On Mon 29-01-18 16:29:42, Roger He wrote:
> ttm module needs it to determine its internal parameter setting.
Could you be more specific why?
> Signed-off-by: Roger He <Hongbo.He@xxxxxxx>
> ---
> include/linux/swap.h | 6 ++++++
> mm/swapfile.c | 15 +++++++++++++++
> 2 files changed, 21 insertions(+)
>
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index c2b8128..708d66f 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -484,6 +484,7 @@ extern int try_to_free_swap(struct page *);
> struct backing_dev_info;
> extern int init_swap_address_space(unsigned int type, unsigned long nr_pages);
> extern void exit_swap_address_space(unsigned int type);
> +extern long get_total_swap_pages(void);
>
> #else /* CONFIG_SWAP */
>
> @@ -516,6 +517,11 @@ static inline void show_swap_cache_info(void)
> {
> }
>
> +long get_total_swap_pages(void)
> +{
> + return 0;
> +}
> +
> #define free_swap_and_cache(e) ({(is_migration_entry(e) || is_device_private_entry(e));})
> #define swapcache_prepare(e) ({(is_migration_entry(e) || is_device_private_entry(e));})
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 3074b02..a0062eb 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -98,6 +98,21 @@ static atomic_t proc_poll_event = ATOMIC_INIT(0);
>
> atomic_t nr_rotate_swap = ATOMIC_INIT(0);
>
> +/*
> + * expose this value for others use
> + */
> +long get_total_swap_pages(void)
> +{
> + long ret;
> +
> + spin_lock(&swap_lock);
> + ret = total_swap_pages;
> + spin_unlock(&swap_lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(get_total_swap_pages);
> +
> static inline unsigned char swap_count(unsigned char ent)
> {
> return ent & ~SWAP_HAS_CACHE; /* may include SWAP_HAS_CONT flag */
> --
> 2.7.4
--
Michal Hocko
SUSE Labs
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