diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-12-16 12:19:59 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-12-16 12:19:59 +0100 |
| commit | 478c5ffc0b50527bd2390f2daa46cc16276b8413 (patch) | |
| tree | f58f5be9760fd0e81567611cf6e9f9bc77d1d3cd /mm/memory-failure.c | |
| parent | 1a9b5b7fe0c5dad8a635288882d36785dea742f9 (diff) | |
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/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 82ac73436d0..22d2b2028e5 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -34,6 +34,7 @@ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/page-flags.h> +#include <linux/kernel-page-flags.h> #include <linux/sched.h> #include <linux/ksm.h> #include <linux/rmap.h> @@ -50,8 +51,12 @@ atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0); u32 hwpoison_filter_dev_major = ~0U; u32 hwpoison_filter_dev_minor = ~0U; +u64 hwpoison_filter_flags_mask; +u64 hwpoison_filter_flags_value; EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major); EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor); +EXPORT_SYMBOL_GPL(hwpoison_filter_flags_mask); +EXPORT_SYMBOL_GPL(hwpoison_filter_flags_value); static int hwpoison_filter_dev(struct page *p) { @@ -83,11 +88,26 @@ static int hwpoison_filter_dev(struct page *p) return 0; } +static int hwpoison_filter_flags(struct page *p) +{ + if (!hwpoison_filter_flags_mask) + return 0; + + if ((stable_page_flags(p) & hwpoison_filter_flags_mask) == + hwpoison_filter_flags_value) + return 0; + else + return -EINVAL; +} + int hwpoison_filter(struct page *p) { if (hwpoison_filter_dev(p)) return -EINVAL; + if (hwpoison_filter_flags(p)) + return -EINVAL; + return 0; } EXPORT_SYMBOL_GPL(hwpoison_filter); |