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SubjectRe: [patch 05/19] split LRU lists into anon & file sets
* KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2008-01-09 13:41:32]:

> I like this patch set thank you.
>
> On Tue, 08 Jan 2008 15:59:44 -0500
> Rik van Riel <riel@redhat.com> wrote:
> > Index: linux-2.6.24-rc6-mm1/mm/memcontrol.c
> > ===================================================================
> > --- linux-2.6.24-rc6-mm1.orig/mm/memcontrol.c 2008-01-07 11:55:09.000000000 -0500
> > +++ linux-2.6.24-rc6-mm1/mm/memcontrol.c 2008-01-07 17:32:53.000000000 -0500
> <snip>
>
> > -enum mem_cgroup_zstat_index {
> > - MEM_CGROUP_ZSTAT_ACTIVE,
> > - MEM_CGROUP_ZSTAT_INACTIVE,
> > -
> > - NR_MEM_CGROUP_ZSTAT,
> > -};
> > -
> > struct mem_cgroup_per_zone {
> > /*
> > * spin_lock to protect the per cgroup LRU
> > */
> > spinlock_t lru_lock;
> > - struct list_head active_list;
> > - struct list_head inactive_list;
> > - unsigned long count[NR_MEM_CGROUP_ZSTAT];
> > + struct list_head lists[NR_LRU_LISTS];
> > + unsigned long count[NR_LRU_LISTS];
> > };
> > /* Macro for accessing counter */
> > #define MEM_CGROUP_ZSTAT(mz, idx) ((mz)->count[(idx)])
> > @@ -160,6 +152,7 @@ struct page_cgroup {
> > };
> > #define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */
> > #define PAGE_CGROUP_FLAG_ACTIVE (0x2) /* page is active in this cgroup */
> > +#define PAGE_CGROUP_FLAG_FILE (0x4) /* page is file system backed */
> >
>
> Now, we don't have control_type and a feature for accounting only CACHE.
> Balbir-san, do you have some new plan ?
>

Hi, KAMEZAWA-San,

The control_type feature is gone. We still have cached page
accounting, but we do not allow control of only RSS pages anymore. We
need to control both RSS+cached pages. I do not understand your
question about new plan? Is it about adding back control_type?


> BTW, is it better to use PageSwapBacked(pc->page) rather than adding a new flag
> PAGE_CGROUP_FLAG_FILE ?
>
>
> PAGE_CGROUP_FLAG_ACTIVE is used because global reclaim can change
> ACTIVE/INACTIVE attribute without accessing memory cgroup.
> (Then, we cannot trust PageActive(pc->page))
>

Yes, correct. A page active on the node's zone LRU need not be active
in the memory cgroup.

> ANON <-> FILE attribute can be changed dinamically (after added to LRU) ?
>
> If no, using page_file_cache(pc->page) will be easy.
>
> Thanks,
> -Kame
>

--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL


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