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    SubjectRe: [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes
    Mel Gorman wrote:
    > Fragmentation avoidance depends on being able to use free pages from
    > lists of the appropriate migrate type. In the event this is not
    > possible, __rmqueue_fallback() selects a different list and in some
    > circumstances change the migratetype of the pageblock. Simplistically,
    > the more times this event occurs, the more likely that fragmentation
    > will be a problem later for hugepage allocation at least but there are
    > other considerations such as the order of page being split to satisfy
    > the allocation.

    Acked-by: Rik van Riel <>

    All rights reversed.

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