When we use "/sys/devices/system/memory/soft_offline_page" to offline a
*free* page, the value of mce_bad_pages will be added, and the page is set
HWPoison flag, but it is still managed by page buddy alocator.
$ cat /proc/meminfo | grep HardwareCorrupted shows the value.
If we offline the same page, the value of mce_bad_pages will be added
*again*, this means the value is incorrect now. Assume the page is
still free during this short time.
soft_offline_page()
get_any_page()
"else if (is_free_buddy_page(p))" branch return 0
"goto done";
"atomic_long_add(1, &mce_bad_pages);"
Changelog:
V4:
-use num_poisoned_pages instead of mce_bad_pages
-remove page lock
V3:
-add page lock when set HWPoison flag
-adjust the function structure
V2 and V1:
-fix the error
Xishi Qiu (3):
move-poisoned-page-check-at-the-beginning-of-the-function
fix-function-structure
use-num_poisoned_pages-instead-of-mce_bad_pages
fs/proc/meminfo.c | 2 +-
include/linux/mm.h | 2 +-
mm/memory-failure.c | 76 ++++++++++++++++++++++++++-------------------------
3 files changed, 41 insertions(+), 39 deletions(-)
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