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    Subject[PATCH] [0/31] HWPOISON 2.6.33 pre-merge posting

    These are the hwpoison updates for 2.6.33
    I plan to send the following patchkit to Linus in a few days.
    Any additional review would be appreciated.

    Major new features:
    - Be more aggressive at flushing caches to get access to a page
    - Various fixes for the core memory_failure path
    - Handle free memory better by detecting higher-order buddy pages
    reliably too.
    - Reliable return value for memory_failure. This allows to implement
    some other functionality later on.
    - New soft offlining feature:
    Offline a page without killing a process.
    This allows to implement predictive failure analysis for memory, by
    watching error trends per page and offlining a page that has too many
    corrected errors. The policy is all in user space; the kernel just
    offlines the page and reports the errors.
    The current git mcelog has support for using this interface.
    - Provide a new sysfs interface for both hard and soft offlining.
    The existing debugfs interface is still there.
    - unpoison support
    Unpoison a page. This is mainly for testing, it does not do unpoisioning
    on the hardware level.
    - hwpoison filter
    Various filters to the hwpoison PFN error injection, including
    memcg, page type, block device and others.
    This is used by the mce-test stress suite to protect the test suite itself

    This touches some code outside hwpoison, mostly for the memcg support
    and for the page types. All these changes are straight-forward,
    are in linux-next and have been posted before.


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