linux-kernel - [PATCHSET cgroup/for-3.8] cgroup_freezer: implement proper hierarchy support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1351931915-1701-1-git-send-email-tj@kernel.org>
Date:	Sat,  3 Nov 2012 01:38:26 -0700
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com, mhocko@...e.cz, rjw@...k.pl
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	fweisbec@...il.com
Subject: [PATCHSET cgroup/for-3.8] cgroup_freezer: implement proper hierarchy support

Hello,

This patchset implement proper hierarchy support for cgroup_freezer as
discussed in "[RFC] cgroup TODOs"[1].

The patchset first implements generic cgroup iteration macros -
cgroup_for_each_children(), cgroup_for_each_descendant_{pre|post}().
Combined with the newly introduced ->post_create() callback, this
allows controllers to implement reliable iteration over descendants
without messing with cgroup internal locking.  Controllers can perform
reliable walking using simple hierarchy-wide locking or finer-grained
parent-children locking.

Using the iteration macros and ->post_create(), cgroup_freezer is
updated to propagate state updates to and collect FROZEN completions
from the descendants.  This removes .broken_hierarchy marking from
cgroup_freezer.

cgroup_freezer hierarchy support is implemented using finer-grained
locking not necessarily because it's necessary but more because I
wanted an example controller doing that.

This patchset contains the following nine patches.

 0001-cgroup-add-cgroup_subsys-post_create.patch
 0002-cgroup-Use-rculist-ops-for-cgroup-children.patch
 0003-cgroup-implement-generic-child-descendant-walk-macro.patch
 0004-cgroup_freezer-trivial-cleanups.patch
 0005-cgroup_freezer-prepare-freezer_change_state-for-full.patch
 0006-cgroup_freezer-make-freezer-state-mask-of-flags.patch
 0007-cgroup_freezer-introduce-CGROUP_FREEZING_-SELF-PAREN.patch
 0008-cgroup_freezer-add-post_create-and-pre_destroy-and-t.patch
 0009-cgroup_freezer-implement-proper-hierarchy-support.patch

0001-0003 implement cgroup descendant iterators.

0004-0008 prepare cgroup_freezer for hierarchy support.  0009
implements it.

This patchset is on top of

 v3.6 (a0d271cbfe)
+ [2] the first three patches of
      "memcg/cgroup: do not fail fail on pre_destroy callbacks" patchset
+ [3] "cgroup: simplify cgroup removal path" v2 patchset

with cgroup/for-3.8 pulled into it.  The branch is rather floaty at
the moment so it would be the easiest to pull the following branch for
review.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup_freezer-hierarchy

Thanks.

 kernel/cgroup.c         |  106 +++++++++++++-
 kernel/cgroup_freezer.c |  359 +++++++++++++++++++++++++++++++++++-------------
 3 files changed, 445 insertions(+), 104 deletions(-)

--
tejun

[1] http://thread.gmane.org/gmane.linux.kernel.containers/23698
[2] http://thread.gmane.org/gmane.linux.kernel.cgroups/4757
[3] http://thread.gmane.org/gmane.linux.kernel.cgroups/4861
--
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/