linux-kernel - Re: [PATCH][RFC] dynamic pipe resizing

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Message-ID: <Pine.LNX.4.64.0708241500370.28540@fbirervta.pbzchgretzou.qr>
Date:	Fri, 24 Aug 2007 15:02:19 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] dynamic pipe resizing


On Aug 24 2007 10:52, Jens Axboe wrote:
>Hi,
>
>Dabbling around with splice a bit, I added some code to change the size
>of a pipe. Currently it's hardcoded as 16 pages, with this patch you can
>shrink (if you wanted) or grow (the likely scenario) if you want to
>increase the size of your in-kernel buffer for splice operations.

Wonderful, I just did the same {-.-}
(but then dropped the patch because it did not help my application at all,
so never mind).

>Like with my original splice patches from 2005, I used fcntl()
>F_GETPIPE_SZ and F_SETPIPE_SZ to change the size of the pipe. I'm not
>particularly fond of that interface, so suggestions on how to improve it
>would be appreciated. Even if fcntl() should be the preferred approach,
>I think it would be better to pass in a byte based value instead of a
>number of pages.

And using  % pipe->buffers then?


	Jan
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