linux-kernel - Re: [RFC] [PATCH] splice: add ->splice

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Date:	Tue, 19 Aug 2008 12:07:42 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] [PATCH] splice: add ->splice_read support for /dev/zero

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Mon, 18 Aug 2008 21:43:18 -0700

> > Preallocating the zero page is simpler and faster with the relatively
> > small (?) drawback of using an extra page of memory.
>
> How much faster is it?  What workloads/benchmarks/etc?
>

I should have said "theoretically faster" :)

I did not perform any tests, but, did I assumed correctly that it is going to 
be faster preallocating it then allocating it in every splice call?

> > Maybe when CONFIG_EMBEDED is selected we can switch to dynamically
> > allocating the page?
>
> One more page won't kill us.  People might want one-page-per-node, too.
> But that all depends on what the benefits and applications of this are..

Its the reverse of splice for /dev/null. Sometimes you don't care of the data 
pushed through the socket (e.g. protocol payload in networking testing). 

BTW, the patch its buggy, I'll send a new version for linux-next if you decide 
its worth it.

Thanks,
tavi

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