On 04/05/2016 01:25 PM, Michal Hocko wrote:
From: Michal Hocko <mhocko@xxxxxxxx> compaction_result will be used as the primary feedback channel for compaction users. At the same time try_to_compact_pages (and potentially others) assume a certain ordering where a more specific feedback takes precendence. This gets a bit awkward when we have conflicting feedback from different zones. E.g one returing COMPACT_COMPLETE meaning the full zone has been scanned without any outcome while other returns with COMPACT_PARTIAL aka made some progress. The caller should get COMPACT_PARTIAL because that means that the compaction still can make some progress. The same applies for COMPACT_PARTIAL vs. COMPACT_PARTIAL_SKIPPED. Reorder PARTIAL to be the largest one so the larger the value is the more progress we have done. Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
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