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Message-Id: <20240918045836.10825-1-gxxa03070307@gmail.com> Date: Wed, 18 Sep 2024 12:58:36 +0800 From: Xiang Gao <gxxa03070307@...il.com> To: akpm@...ux-foundation.org Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, gaoxiang17 <gaoxiang17@...omi.com> Subject: [PATCH] mm/page_alloc: Add some comments for specific scenarios to make it easier to understand why unmovable and reclaimable allocations can steal from moveable pageblocks by default. From: gaoxiang17 <gaoxiang17@...omi.com> Signed-off-by: gaoxiang17 <gaoxiang17@...omi.com> --- 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
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