Messages in this thread | | | Date | Fri, 19 Jul 2013 10:39:56 -0400 | From | Naoya Horiguchi <> | Subject | Re: [PATCH 7/8] memory-hotplug: enable memory hotplug to handle hugepage |
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On Fri, Jul 19, 2013 at 01:40:38PM +0800, Hillf Danton wrote: > On Fri, Jul 19, 2013 at 5:34 AM, Naoya Horiguchi > <n-horiguchi@ah.jp.nec.com> wrote: > > @@ -518,9 +519,11 @@ static struct page *dequeue_huge_page_node(struct hstate *h, int nid) > > { > > struct page *page; > > > > - if (list_empty(&h->hugepage_freelists[nid])) > > + list_for_each_entry(page, &h->hugepage_freelists[nid], lru) > > + if (!is_migrate_isolate_page(page)) > > + break; > > + if (&h->hugepage_freelists[nid] == &page->lru) > > For what is this check?
This check returns true unless a non-isolated free hugepage is found. In "not found" case page points to h->hugepage_freelists, so without this check successive code doesn't work fine.
Thanks, Naoya
> > return NULL; > > - page = list_entry(h->hugepage_freelists[nid].next, struct page, lru); > > list_move(&page->lru, &h->hugepage_activelist); > > set_page_refcounted(page); > > h->free_huge_pages--; >
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