linux-kernel - Re: [patch 2/4] Timerfd v3

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Message-Id: <20071127133919.71e9bc00.akpm@linux-foundation.org>
Date:	Tue, 27 Nov 2007 13:39:19 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	linux-kernel@...r.kernel.org, mtk-manpages@....net,
	tglx@...utronix.de, torvalds@...ux-foundation.org
Subject: Re: [patch 2/4] Timerfd v3 - new timerfd API

On Tue, 27 Nov 2007 12:47:46 -0800 (PST)
Davide Libenzi <davidel@...ilserver.org> wrote:

> On Tue, 27 Nov 2007, Andrew Morton wrote:
> 
> > On Sun, 25 Nov 2007 14:14:19 -0800 Davide Libenzi <davidel@...ilserver.org> wrote:
> > 
> > > +static struct file *timerfd_fget(int fd)
> > > +{
> > > +	struct file *file;
> > > +
> > > +	file = fget(fd);
> > > +	if (!file)
> > > +		return ERR_PTR(-EBADF);
> > > +	if (file->f_op != &timerfd_fops) {
> > > +		fput(file);
> > > +		return ERR_PTR(-EINVAL);
> > > +	}
> > > +
> > > +	return file;
> > > +}
> > 
> > I suppose we could use fget_light() in here sometime.  It is significantly
> > quicker in microbenchmarks.  Or it was - nobody has checked that in a few
> > years afaik.
> 
> Should I now?

No great rush.  It'd be fun to see if it actually makes any measurable
difference on modern hardware (hint ;)).

> Half of the internet traffic of the last three month was 
> generated by me posting those timerfd patches :)

Which means my inbox gets 3000% of the internet.  Thought so.
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