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SubjectRe: [PATCH -mm][preview] memcg: a patch series for next [0/9]
KAMEZAWA Hiroyuki wrote:
> Hi,
>
> This post is for showing what I'm trying now.
>
> This patch set is for memory resource controller.
> 4 purposes here.
> - improve performance of memcg.
> - remove lock_page_cgroup()
> - making page_cgroup->flags to be atomic_ops.
> - support mem+swap controller.
>
> But this is still under test and the series is not well organised.
> and base tree is old. (2.6.27-rc1-mm1) I'll rebase this set to newer mmtom tree.
>
> Maybe this set have some troubles/objections but I think the direction is not bad.
>
> Patch description. (patch ordering is bad. I'll fix in the next post.)
>
> [1/9] ... private_counter ...replace res_counter with my own counter.
> This is for supporting mem+swap controller.
> (And I think memcg has a bit different characteristics from other
> users of res_counter....)
>
> [2/9] ... change-order-uncharge ...
> This patch is for making it easy to handle swap-cache.
>
> [3/9] ... atomic_flags
> This patch changes operations for page_cgroup->flags to be atomic_ops.
>
> [4/9] ... delayed freeing.
> delaying to free page_cgroup at uncharge.
>
> [5/9] ... RCU freeing of page_cgroup
> free page_cgroup by RCU.
>
> [6/9] ... lockress page cgroup.
> remove lock_page_cgroup() and use RCU semantics.
>
> [7/9] ... add preftech
> add prefetch() macro
>
> [8/9] ... mem+swap controller base.
> introduce mem+swap controller. A bit big patch....but have tons of TODO.
> and have troubles. (it seems it's difficult to cause OOM killer.)
>
> [9/9] ... mem+swap controller control files.
> add mem+swap controller's control files.
>
> I'd like to push patch [2,3,4,5,6,7] first.
>

I took a quick look at the patches, patch 1 seemed not so clear, why can't we
enhance or fix resource counters? I'll review/test the patches tonight.

--
Balbir


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