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authorWu Fengguang <fengguang.wu@intel.com>2009-12-16 12:19:59 +0100
committerAndi Kleen <ak@linux.intel.com>2009-12-16 12:19:59 +0100
commit478c5ffc0b50527bd2390f2daa46cc16276b8413 (patch)
treef58f5be9760fd0e81567611cf6e9f9bc77d1d3cd /mm/hwpoison-inject.c
parent1a9b5b7fe0c5dad8a635288882d36785dea742f9 (diff)
downloadlinux-478c5ffc0b50527bd2390f2daa46cc16276b8413.tar.gz
HWPOISON: add page flags filter
When specified, only poison pages if ((page_flags & mask) == value). - corrupt-filter-flags-mask - corrupt-filter-flags-value This allows stress testing of many kinds of pages. Strictly speaking, the buddy pages requires taking zone lock, to avoid setting PG_hwpoison on a "was buddy but now allocated to someone" page. However we can just do nothing because we set PG_locked in the beginning, this prevents the page allocator from allocating it to someone. (It will BUG() on the unexpected PG_locked, which is fine for hwpoison testing.) [AK: Add select PROC_PAGE_MONITOR to satisfy dependency] CC: Nick Piggin <npiggin@suse.de> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm/hwpoison-inject.c')
-rw-r--r--mm/hwpoison-inject.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index 2b6b3200fa6..c4dfd89f654 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -102,6 +102,16 @@ static int pfn_inject_init(void)
if (!dentry)
goto fail;
+ dentry = debugfs_create_u64("corrupt-filter-flags-mask", 0600,
+ hwpoison_dir, &hwpoison_filter_flags_mask);
+ if (!dentry)
+ goto fail;
+
+ dentry = debugfs_create_u64("corrupt-filter-flags-value", 0600,
+ hwpoison_dir, &hwpoison_filter_flags_value);
+ if (!dentry)
+ goto fail;
+
return 0;
fail:
pfn_inject_exit();