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    Subject[PATCH 0/3] [PATCH 0/3] swsusp: shrink file cache first
    [ grumble.  always check software for new behaviour after upgrade.
    sorry for the mess up :/ ]


    here are three patches that adjust the memory shrinking code used for

    The first two patches are cleanups only and can probably go in
    regardless of the third one.

    The third patch changes the shrink_all_memory() logic to drop the file
    cache first before touching any mapped files and only then goes for
    anon pages.

    The reason is that everything not shrunk before suspension has to go
    into the image and will be 'prefaulted' before the processes can
    resume and the system is usable again, so the image should be small
    and contain only pages that are likely to be used right after resume
    again. And this in turn means that the inactive file cache is the
    best point to start decimating used memory.

    Also, right now, subsequent faults of contiguously mapped files are
    likely to perform better than swapin (see, so not
    only file cache is preferred over other pages, but file pages over
    anon pages in general.

    Testing up to this point shows that the patch does what is intended,
    shrinking file cache in favor of anon pages. But whether the idea is
    correct to begin with is a bit hard to quantify and I am still working
    on it, so RFC only.


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      Last update: 2009-02-06 04:15    [W:0.042 / U:87.048 seconds]
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