Messages in this thread | | | Date | Thu, 18 Mar 2021 12:37:44 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH v5 1/5] mm,page_alloc: Bail out earlier on -ENOMEM in alloc_contig_migrate_range |
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On Thu 18-03-21 12:04:00, Oscar Salvador wrote: > On Wed, Mar 17, 2021 at 03:05:40PM +0100, Michal Hocko wrote: > > That being said, bailing out early makes sense to me. But now that > > you've made me look into the migrate_pages excellent error state reporting > > I suspect we have a bug here. Note the > > "Returns the number of pages that were not migrated, or an error code." > > > > but I do not see putback_movable_pages for ret > 0 so it seems we might > > leak some pages. > > I fell for the same thing when looking at that code. > It took a while until I realized what was really going on. > > > > Signed-off-by: Oscar Salvador <osalvador@suse.de> > > > Acked-by: Vlastimil Babka <vbabka@suse.cz> > > > Reviewed-by: David Hildenbrand <david@redhat.com> > > > > The patch itself looks reasonable but make sure to mention this is mere > > cosmetic change unless there is a real problem fixed by this. > > Acked-by: Michal Hocko <mhocko@suse.com> > > What about appending the following in the changelog: > > "Note that this is not fixing a real issue, just a cosmetic change. Although > we can save some cycles by backing off ealier."
Sounds good to me.
-- Michal Hocko SUSE Labs
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