Hi,

> +#ifndef CONFIG_CGROUP_SWAP_RES_CTLR
>  /* Swap 50% full? Release swapcache more aggressively.. */
> -#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)
> +#define vm_swap_full(page) (nr_swap_pages*2 < total_swap_pages)
> +#else
> +#define vm_swap_full(page) swap_cgroup_vm_swap_full(page)
> +#endif

I'd prefer #ifdef rather than #ifndef.

so...

#ifdef CONFIG_CGROUP_SWAP_RES_CTLR
  your definition
#else
  original definition
#endif

and vm_swap_full() isn't page granularity operation.
this is memory(or swap) cgroup operation.

this argument is slightly odd.




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