[Devel] Re: [PATCH 4/4] swapcgroup: modify vm_swap_full for cgroup

[Daisuke Nishimura]

Hi,

On 2008/05/22 17:00 +0900, KOSAKI Motohiro wrote:
> 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
> 
OK.
I'll change it.

> and vm_swap_full() isn't page granularity operation.
> this is memory(or swap) cgroup operation.
> 
> this argument is slightly odd.
> 
But what callers of vm_swap_full() know is page,
not mem_cgroup.
I don't want to add to callers something like:

  pc = get_page_cgroup(page);
  mem = pc->mem_cgroup;
  vm_swap_full(mem);


Thanks,
Daisuke Nishimura.

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