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From: Nick Piggin <npiggin@suse.de>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	rob@landley.net, Jens Axboe <axboe@kernel.dk>
Subject: Re: [patch] rewrite rd
Date: Tue, 4 Dec 2007 11:10:09 +0100	[thread overview]
Message-ID: <20071204101009.GB9618@wotan.suse.de> (raw)
In-Reply-To: <200712041054.51599.borntraeger@de.ibm.com>

On Tue, Dec 04, 2007 at 10:54:51AM +0100, Christian Borntraeger wrote:
> Am Dienstag, 4. Dezember 2007 schrieb Nick Piggin:
> [...]
> > There is one slight downside -- direct block device access and filesystem
> > metadata access goes through an extra copy and gets stored in RAM twice.
> > However, this downside is only slight, because the real buffercache of the
> > device is now reclaimable (because we're not playing crazy games with it),
> > so under memory intensive situations, footprint should effectively be the
> > same -- maybe even a slight advantage to the new driver because it can also
> > reclaim buffer heads.
> 
> This is just an idea, I dont know if it is worth the trouble, but have you
> though about implementing direct_access for brd? That would allow 
> execute-in-place (xip) on brd eliminating the extra copy.

Actually that's a pretty good idea. It would allow xip to be tested
without special hardware as well...

I'll see what the patch looks like. Thanks


  reply	other threads:[~2007-12-04 10:10 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-04  4:26 Nick Piggin
2007-12-04  6:29 ` Andrew Morton
2007-12-04  7:01   ` Nick Piggin
2007-12-04  7:08     ` Nick Piggin
2007-12-04  7:55 ` Rob Landley
2007-12-04  9:29   ` Nick Piggin
2007-12-04 19:53     ` Rob Landley
2007-12-04  9:54 ` Christian Borntraeger
2007-12-04 10:10   ` Nick Piggin [this message]
2007-12-04 11:21     ` [patch] rd: support XIP Nick Piggin
2007-12-04 11:23       ` [patch] ext2: xip check fix Nick Piggin
2007-12-05 15:43         ` Carsten Otte
2007-12-05 23:33           ` Nick Piggin
2007-12-06  8:43             ` Carsten Otte
2007-12-06  8:52               ` Nick Piggin
2007-12-06  9:59                 ` Carsten Otte
2007-12-06 10:18                   ` Nick Piggin
2007-12-06 10:24                     ` Carsten Otte
2007-12-06 18:11                       ` Rob Landley
2007-12-07  3:22                         ` Jared Hulbert
2007-12-07  4:17                           ` Rob Landley
2007-12-07  4:23                             ` Nick Piggin
2007-12-07  4:40                             ` Jared Hulbert
2007-12-07  8:59                           ` Carsten Otte
2007-12-07  9:52                             ` Jared Hulbert
2007-12-04 11:26       ` [patch] rd: support XIP Andrew Morton
2007-12-04 11:35         ` Nick Piggin
2007-12-04 13:00           ` [patch] mm: fix XIP file writes Nick Piggin
2007-12-10 14:38             ` Christian Borntraeger
2007-12-12  4:03               ` Nick Piggin
2007-12-04 12:06       ` [patch] rd: support XIP Duane Griffin
2007-12-04 13:03         ` [patch] rd: support XIP (updated) Nick Piggin
2008-01-14 16:47 ` [patch] rewrite rd Matthew Wilcox
2008-01-14 17:21   ` Jens Axboe

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