From: gaoxiang17 <gaoxiang17@xxxxxxxxxx> Signed-off-by: gaoxiang17 <gaoxiang17@xxxxxxxxxx> --- mm/page_alloc.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 91ace8ca97e2..cc8a7a0772cb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1818,6 +1818,13 @@ static bool can_steal_fallback(unsigned int order, int start_mt) if (order >= pageblock_order) return true; + /* + * The reasons why unmovable and reclaimable allocations can steal from + * moveable pageblocks by default aside from the above comments, a different + * and better understood scenario is: System initializations are all movable + * pageblocks. If you want to alloc unmovable and reclaimable pages, + * you have to steal from moveable pageblocks or it may fail. + */ if (order >= pageblock_order / 2 || start_mt == MIGRATE_RECLAIMABLE || start_mt == MIGRATE_UNMOVABLE || -- 2.34.1
