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

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Message-ID: <40f323d00612100310v176ff03es73ceeb520d631e4b@mail.gmail.com>
Date:	Sun, 10 Dec 2006 12:10:54 +0100
From:	"Benoit Boissinot" <bboissin@...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 12/10/06, 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.
>
> The psuedocode would be:
>
> fd_inp = open _output_file
> fd_out = open _input_file
> instruct_kernel to write next data read from fd_inp to fd_out
> read fd_out
>
>
I think you are describing the splice syscall:

see http://lwn.net/Articles/178199/

regards,

Benoit
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