On Sunday, 8 April 2007 14:56, Pavel Machek wrote:
> Hi!
>
> > Some time ago we discussed the possibility of simplifying the swsusp's approach
> > towards tracking the swap pages allocated by it for saving the image (so that
> > they can be freed if there's an error).
> >
> > I think we can get back to it now, as it is a nice optimization that should
> > allow us to use less memory (almost always) and improve performance a bit.
> >
>
> Well, I do not think you can measure the difference, but...
As far as the memory usage is concerned, I can. :-) Usually, it takes 1 extent
(40 B on x86_64) to register all of the allocated swap pages. If bitmaps are
used, we need as many bits as there are swap pages available (for 1 GB swap
and 4 KB pages that would be ~250000 bits, which gives ~8 pages, and we can
save more than 800 extents using that much memory).
> > kernel/power/power.h | 27 +---------
> > kernel/power/swap.c | 18 +-----
> > kernel/power/swsusp.c | 135 ++++++++++++++++++++++++++------------------------
> > kernel/power/user.c | 22 +-------
> > 4 files changed, 85 insertions(+), 117 deletions(-)
>
> ....as it removes code... I think we can do that. But it is 2.6.23+
> material.
Yes, I think so, but still we can ask Andrew to include it into -mm earlier? ;-)
Rafael
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