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SubjectRe: [PATCHSET cgroup/for-3.17] cgroup, blkcg, memcg: make blkcg depend on memcg on unified hierarchy
Hi Tejun,

On 2014/6/28 9:03, Tejun Heo wrote:
> Hello, guys.
>
> Currently, the blkio subsystem attributes all of writeback IOs to the
> root. One of the issues is that there's no way to tell who originated
> a writeback IO from block layer. Those IOs are usually issued
> asynchronously from a task which didn't have anything to do with
> actually generating the dirty pages. The memory subsystem, when
> enabled, already keeps track of the ownership of each dirty page and
> it's desirable for blkio to piggyback instead of adding its own
> per-page tag.

It's great to see this being worked on!

>
> This can be achieved on the unified hierarchy without too much
> difficulty. This patchset implements a dependency mechanism in the
> cgroup such that a subsystem can depends on other subsystems. If
> available, the depended-upon subsystems are enabled together
> implicitly when the subsystem is turned on. Implicitly enabled
> subsystems are invisible and the dependencies are transparent to
> userland.
>
> This patchset implements the dependency mechanism in cgroup core and
> make blkcg depend on memcg. This doesn't actually solve the writeback
> problem yet but is an important step.
>
> This patchset contains the following six patches.
>
> 0001-cgroup-reorganize-cgroup_subtree_control_write.patch
> 0002-cgroup-introduce-cgroup-subtree_control.patch
> 0003-cgroup-make-interface-files-visible-iff-enabled-on-c.patch
> 0004-cgroup-implement-cgroup_subsys-css_reset.patch
> 0005-cgroup-implement-cgroup_subsys-depends_on.patch
> 0006-blkcg-memcg-make-blkcg-depend-on-memcg-on-the-defaul.patch
>
> 0001-0005 gradually implement the dependency mechanism.
>
> 0006 makes blkcg depend on memcg.
>
> This patchset is on top of a497c3ba1d97 ("Linux 3.16-rc2") and
> available in the following git branch.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-dependency
>
> diffstat follows. Thanks.
>
> Documentation/cgroups/cgroups.txt | 14 +
> Documentation/cgroups/unified-hierarchy.txt | 23 ++-
> block/blk-cgroup.c | 7
> include/linux/cgroup.h | 20 ++
> kernel/cgroup.c | 201 ++++++++++++++++++++++------
> mm/memcontrol.c | 24 +++
> 6 files changed, 243 insertions(+), 46 deletions(-)
>

Acked-by: Li Zefan <lizefan@huawei.com>



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