2006 16:09:34 +0400
> Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > On Mon, Aug 21, 2006 at 12:12:39PM +0100, Christoph Hellwig (hch@...radead.org) wrote:
> > > > +static int __init kevent_init_timer(void)
> > > > +{
> > > > +	struct kevent_callbacks tc = {
> > > > +		.callback = &kevent_timer_callback, 
> > > > +		.enqueue = &kevent_timer_enqueue, 
> > > > +		.dequeue = &kevent_timer_dequeue};
> > > 
> > > I think this should be static, and the normal style to write it would be:
> > > 
> > > static struct kevent_callbacks tc = {
> > > 	.callback	= kevent_timer_callback,
> > > 	.enqueue	= kevent_timer_enqueue,
> > > 	.dequeue	= kevent_timer_dequeue,
> > > };
> > > 
> > > also please consider makring all the kevent_callbacks structs const
> > > to avoid false cacheline sharing and accidental modification, similar
> > > to what we did to various other operation vectors.
> > 
> > Actually I do not think it should be static, since it is only used for
> > initialization and it's members are copied into main structure.
> > 
> 
> It should be static __initdata a) so we don't need to construct it at
> runtime and b) so it gets dropped from memory after initcalls have run.
> 
> (But given that kevent_init_timer() also gets dropped from memory after initcalls
> it hardly matters).

That's what I'm talking about.

-- 
	Evgeniy Polyakov
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