diff options
| author | Andi Kleen <andi@firstfloor.org> | 2009-12-16 12:20:00 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-12-16 12:20:00 +0100 |
| commit | afcf938ee0aac4ef95b1a23bac704c6fbeb26de6 (patch) | |
| tree | fa4fe6ac0638f0abb8f7ae729b4151b8ecc52052 /mm/madvise.c | |
| parent | facb6011f3993947283fa15d039dacb4ad140230 (diff) | |
| download | lwn-afcf938ee0aac4ef95b1a23bac704c6fbeb26de6.tar.gz lwn-afcf938ee0aac4ef95b1a23bac704c6fbeb26de6.zip | |
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>
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 15 |
1 files changed, 12 insertions, 3 deletions
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; |