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Date:      Fri, 19 Feb 1999 14:12:21 +0000
From:      Peter Edwards <peter.edwards@isocor.ie>
To:        freebsd-hackers@freebsd.org
Subject:   Re: savecore before swapon?
Message-ID:  <36CD7145.EC9EA9D5@isocor.ie>
References:  <199902171836.TAA00897@yedi.iaf.nl> <199902180049.QAA13082@apollo.backplane.com>

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Hi,
How about _dumping_ to the end of the swap device, rather than hacking
on the swap code.

> :But this might be a lot of work, I'm not familiar with the VM.
Ditto.



Matthew Dillon wrote:
> 
> :Or start allocating swap 'backwards' from the high block# on the disk
> :downwards. Assuming swap > physical mem and dumps starting at swap offset 0
> :this should be safe at all times (unless fsck really allocates all swap
> :of course ;-)
> :

>     Hmm.  Well, I don't want to reverse-index the swap allocation but it
>     would be possible to set the hinting on the swap radix tree bitmap
>     to allocate higher swap blocks first.  I think it would be a little too
>     much of a hack to be worthy of the kernel, though.
> 
>                                         -Matt
>                                         Matthew Dillon
>                                         <dillon@backplane.com>
> 
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