On Sun, Aug 04, 2013 at 07:07:03PM -0400, Tejun Heo wrote:
> Hello,
>
> I've been wanting to do this for some time and given all the recent
> API updates now seems like a pretty good opportunity. Verified
> freezer and blkcg. The conversions are mostly straight forward but
> I'd much appreciate acks from controller maintainers.
>
> The patch is on top of
>
> cgroup/for-3.12 61584e3f4 ("cgroup: Merge branch 'for-3.11-fixes' into
> for-3.12")
> + [1] cgroup: use cgroup_subsys_state as the primary subsystem interface
> handle
> + [2] cgroup: make cgroup_event specific to memcg
>
> and available in the following git branch.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
> review-descendant-update
>
> Thanks.
>
> [1] https://lkml.org/lkml/2013/8/1/722
> [2] http://thread.gmane.org/gmane.linux.kernel.cgroups/8726
>
> ------- 8< -------
>
> >From 0e84b0865ab8a87f1c1443e4777c20c7f14e13b6 Mon Sep 17 00:00:00 2001
> From: Tejun Heo <t...@kernel.org>
> Date: Sun, 4 Aug 2013 19:01:23 -0400
>
> Previously, all css descendant iterators didn't include the origin
> (root of subtree) css in the iteration. The reasons were maintaining
> consistency with css_for_each_child() and that at the time of
> introduction more use cases needed skipping the origin anyway;
> however, given that css_is_descendant() considers self to be a
> descendant, omitting the origin css has become more confusing and
> looking at the accumulated use cases rather clearly indicates that
> including origin would result in simpler code overall.
>
> While this is a change which can easily lead to subtle bugs, cgroup
> API including the iterators has recently gone through major
> restructuring and no out-of-tree changes will be applicable without
> adjustments making this a relatively acceptable opportunity for this
> type of change.
>
> The conversions are mostly straight-forward. If the iteration block
> had explicit origin handling before or after, it's moved inside the
> iteration. If not, if (pos == origin) continue; is added. Some
> conversions add extra reference get/put around origin handling by
> consolidating origin handling and the rest. While the extra ref
> operations aren't strictly necessary, this shouldn't cause any
> noticeable difference.
>
> Signed-off-by: Tejun Heo <t...@kernel.org>
> Cc: Li Zefan <lize...@huawei.com>
> Cc: Jens Axboe <ax...@kernel.dk>
> Cc: Vivek Goyal <vgo...@redhat.com>
> Cc: Matt Helsley <matth...@us.ibm.com>
> Cc: Johannes Weiner <han...@cmpxchg.org>
> Cc: Michal Hocko <mho...@suse.cz>
> Cc: Balbir Singh <bsinghar...@gmail.com>
> Cc: Aristeu Rozanski <a...@redhat.com>
> ---
> block/blk-cgroup.c | 8 ++------
> block/blk-cgroup.h | 4 +++-
> block/blk-throttle.c | 3 ---
block/ bits look good to me.
Acked-by: Vivek Goyal <vgo...@redhat.com>
Vivek
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