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authorAndi Kleen <andi@firstfloor.org>2009-12-16 14:20:00 +0300
committerAndi Kleen <ak@linux.intel.com>2009-12-16 14:20:00 +0300
commitafcf938ee0aac4ef95b1a23bac704c6fbeb26de6 (patch)
treefa4fe6ac0638f0abb8f7ae729b4151b8ecc52052
parentfacb6011f3993947283fa15d039dacb4ad140230 (diff)
downloadlinux-afcf938ee0aac4ef95b1a23bac704c6fbeb26de6.tar.xz
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>
-rw-r--r--include/asm-generic/mman-common.h1
-rw-r--r--mm/madvise.c15
2 files changed, 13 insertions, 3 deletions
diff --git a/include/asm-generic/mman-common.h b/include/asm-generic/mman-common.h
index 20111265afd8..3da9e2742fa0 100644
--- a/include/asm-generic/mman-common.h
+++ b/include/asm-generic/mman-common.h
@@ -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 */
diff --git a/mm/madvise.c b/mm/madvise.c
index 7964e36ba915..319528b8db74 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -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;