From: Andrew Morton <akpm@osdl.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: ebiederm@xmission.com, suparna@in.ibm.com, fastboot@osdl.org,
mbligh@aracnet.com, jbarnes@engr.sgi.com,
linux-kernel@vger.kernel.org
Subject: Re: [Fastboot] Re: Announce: dumpfs v0.01 - common RAS output API
Date: Thu, 29 Jul 2004 11:17:28 -0700 [thread overview]
Message-ID: <20040729111728.5d2bb5c8.akpm@osdl.org> (raw)
In-Reply-To: <1091109427.865.1.camel@localhost.localdomain>
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>
> On Iau, 2004-07-29 at 01:22, Andrew Morton wrote:
> > eh? People do care. The point here is that we should stop the DMA in the
> > dump kernel, not from within the broken kernel.
>
> And pray just how do you expect to prove that the dump kernel isnt
> being overwritten *as* it is being loaded.
It was preloaded.
Of course, there's an assumption here that the dead kernel doesn't scribble
on pages which were never available to its page allocator. If DMA somehow
goes off and scribbles on the dump kernel we lose.
> > btw, if we simply insert a five-second-pause, what problems does that
> > leave? Network Rx, which is OK. Disk writes will have completed (?).
> > What remains?
>
> Network RX is the obvious one since we've no idea where the DMA is
> going in memory.
See above. We assume that network RX DMA won't be scribbling in the 16MB
which was pre-reserved. That's reasonable. We _have_ to assume that.
next prev parent reply other threads:[~2004-07-29 18:22 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-22 16:19 Announce: dumpfs v0.01 - common RAS output API Keith Owens
2004-07-26 6:57 ` Andrew Morton
2004-07-28 1:53 ` Eric W. Biederman
2004-07-28 10:54 ` Suparna Bhattacharya
2004-07-28 10:46 ` [Fastboot] " Alan Cox
2004-07-28 14:38 ` Martin J. Bligh
2004-07-28 14:06 ` Alan Cox
2004-07-28 15:21 ` Martin J. Bligh
2004-07-28 15:56 ` Eric W. Biederman
2004-07-28 17:09 ` Andrea Arcangeli
2004-07-28 16:05 ` Eric W. Biederman
2004-07-28 15:42 ` Eric W. Biederman
2004-07-28 15:12 ` Eric W. Biederman
2004-07-28 15:23 ` Martin J. Bligh
2004-07-28 15:53 ` Eric W. Biederman
2004-07-28 16:03 ` Jesse Barnes
2004-07-28 18:00 ` Eric W. Biederman
2004-07-28 18:06 ` Jesse Barnes
2004-07-28 19:42 ` Martin J. Bligh
2004-07-28 19:56 ` [Fastboot] " Alan Cox
2004-07-28 19:44 ` Andrew Morton
2004-07-28 23:11 ` [Fastboot] " Eric W. Biederman
2004-07-28 22:53 ` Alan Cox
2004-07-29 1:12 ` Eric W. Biederman
2004-07-29 14:00 ` Alan Cox
2004-07-29 15:47 ` Eric W. Biederman
2004-07-28 18:21 ` Alan Cox
2004-07-28 19:23 ` Martin J. Bligh
2004-07-28 20:28 ` [Fastboot] " Eric W. Biederman
2004-07-28 20:33 ` Andrew Morton
2004-07-28 19:59 ` Alan Cox
2004-07-28 22:42 ` Andrew Morton
2004-07-28 22:44 ` Jesse Barnes
2004-07-28 23:17 ` Eric W. Biederman
2004-07-28 22:55 ` Alan Cox
2004-07-29 0:22 ` Andrew Morton
2004-07-29 13:57 ` Alan Cox
2004-07-29 18:17 ` Andrew Morton [this message]
2004-07-29 21:20 ` Alan Cox
2004-07-29 22:30 ` Gerrit Huizenga
2004-07-30 0:04 ` Eric W. Biederman
2004-07-29 23:25 ` Alan Cox
2004-07-30 4:07 ` Eric W. Biederman
2004-07-30 12:38 ` Gerrit Huizenga
2004-07-31 13:52 ` Matthias Urlichs
2004-07-30 15:24 ` Olivier Galibert
2004-07-29 1:05 ` Eric W. Biederman
2004-07-29 14:12 ` Martin J. Bligh
2004-07-28 23:44 ` Andrew Morton
2004-07-29 0:58 ` Eric W. Biederman
2004-07-29 1:09 ` Andrew Morton
2004-07-29 1:56 ` Eric W. Biederman
2004-07-29 14:18 ` Martin J. Bligh
2004-07-29 16:01 ` Eric W. Biederman
2004-07-29 16:19 ` Eric W. Biederman
2004-07-29 14:08 ` Martin J. Bligh
2004-07-29 15:52 ` Eric W. Biederman
2004-07-29 16:13 ` Martin J. Bligh
2004-07-29 17:12 ` Matthias Urlichs
-- strict thread matches above, loose matches on Subject: below --
2004-07-30 15:02 Manfred Spraul
2004-07-30 14:42 ` Alan Cox
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