diff options
Diffstat (limited to 'Documentation/vm/hwpoison.txt')
| -rw-r--r-- | Documentation/vm/hwpoison.txt | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/Documentation/vm/hwpoison.txt b/Documentation/vm/hwpoison.txt index 3ffadf8da61..12f9ba20ccb 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 |