Messages in this thread | | | Date | Thu, 18 Mar 2021 12:04:00 +0100 | From | Oscar Salvador <> | Subject | Re: [PATCH v5 1/5] mm,page_alloc: Bail out earlier on -ENOMEM in alloc_contig_migrate_range |
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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."
-- Oscar Salvador SUSE L3
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