Re: [patch 08/11] mm: memcg: remove needless !mm fixup to init_mmwhen charging

[Michal Hocko]

On Tue 10-07-12 14:54:48, Wanpeng Li wrote:
> On Tue, Jul 10, 2012 at 08:21:04AM +0200, Michal Hocko wrote:
> >On Tue 10-07-12 14:10:21, Wanpeng Li wrote:
> >> On Mon, Jul 09, 2012 at 05:20:58PM +0200, Michal Hocko wrote:
> >> >On Thu 05-07-12 02:45:00, Johannes Weiner wrote:
> >> >> It does not matter to __mem_cgroup_try_charge() if the passed mm is
> >> >> NULL or init_mm, it will charge the root memcg in either case.
> >> 
> >> You can also change the comment in __mem_cgroup_try_charge :
> >> 
> >> "if so charge the init_mm" => "if so charge the root memcg"
> >
> >This is already in place:
> >"
> >If mm is NULL and the caller doesn't pass a valid memcg pointer, that is
> >treated as a charge to root_mem_cgroup.
> >"
> 
> IIUC, if still keep comment "if so charge the init_mm" is not correct,
> since pages in pagecache aren't mapped into any processes' ptes, 
> so mm is NULL, and these pages which in pagecache are not belong 
> to init_mm, the comment should be changed. :-)

Fair enough. I guess Johannes will change that in the next post.
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/