linux-kernel - Re: [patch 20/23] dentries: Add constructor

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Message-ID: <Pine.LNX.4.64.0711081101000.8954@schroedinger.engr.sgi.com>
Date:	Thu, 8 Nov 2007 11:03:29 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@...net.ie>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 20/23] dentries: Add constructor

On Thu, 8 Nov 2007, Mel Gorman wrote:

> > Signed-off-by: Christoph Lameter <clameter@....com>
> 
> Seems to be some garbling on there in the signed-off lines.

Yes that needs to be fixed.

> > +void dcache_ctor(struct kmem_cache *s, void *p)
> > +{
> > +	struct dentry *dentry = p;
> > +
> > +	spin_lock_init(&dentry->d_lock);
> > +	dentry->d_inode = NULL;
> > +	INIT_LIST_HEAD(&dentry->d_lru);
> > +	INIT_LIST_HEAD(&dentry->d_alias);
> > +}
> > +
> 
> Is there any noticable overhead to the constructor?

Its a minor performance win since we can avoid reinitializing these
values and zeroing the object on alloc if there are already allocated 
objects.
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