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HWPOISON, hugetlb: support hwpoison injection for hugepage

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This patch enables hwpoison injection through debug/hwpoison interfaces,
with which we can test memory error handling for free or reserved
hugepages (which cannot be tested by madvise() injector).

[AK: Export PageHuge too for the injection module]
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 09:29:22 +09:00 committed by Andi Kleen
parent fd6a03edd2
commit 43131e141a
2 changed files with 11 additions and 6 deletions
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2
mm/hugetlb.c
View file

@ -615,6 +615,8 @@ int PageHuge(struct page *page)
return dtor == free_huge_page;
}
EXPORT_SYMBOL_GPL(PageHuge);
static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
{
struct page *page;

15
mm/hwpoison-inject.c
View file

@ -5,6 +5,7 @@
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/hugetlb.h>
#include "internal.h"
static struct dentry *hwpoison_dir;
@ -13,6 +14,7 @@ static int hwpoison_inject(void *data, u64 val)
{
unsigned long pfn = val;
struct page *p;
struct page *hpage;
int err;
if (!capable(CAP_SYS_ADMIN))
@ -24,18 +26,19 @@ static int hwpoison_inject(void *data, u64 val)
return -ENXIO;
p = pfn_to_page(pfn);
hpage = compound_head(p);
/*
* This implies unable to support free buddy pages.
*/
if (!get_page_unless_zero(p))
if (!get_page_unless_zero(hpage))
return 0;
if (!PageLRU(p))
if (!PageLRU(p) && !PageHuge(p))
shake_page(p, 0);
/*
* This implies unable to support non-LRU pages.
*/
if (!PageLRU(p))
if (!PageLRU(p) && !PageHuge(p))
return 0;
/*
@ -44,9 +47,9 @@ static int hwpoison_inject(void *data, u64 val)
* We temporarily take page lock for try_get_mem_cgroup_from_page().
* __memory_failure() will redo the check reliably inside page lock.
*/
lock_page(p);
err = hwpoison_filter(p);
unlock_page(p);
lock_page(hpage);
err = hwpoison_filter(hpage);
unlock_page(hpage);
if (err)
return 0;