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authorWu Fengguang <fengguang.wu@intel.com>2009-12-16 14:19:59 +0300
committerAndi Kleen <ak@linux.intel.com>2009-12-16 14:19:59 +0300
commit478c5ffc0b50527bd2390f2daa46cc16276b8413 (patch)
treef58f5be9760fd0e81567611cf6e9f9bc77d1d3cd /Documentation/vm
parent1a9b5b7fe0c5dad8a635288882d36785dea742f9 (diff)
downloadlinux-478c5ffc0b50527bd2390f2daa46cc16276b8413.tar.xz
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 'Documentation/vm')
-rw-r--r--Documentation/vm/hwpoison.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/vm/hwpoison.txt b/Documentation/vm/hwpoison.txt
index 4ef7bb30d15c..f454d3cd4d60 100644
--- a/Documentation/vm/hwpoison.txt
+++ b/Documentation/vm/hwpoison.txt
@@ -123,6 +123,16 @@ Only handle memory failures to pages associated with the file system defined
by block device major/minor. -1U is the wildcard value.
This should be only used for testing with artificial injection.
+
+corrupt-filter-flags-mask
+corrupt-filter-flags-value
+
+When specified, only poison pages if ((page_flags & mask) == value).
+This allows stress testing of many kinds of pages. The page_flags
+are the same as in /proc/kpageflags. The flag bits are defined in
+include/linux/kernel-page-flags.h and documented in
+Documentation/vm/pagemap.txt
+
Architecture specific MCE injector
x86 has mce-inject, mce-test