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    SubjectRe: [PATCH 1/3] page-allocator: Split per-cpu list into one-list-per-migrate-type
    On Tue, 18 Aug 2009, Mel Gorman wrote:

    > + /*
    > + * We only track unreclaimable, reclaimable and movable on pcp lists.
    ^^^^^^^^^^^^^
    Is it unmovable? I don't see unreclaimable migrate type on pcp lists.
    Just ask to make sure I undsterstand the comment right.

    > + * Free ISOLATE pages back to the allocator because they are being
    > + * offlined but treat RESERVE as movable pages so we can get those
    > + * areas back if necessary. Otherwise, we may have to free
    > + * excessively into the page allocator
    > + */
    > + if (migratetype >= MIGRATE_PCPTYPES) {
    > + if (unlikely(migratetype == MIGRATE_ISOLATE)) {
    > + free_one_page(zone, page, 0, migratetype);
    > + goto out;
    > + }
    > + migratetype = MIGRATE_MOVABLE;
    > + }
    > +

    Vincent Li
    Biomedical Research Center
    University of British Columbia


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