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HWPOISON: Add a madvise() injector for soft page offlining 

Process based injection is much easier to handle for test programs,
who can first bring a page into a specific state and then test.
So add a new MADV_SOFT_OFFLINE to soft offline a page, similar
to the existing hard offline injector.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Andi Kleen 2009-12-16 12:20:00 +01:00 committed by Andi Kleen
parent facb6011f3
commit afcf938ee0
2 changed files with 13 additions and 3 deletions
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1
include/asm-generic/mman-common.h
View File

@ -40,6 +40,7 @@
#define MADV_DONTFORK 10 /* don't inherit across fork */
#define MADV_DOFORK 11 /* do inherit across fork */
#define MADV_HWPOISON 100 /* poison a page for testing */
#define MADV_SOFT_OFFLINE 101 /* soft offline page for testing */
#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */

15
mm/madvise.c
View File

@ -9,6 +9,7 @@
#include <linux/pagemap.h>
#include <linux/syscalls.h>
#include <linux/mempolicy.h>
#include <linux/page-isolation.h>
#include <linux/hugetlb.h>
#include <linux/sched.h>
#include <linux/ksm.h>
@ -222,7 +223,7 @@ static long madvise_remove(struct vm_area_struct *vma,
/*
* Error injection support for memory error handling.
*/
static int madvise_hwpoison(unsigned long start, unsigned long end)
static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
{
int ret = 0;
@ -233,6 +234,14 @@ static int madvise_hwpoison(unsigned long start, unsigned long end)
int ret = get_user_pages_fast(start, 1, 0, &p);
if (ret != 1)
return ret;
if (bhv == MADV_SOFT_OFFLINE) {
printk(KERN_INFO "Soft offlining page %lx at %lx\n",
page_to_pfn(p), start);
ret = soft_offline_page(p, MF_COUNT_INCREASED);
if (ret)
break;
continue;
}
printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
page_to_pfn(p), start);
/* Ignore return value for now */
@ -333,8 +342,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
size_t len;
#ifdef CONFIG_MEMORY_FAILURE
if (behavior == MADV_HWPOISON)
return madvise_hwpoison(start, start+len_in);
if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
return madvise_hwpoison(behavior, start, start+len_in);
#endif
if (!madvise_behavior_valid(behavior))
return error;