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Commit afcf938e authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
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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: default avatarAndi Kleen <ak@linux.intel.com>
parent facb6011

include/asm-generic/mman-common.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

mm/madvise.c

+12 −3
Original line number Diff line number Diff line
@@ -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;