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Date: Fri, 4 Jul 2014 14:29:17 +0800 From: Li Zefan <lizefan@...wei.com> To: Tejun Heo <tj@...nel.org> CC: <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <hannes@...xchg.org>, <mhocko@...e.cz>, <vgoyal@...hat.com>, <axboe@...nel.dk> Subject: Re: [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@...wei.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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