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HWPOISON, hugetlb: isolate corrupted hugepage

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If error hugepage is not in-use, we can fully recovery from error
by dequeuing it from freelist, so return RECOVERY.
Otherwise whether or not we can recovery depends on user processes,
so return DELAYED.

Dependency:
  "HWPOISON, hugetlb: enable error handling path for hugepage"

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Naoya Horiguchi
2010-05-28 09:29:20 +09:00
committed by Andi Kleen
parent c9fbdd5f13
commit 93f70f900d
3 changed files with 38 additions and 8 deletions
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28
mm/memory-failure.c
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@@ -690,17 +690,29 @@ static int me_swapcache_clean(struct page *p, unsigned long pfn)
/*
* Huge pages. Needs work.
* Issues:
* No rmap support so we cannot find the original mapper. In theory could walk
* all MMs and look for the mappings, but that would be non atomic and racy.
* Need rmap for hugepages for this. Alternatively we could employ a heuristic,
* like just walking the current process and hoping it has it mapped (that
* should be usually true for the common "shared database cache" case)
* Should handle free huge pages and dequeue them too, but this needs to
* handle huge page accounting correctly.
* - Error on hugepage is contained in hugepage unit (not in raw page unit.)
* To narrow down kill region to one page, we need to break up pmd.
* - To support soft-offlining for hugepage, we need to support hugepage
* migration.
*/
static int me_huge_page(struct page *p, unsigned long pfn)
{
return FAILED;
struct page *hpage = compound_head(p);
/*
* We can safely recover from error on free or reserved (i.e.
* not in-use) hugepage by dequeuing it from freelist.
* To check whether a hugepage is in-use or not, we can't use
* page->lru because it can be used in other hugepage operations,
* such as __unmap_hugepage_range() and gather_surplus_pages().
* So instead we use page_mapping() and PageAnon().
* We assume that this function is called with page lock held,
* so there is no race between isolation and mapping/unmapping.
*/
if (!(page_mapping(hpage) || PageAnon(hpage))) {
__isolate_hwpoisoned_huge_page(hpage);
return RECOVERED;
}
return DELAYED;
}
/*