From: volodya@mindspring.com
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mm question
Date: Mon, 10 Dec 2001 10:03:47 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.20.0112101001220.17259-100000@node2.localnet.net> (raw)
In-Reply-To: <E16DR5n-00028k-00@the-village.bc.nu>
On Mon, 10 Dec 2001, Alan Cox wrote:
> > It does not have to be contiguous. I was thinking of simply starting with
> > the smallest address and trying to free the pages until the needed amount
> > is available. But I have no idea how to properly do locking or force the
> > page to be swapped out or something.
>
> You can simply get_free_page() 300K of pages. However you can't land them
> in a given band other than the existing "below 16Mb" "below 4Gb" "anywhere"
> bands.
Right, but then my card refuses to dma into anything with address smaller
than 04000000.
I have thought of doing get_free_page until I have enough of pages with
large addresses (and then free all the small ones as 64mb is a finite
amount) but this would place a big load on the system during buffer
allocation.
I was hoping for something more elegant, but I am not adverse to writing
my own get_free_page_from_range().
Vladimir Dergachev
>
> Alan
> -
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> Please read the FAQ at http://www.tux.org/lkml/
>
next prev parent reply other threads:[~2001-12-10 15:05 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-10 13:25 volodya
2001-12-10 13:46 ` Alan Cox
2001-12-10 13:47 ` volodya
2001-12-10 14:07 ` Alan Cox
2001-12-10 15:03 ` volodya [this message]
2001-12-10 15:21 ` Alan Cox
2001-12-10 15:40 ` Rik van Riel
2001-12-10 16:14 ` volodya
2001-12-10 16:48 ` Rik van Riel
2001-12-10 17:02 ` volodya
2001-12-10 17:16 ` Alan Cox
2001-12-10 17:29 ` volodya
2001-12-10 18:05 ` Rik van Riel
2001-12-10 18:08 ` volodya
2001-12-10 18:17 ` Rik van Riel
2001-12-10 21:30 ` volodya
2001-12-10 18:26 ` Alan Cox
2001-12-10 21:27 ` volodya
2001-12-10 21:42 ` Alan Cox
2001-12-11 1:52 ` volodya
2001-12-11 8:47 ` Eric W. Biederman
2001-12-11 11:07 ` volodya
2001-12-11 18:39 ` Daniel Phillips
2001-12-10 16:05 ` volodya
2001-12-10 17:09 ` Martin J. Bligh
2001-12-10 17:16 ` Martin J. Bligh
2001-12-10 17:26 ` volodya
2001-12-10 17:25 ` Alan Cox
2001-12-10 17:38 ` volodya
2001-12-10 17:51 ` Alan Cox
2001-12-10 17:43 ` volodya
2001-12-10 18:12 ` Alan Cox
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