Hi Andrew,
After several rounds of review, parts of the memcg page accounting
patchset is ready (leaving memcg dirty page accounting under more
review):
1/8 memcg: remove MEMCG_NR_FILE_MAPPED
2/8 ceph: vfs __set_page_dirty_nobuffers interface instead of doing
it inside filesystem
3/8 memcg: check for proper lock held in mem_cgroup_update_page_stat
5/8 memcg: add per cgroup writeback pages accounting
8/8 memcg: Document cgroup dirty/writeback memory statistics
But the 2/8 ceph one has been improved again and will be merged in
ceph tree, so only the other 4 patches need to be added to -mm tree.
I've moved the 5/8 writeback one up the stack and updated the 8/8 to
only document writeback changes. Could you please merge them earlier?
I'll post these updated patches soon. :)
Thank you!
---------- Forwarded message ----------
From: Michal Hocko <mhocko@xxxxxxx>
Date: Sun, Aug 4, 2013 at 6:08 PM
Subject: Re: [PATCH V5 5/8] memcg: add per cgroup writeback pages accounting
To: Sha Zhengju <handai.szj@xxxxxxxxx>
Cc: "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>,
"linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Cgroups
<cgroups@xxxxxxxxxxxxxxx>, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@xxxxxxxxxxxxxx>, Glauber Costa <glommer@xxxxxxxxx>,
Greg Thelen <gthelen@xxxxxxxxxx>, Wu Fengguang
<fengguang.wu@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>,
Sha Zhengju <handai.szj@xxxxxxxxxx>
On Sat 03-08-13 17:25:01, Sha Zhengju wrote:
> On Thu, Aug 1, 2013 at 10:53 PM, Michal Hocko <mhocko@xxxxxxx> wrote:
> > On Thu 01-08-13 19:54:11, Sha Zhengju wrote:
> >> From: Sha Zhengju <handai.szj@xxxxxxxxxx>
> >>
> >> Similar to dirty page, we add per cgroup writeback pages accounting. The lock
> >> rule still is:
> >> mem_cgroup_begin_update_page_stat()
> >> modify page WRITEBACK stat
> >> mem_cgroup_update_page_stat()
> >> mem_cgroup_end_update_page_stat()
> >>
> >> There're two writeback interfaces to modify: test_{clear/set}_page_writeback().
> >> Lock order:
> >> --> memcg->move_lock
> >> --> mapping->tree_lock
> >>
> >> Signed-off-by: Sha Zhengju <handai.szj@xxxxxxxxxx>
> >
> > Looks good to me. Maybe I would suggest moving this patch up the stack
> > so that it might get merged earlier as it is simpler than dirty pages
> > accounting. Unless you insist on having the full series merged at once.
>
> I think the following three patches can be merged earlier:
> 1/8 memcg: remove MEMCG_NR_FILE_MAPPED
> 3/8 memcg: check for proper lock held in mem_cgroup_update_page_stat
> 5/8 memcg: add per cgroup writeback pages accounting
>
> Do I need to resent them again for you or they're enough?
This is a question for Andrew. I would go with them as they are.
> One more word, since dirty accounting is essential to future memcg
> dirty page throttling and it is not an optional feature now, I suspect
> whether we can merge the following two as well and leave the overhead
> optimization a separate series. :p
I wouldn't hurry it. We need numbers for serious testing to see the
overhead. It is still just a small step towards dirty throttling.
> 4/5 memcg: add per cgroup dirty pages accounting
> 8/8 memcg: Document cgroup dirty/writeback memory statistics
>
> The 2/8 ceph one still need more improvement, I'll separate it next version.
>
> >
> > Acked-by: Michal Hocko <mhocko@xxxxxxx>
>
> Thank you.
[...]
--
Michal Hocko
SUSE Labs
--
Thanks,
Sha
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