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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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