On Thu, Jun 04, 2015 at 09:02:49PM +0800, Xishi Qiu wrote:
> Add a new interface in path /proc/sys/vm/mirrorable. When set to 1, it means
> we should allocate mirrored memory for both user and kernel processes.
As Dave and Kamezawa-san commented, documentation is not enough, so please
add a section in Documentation/sysctl/vm.txt for this new tuning parameter.
Thanks,
Naoya Horiguchi
>
> Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
> ---
> include/linux/mmzone.h | 1 +
> kernel/sysctl.c | 9 +++++++++
> mm/page_alloc.c | 1 +
> 3 files changed, 11 insertions(+)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index f82e3ae..20888dd 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -85,6 +85,7 @@ struct mirror_info {
> };
>
> extern struct mirror_info mirror_info;
> +extern int sysctl_mirrorable;
> # define is_migrate_mirror(migratetype) unlikely((migratetype) == MIGRATE_MIRROR)
> #else
> # define is_migrate_mirror(migratetype) false
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 2082b1a..dc2625e 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -1514,6 +1514,15 @@ static struct ctl_table vm_table[] = {
> .extra2 = &one,
> },
> #endif
> +#ifdef CONFIG_MEMORY_MIRROR
> + {
> + .procname = "mirrorable",
> + .data = &sysctl_mirrorable,
> + .maxlen = sizeof(sysctl_mirrorable),
> + .mode = 0644,
> + .proc_handler = proc_dointvec_minmax,
> + },
> +#endif
> {
> .procname = "user_reserve_kbytes",
> .data = &sysctl_user_reserve_kbytes,
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 249a8f6..63b90ca 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -212,6 +212,7 @@ int user_min_free_kbytes = -1;
>
> #ifdef CONFIG_MEMORY_MIRROR
> struct mirror_info mirror_info;
> +int sysctl_mirrorable = 0;
> #endif
>
> static unsigned long __meminitdata nr_kernel_pages;
> --
> 2.0.0
>
>
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