linux-kernel - Re: [PATCH] [DISCUSS] Optimizing linux applications with the help of the kernel.

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Message-ID: <9a8748490612100314i636a16e1le173f26e1c5bc922@mail.gmail.com>
Date:	Sun, 10 Dec 2006 12:14:46 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Amit Choudhary" <amit2030@...oo.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [DISCUSS] Optimizing linux applications with the help of the kernel.

On 10/12/06, Amit Choudhary <amit2030@...oo.com> wrote:
> Hi All,
>
> I just had an idea for improving the performance of linux applications with some help from the
> kernel. Let's say that I have to make a copy of a file. So, I read the input file into a buffer
> and then write the buffer to the output file.
>
> In both these cases the same data is coming from kernel_to_user and then from user_to_kernel. If
> this can be short-circuited, that is, from kernel_to_kernel then the performance can be increased
> a lot.
>

See the linux specific splice() syscall - "man 2 splice".

-- 
Jesper Juhl <jesper.juhl@...il.com>
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