Re: [PATCH] mm: add show num_poisoned_pages when oom

Michal Hocko
2013-12-09T15:50:04Z

On Mon 09-12-13 17:52:30, Xishi Qiu wrote:
> Show num_poisoned_pages when oom, it is helpful to find the reason.
>
> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>

I would not expect the number of these pages would be too high to matter in
real life but having the information cannot be harmful in any way.

Acked-by: Michal Hocko <mhocko@suse.cz>

> ---
> lib/show_mem.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/lib/show_mem.c b/lib/show_mem.c
> index 5847a49..1cbdcd8 100644
> --- a/lib/show_mem.c
> +++ b/lib/show_mem.c
> @@ -46,4 +46,7 @@ void show_mem(unsigned int filter)
> printk("%lu pages in pagetable cache\n",
> quicklist_total_size());
> #endif
> +#ifdef CONFIG_MEMORY_FAILURE
> + printk("%lu pages poisoned\n", atomic_long_read(&num_poisoned_pages));
> +#endif
> }
> --
> 1.7.1
>

--
Michal Hocko
SUSE Labs