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:
V3:
-add page lock when set HWPoison flag
-adjust the function structure
V2 and V1:
-fix the error
Xishi Qiu (2):
move poisoned page check at the beginning of the function
fix the function structure
mm/memory-failure.c | 69 ++++++++++++++++++++++++++++-----------------------
1 files changed, 38 insertions(+), 31 deletions(-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
