Messages in this thread | | | Date | Tue, 9 Dec 2014 09:59:22 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH] mm: page_alloc: place zone id check before VM_BUG_ON_PAGE check |
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On Tue, Dec 09, 2014 at 03:40:35PM +0800, Weijie Yang wrote: > If the free page and its buddy has different zone id, the current > zone->lock cann't prevent buddy page getting allocated, this could > trigger VM_BUG_ON_PAGE in a very tiny chance: >
Under what circumstances can a buddy page be allocated without the zone->lock? Any parallel allocation from that zone that takes place will be from the per-cpu allocator and should not be affected by this. Have you actually hit this race?
-- Mel Gorman SUSE Labs
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