Messages in this thread |  | | | From | Nick Piggin <> | | Subject | Re: [RFC] some page can't be migrated | | Date | Fri, 25 Jan 2008 16:20:38 +1100 |
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On Friday 25 January 2008 14:09, Shaohua Li wrote: > On Fri, 2008-01-25 at 14:03 +1100, Nick Piggin wrote: > > On Wednesday 23 January 2008 17:22, Shaohua Li wrote: > > > Anonymous page might have fs-private metadata, the page is truncated. > > > As the page hasn't mapping, page migration refuse to migrate the page. > > > It appears the page is only freed in page reclaim and if zone watermark > > > is low, the page is never freed, as a result migration always fail. I > > > thought we could free the metadata so such page can be freed in > > > migration and make migration more reliable? > > > > Anonymous pages should not have fs-private metadata. > > > > Orphaned pages I guess you mean? > > yes, maybe, but the comments in truncate_complete_page called the page > anonymous.
Ah, I see. I think we should use orphaned (or anything except anonymous) to describe these pages.
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