On Mon, Sep 11, 2023 at 03:41:45PM -0400, Johannes Weiner wrote: > When a block is partially outside the zone of the cursor page, the > function cuts the range to the pivot page instead of the zone > start. This can leave large parts of the block behind, which > encourages incompatible page mixing down the line (ask for one type, > get another), and thus long-term fragmentation. > > This triggers reliably on the first block in the DMA zone, whose > start_pfn is 1. The block is stolen, but everything before the pivot > page (which was often hundreds of pages) is left on the old list. > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Oops Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> -- Mel Gorman SUSE Labs
