On Wed, Jul 24, 2019 at 10:50:13AM -0700, Mike Kravetz wrote: > For PAGE_ALLOC_COSTLY_ORDER allocations, MIN_COMPACT_COSTLY_PRIORITY is > minimum (highest priority). Other places in the compaction code key off > of MIN_COMPACT_PRIORITY. Costly order allocations will never get to > MIN_COMPACT_PRIORITY. Therefore, some conditions will never be met for > costly order allocations. > > This was observed when hugetlb allocations could stall for minutes or > hours when should_compact_retry() would return true more often then it > should. Specifically, this was in the case where compact_result was > COMPACT_DEFERRED and COMPACT_PARTIAL_SKIPPED and no progress was being > made. > > Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> -- Mel Gorman SUSE Labs
