Hello,
Until now, cgroup->id has been used to identify all the associated
csses and css_from_id() takes cgroup ID and returns the matching css
by looking up the cgroup and then dereferencing the css associated
with it; however, now that the lifetimes of cgroup and css are
separate, this is incorrect and breaks on the unified hierarchy when a
controller is disabled and enabled back again before the previous
instance is released.
This series adds css->id which is a subsystem-unique ID and converts
css_from_id() to look up by the new css->id instead. memcg is the
only user of css_from_id() and also converted to use css->id instead.
0001-cgroup-make-flags-and-subsys_masks-unsigned-int.patch
0002-cgroup-memcg-allocate-cgroup-ID-from-1.patch
0003-cgroup-protect-cgroup_root-cgroup_idr-with-a-spinloc.patch
0004-cgroup-use-RCU-free-in-create_css-failure-path.patch
0005-cgroup-update-init_css-into-init_and_link_css.patch
0006-cgroup-memcg-implement-css-id-and-convert-css_from_i.patch
0001-0003 are related prep/cleanups.
0004-0006 add css->id and convert css_from_id() and its user to it.
This patchset is on top of
cgroup/for-3.16 f8f22e53a262 ("cgroup: implement dynamic subtree controller
enable/disable on the default hierarchy")
+ [1] [PATCHSET cgroup/for-3.16] cgroup: implement cgroup.populated
+ [2] Misc comment / warning cleanups
and available in the following git branch.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-css_id
diffstat follows.
include/linux/cgroup.h | 21 ++++--
kernel/cgroup.c | 164 ++++++++++++++++++++++++++++++++-----------------
mm/memcontrol.c | 10 --
3 files changed, 126 insertions(+), 69 deletions(-)
Thanks.
--
tejun
[1] http://lkml.kernel.org/g/1397056052-2829-1-git-send-email...@kernel.org
[2] http://lkml.kernel.org/g/1397748555-6647-1-git-send-email-nasa4...@gmail.com
http://lkml.kernel.org/g/1397748544-6570-1-git-send-email-nasa4...@gmail.com
http://lkml.kernel.org/g/1397748534-6490-1-git-send-email-nasa4...@gmail.com
http://lkml.kernel.org/g/1397757955.3104.11.camel@joe-AO725
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