From: Nigel Cunningham <ncunningham@cyclades.com>
Organization: Cyclades Corporation
To: Dmitry Torokhov <dtor_core@ameritech.net>
Subject: Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.)
Date: Tue, 21 Feb 2006 15:51:08 +1000
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Cc: Andreas Happe <andreashappe@snikt.net>, linux-kernel@vger.kernel.org,
       Suspend2 Devel List <suspend2-devel@lists.suspend2.net>
References: <20060201113710.6320.68289.stgit@localhost.localdomain> <200602211257.29161.ncunningham@cyclades.com> <200602202319.15018.dtor_core@ameritech.net>
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Hi.

On Tuesday 21 February 2006 14:19, Dmitry Torokhov wrote:
> On Monday 20 February 2006 21:57, Nigel Cunningham wrote:
> > For the record, my thinking went: swsusp uses n (12?) bytes of meta data
> > for every page you save, where as using bitmaps makes that much closer =
to
> > a constant value (a small variable amount for recording where the image
> > will be stored in extents). 12 bytes per page is 3MB/1GB. If swsusp was
> > to add support for multiple swap partitions or writing to files, those
> > requirements might be closer to 5MB/GB.
>
> 5MB/GB amounts to 0.5% overhead, I don't think you should be concerned
> here. Much more important IMHO is that IIRC swsusp requires to be able to
> free 1/2 of the physical memory whuch is hard on low memory boxes.

Agreed. I'll look for related issues, and if there are none (or nothing=20
serious), we can have one less difference between the two implementations. =
I=20
may even be able to share the lowlevel code with Pavel then. That would be =
a=20
good step forward.

Regards,

Nigel

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