linux-kernel - Re: [PATCH] tcp: splice as many packets as possible at once

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Message-ID: <20090115231934.GA8328@gondor.apana.org.au>
Date:	Fri, 16 Jan 2009 10:19:35 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Willy Tarreau <w@....eu>
Cc:	David Miller <davem@...emloft.net>, jarkao2@...il.com,
	zbr@...emap.net, dada1@...mosbay.com, ben@...s.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

On Fri, Jan 16, 2009 at 12:03:31AM +0100, Willy Tarreau wrote:
> 
> I'm leaving the patch below for comments, maybe someone will spot
> something ? Don't we need at least one kfree() somewhere to match
> alloc_pages() ?

Indeed.

> >  static inline int spd_fill_page(struct splice_pipe_desc *spd, struct page *page,
> >  				unsigned int len, unsigned int offset,
> > -				struct sk_buff *skb)
> > +				struct sk_buff *skb, int linear)
> >  {
> >  	if (unlikely(spd->nr_pages == PIPE_BUFFERS))
> >  		return 1;
> >  
> > +	if (linear) {
> > +		page = linear_to_page(page, len, offset);
> > +		if (!page)
> > +			return 1;
> > +	}
> > +
> >  	spd->pages[spd->nr_pages] = page;
> >  	spd->partial[spd->nr_pages].len = len;
> >  	spd->partial[spd->nr_pages].offset = offset;
> > -	spd->partial[spd->nr_pages].private = (unsigned long) skb_get(skb);
> >  	spd->nr_pages++;
> > +	get_page(page);

This get_page needs to be moved into an else clause of the previous
if block.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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