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>
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@ -40,6 +40,7 @@
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#define MADV_DONTFORK 10 /* don't inherit across fork */
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#define MADV_DOFORK 11 /* do inherit across fork */
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#define MADV_HWPOISON 100 /* poison a page for testing */
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#define MADV_SOFT_OFFLINE 101 /* soft offline page for testing */
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#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
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#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
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15
mm/madvise.c
15
mm/madvise.c
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@ -9,6 +9,7 @@
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#include <linux/pagemap.h>
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#include <linux/syscalls.h>
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#include <linux/mempolicy.h>
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#include <linux/page-isolation.h>
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#include <linux/hugetlb.h>
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#include <linux/sched.h>
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#include <linux/ksm.h>
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@ -222,7 +223,7 @@ static long madvise_remove(struct vm_area_struct *vma,
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/*
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* Error injection support for memory error handling.
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*/
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static int madvise_hwpoison(unsigned long start, unsigned long end)
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static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
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{
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int ret = 0;
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@ -233,6 +234,14 @@ static int madvise_hwpoison(unsigned long start, unsigned long end)
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int ret = get_user_pages_fast(start, 1, 0, &p);
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if (ret != 1)
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return ret;
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if (bhv == MADV_SOFT_OFFLINE) {
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printk(KERN_INFO "Soft offlining page %lx at %lx\n",
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page_to_pfn(p), start);
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ret = soft_offline_page(p, MF_COUNT_INCREASED);
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if (ret)
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break;
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continue;
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}
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printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
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page_to_pfn(p), start);
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/* Ignore return value for now */
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@ -333,8 +342,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
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size_t len;
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#ifdef CONFIG_MEMORY_FAILURE
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if (behavior == MADV_HWPOISON)
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return madvise_hwpoison(start, start+len_in);
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if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
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return madvise_hwpoison(behavior, start, start+len_in);
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#endif
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if (!madvise_behavior_valid(behavior))
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return error;
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