diff options
Diffstat (limited to 'Documentation/vm')
| -rw-r--r-- | Documentation/vm/hwpoison.txt | 52 | ||||
| -rw-r--r-- | Documentation/vm/page-types.c | 15 |
2 files changed, 62 insertions, 5 deletions
diff --git a/Documentation/vm/hwpoison.txt b/Documentation/vm/hwpoison.txt index 3ffadf8da61f..12f9ba20ccb7 100644 --- a/Documentation/vm/hwpoison.txt +++ b/Documentation/vm/hwpoison.txt @@ -92,16 +92,62 @@ PR_MCE_KILL_GET Testing: -madvise(MADV_POISON, ....) +madvise(MADV_HWPOISON, ....) (as root) Poison a page in the process for testing hwpoison-inject module through debugfs - /sys/debug/hwpoison/corrupt-pfn -Inject hwpoison fault at PFN echoed into this file +/sys/debug/hwpoison/ +corrupt-pfn + +Inject hwpoison fault at PFN echoed into this file. This does +some early filtering to avoid corrupted unintended pages in test suites. + +unpoison-pfn + +Software-unpoison page at PFN echoed into this file. This +way a page can be reused again. +This only works for Linux injected failures, not for real +memory failures. + +Note these injection interfaces are not stable and might change between +kernel versions + +corrupt-filter-dev-major +corrupt-filter-dev-minor + +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-memcg + +Limit injection to pages owned by memgroup. Specified by inode number +of the memcg. + +Example: + mkdir /cgroup/hwpoison + + usemem -m 100 -s 1000 & + echo `jobs -p` > /cgroup/hwpoison/tasks + + memcg_ino=$(ls -id /cgroup/hwpoison | cut -f1 -d' ') + echo $memcg_ino > /debug/hwpoison/corrupt-filter-memcg + + page-types -p `pidof init` --hwpoison # shall do nothing + page-types -p `pidof usemem` --hwpoison # poison its pages + +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 diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c index 7a7d9bab32ef..66e9358e2144 100644 --- a/Documentation/vm/page-types.c +++ b/Documentation/vm/page-types.c @@ -1,11 +1,22 @@ /* * page-types: Tool for querying page flags * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; version 2. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should find a copy of v2 of the GNU General Public License somewhere on + * your Linux system; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * * Copyright (C) 2009 Intel corporation * * Authors: Wu Fengguang <fengguang.wu@intel.com> - * - * Released under the General Public License (GPL). */ #define _LARGEFILE64_SOURCE |