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    SubjectRe: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.)
    Date
    Hi,

    On Tuesday 21 February 2006 12:33, Pavel Machek wrote:
    > On Po 20-02-06 20:32:25, Andy Lutomirski wrote:
    > > Matthias Hensler wrote:
    > > >On Mon, Feb 20, 2006 at 01:53:33AM +0100, Pavel Machek wrote:
    > > >
    > > >>Only feature I can't do is "save whole pagecache"... and 14000 lines
    > > >>of code for _that_ is a bit too much. I could probably patch my kernel
    > > >>to dump pagecache to userspace, but I do not think it is worth the
    > > >>effort.
    > > >
    > > >
    > > >I do not think that Suspend 2 needs 14000 lines for that, the core is
    > > >much smaller. But besides, _not_ saving the pagecache is a really _bad_
    > > >idea. I expect to have my system back after resume, in the same state I
    > > >had left it prior to suspend. I really do not like it how it is done by
    > > >Windows, it is just ugly to have a slowly responding system after
    > > >resume, because all caches and buffers are gone.
    > > >
    > > >I can only speak for myself, but I want to work with my system from the
    > > >moment my desktop is back.
    > >
    > > I Am Not A VM Hacker, but:
    > >
    > > What's the point of saving pagecache during suspend? This seems like a
    > > total waste. Why don't we save a list of pages in pagecache to disk,
    > > then, after resume, prefetch them all back in. This will slow down
    > > resume (extra seeks, minimized if we sort the list, and inability
    > > to compress these pages), but it will speed up suspend, and it sounds
    > > a lot simpler. There's already a patch to add swap prefetching, and
    > > this can't be much more complicated.
    >
    > I'd actually love to see this implemented. It would be useful for
    > suspend-to-disk (obviously), but also for benchmarks.

    Actually I've been thinking of something similar for some time,
    so perhaps we should add this to the todolist somewhere? ;-)

    Rafael
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