On 04/20/2016 09:47 PM, Michal Hocko wrote:
From: Michal Hocko <[email protected]>Compaction can provide a wild variation of feedback to the caller. Many of them are implementation specific and the caller of the compaction (especially the page allocator) shouldn't be bound to specifics of the current implementation. This patch abstracts the feedback into three basic types: - compaction_made_progress - compaction was active and made some progress. - compaction_failed - compaction failed and further attempts to invoke it would most probably fail and therefore it is not worth retrying - compaction_withdrawn - compaction wasn't invoked for an implementation specific reasons. In the current implementation it means that the compaction was deferred, contended or the page scanners met too early without any progress. Retrying is still worthwhile. [[email protected]: do not change thp back off behavior] Signed-off-by: Michal Hocko <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
