> How about this?
>
> (Not formal patch. If we agree, I will post it later when I have a SMTP).
>
>
> Signed-off-by: Ying Han <yinghan@xxxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 3109ff7..c3c44a8 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1579,7 +1579,7 @@ static void shrink_active_list(unsigned long
> nr_pages, struct zone *zone,
> __mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
> spin_unlock_irq(&zone->lru_lock);
> }
> -
> +#if CONFIG_SWAP
> static int inactive_anon_is_low_global(struct zone *zone)
> {
> unsigned long active, inactive;
> @@ -1605,12 +1605,21 @@ static int inactive_anon_is_low(struct zone
> *zone, struct scan_control *sc)
> {
> int low;
>
> + if (nr_swap_pages)
> + return 0;
!nr_swap_pages ?
> +
> if (scanning_global_lru(sc))
> low = inactive_anon_is_low_global(zone);
> else
> low = mem_cgroup_inactive_anon_is_low(sc->mem_cgroup);
> return low;
> }
> +#else
> +static inline int inactive_anon_is_low(struct zone *zone, struct
> scan_control *sc)
> +{
> + return 0;
> +}
> +#endif
Yup. I prefer this explicit #ifdef :)
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