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SubjectRe: [PATCH 0/12] memcg updates v5
On Fri, 26 Sep 2008 19:36:02 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> > I think (1) might be OK, except for the accounting issues pointed out (change in
> > behaviour visible to end user again, sigh! :( ).
> But it was just a BUG from my point of view...
>
> > Is (1) a serious issue?
> considering force_empty(), it's serious.
>
> > (2) seems OK, except for the locking change for mark_page_accessed. I am looking at
> > (4) and (6) currently.
> >

I'll do in following way in the next Monday.
Divide patches into 2 set

in early fix/optimize set.
- push (2)
- push (4)
- push (6)
- push (1)

drops (3).

I don't want to remove all? pages-never-on-LRU before fixing force_empty.

in updates
- introduce atomic flags. (5)
- add move_account() function (7)
- add memory.attribute to each memcg dir. (NEW)
- enhance force_empty (was (8))
- remove "forget all" logic. and add attribute to select following 2 behavior
- call try_to_free_page() until the usage goes down to 0.
This allows faiulre (if page is mlocked, we can't do.). (NEW)
- call move_account() to move all charges to its parent (as much as possible) (NEW)
In future, I'd liket to add trash-box cgroup for force_empty somewhere.
- allocate all page cgroup at boot (9)
- lazy lru free/add (10,11) with fixes.
- fix race at charging swap. (12)

After (9), all page and page_cgroup has one-to-one releationship and we want to
assume that "if page is alive and on LRU, it's accounted and has page_cgroup."
(other team, bio cgroup want to use page_cgroup and I want to make it easy.)

For this, fix to behavior of force_empty..."forget all" is necessary.
SwapCache handling is also necessary but I'd like to postpone until next set
because it's complicated.

After above all.
- handle swap cache
- Mem+Swap controller.
- add trashbox feature ?
- add memory.shrink_usage_to file.

It's long way to what I really want to do....


Thanks,
-Kame








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