From: Andrea Arcangeli <andrea@suse.de>
To: Jens Axboe <axboe@suse.de>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Rik van Riel <riel@redhat.com>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, Robert_Hentosh@Dell.com,
Con Kolivas <kernel@kolivas.org>
Subject: Re: [PATCH][1/2] adjust dirty threshold for lowmem-only mappings
Date: Sun, 2 Jan 2005 17:18:20 +0100 [thread overview]
Message-ID: <20050102161820.GG5164@dualathlon.random> (raw)
In-Reply-To: <20050102151147.GA1930@suse.de>
On Sun, Jan 02, 2005 at 04:11:47PM +0100, Jens Axboe wrote:
> It should be lifted for block devices, it doesn't make any sense.
It cannot be lifted without:
1) creating aliasing between buffercache and blkdev pagecache
2) changing all fs to kmap around all buffercache accesses
2 would create an huge change (sure not a good idea during 2.6, 2.7 if
something). 1 would break lilo and tunefs and other things writing to a
superblock while the fs is mounted.
I effectively wrote it like 2 but I had to learn the hard way it broke
lilo in some weird configuration and IIRC Linus and Al fixed it very
nicely with current design.
There's no highmem and in turn no limit on 64bit in the first place, so
both efforts are worthless in the long term.
next prev parent reply other threads:[~2005-01-02 16:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-20 15:15 [PATCH][1/2] adjust dirty threshold for lowmem-only mappings Rik van Riel
2004-12-20 15:23 ` Rik van Riel
2004-12-20 20:54 ` Andrew Morton
2004-12-20 21:27 ` Rik van Riel
2004-12-23 19:21 ` Rik van Riel
2004-12-24 16:01 ` Andrea Arcangeli
2004-12-24 16:22 ` Rik van Riel
2004-12-24 16:40 ` Andrea Arcangeli
2004-12-24 22:12 ` Rik van Riel
2004-12-25 2:07 ` Andrea Arcangeli
2004-12-25 17:59 ` Rik van Riel
2004-12-25 18:36 ` Andrea Arcangeli
2004-12-25 19:07 ` William Lee Irwin III
2004-12-25 20:03 ` Andrea Arcangeli
2004-12-26 3:07 ` William Lee Irwin III
2005-01-02 16:10 ` Andrea Arcangeli
2005-01-02 16:36 ` William Lee Irwin III
2005-01-02 16:53 ` Rik van Riel
2005-01-02 17:21 ` Andrea Arcangeli
2004-12-25 22:03 ` Nikita Danilov
2004-12-26 3:16 ` William Lee Irwin III
2005-01-02 15:11 ` Jens Axboe
2005-01-02 16:18 ` Andrea Arcangeli [this message]
2005-01-02 20:03 ` Andrew Morton
2005-01-02 20:25 ` William Lee Irwin III
-- strict thread matches above, loose matches on Subject: below --
2004-12-20 16:46 Robert_Hentosh
2004-12-20 17:56 ` Sami Farin
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