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Message-Id: <1386361672-27791-1-git-send-email-tj@kernel.org>
Date: Fri, 6 Dec 2013 15:27:45 -0500
From: Tejun Heo <tj@...nel.org>
To: lizefan@...wei.com
Cc: containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, vdavydov@...allels.com
Subject: [PATCHSET REPOST cgroup/for-3.14] cgroup: factor out css creation into create_css()
Hello,
This is repost of the following.
http://thread.gmane.org/gmane.linux.kernel.cgroups/8981
It got reviewed and acked then but I somehow forgot apply and Vladimir
reporting the same bug that the first patch in the original patch
fixed reminded me. The first patch is already applied to
cgroup/for-3.13-fixes which is pulled into for-3.14 for this series.
While the patches are not completely identical, the adjustments are
trivial. css_id got ripped out in the meantime, so "[PATCH 4/9]
cgroup: move css_id commit from cgroup_populate_dir() to online_css()"
is dropped and the patches are refreshed to reflect the dropping of
css_id handling in cgroup_create(). I'm applying the series to
cgroup/for-3.14.
The original patchset description follows. Thanks and sorry about the
messup.
For unified hierarchy, a css's (cgroup_subsys_state) lifetime will be
different from that of the associated cgroup. css's may be created
and destroyed dynamically over the lifetime of a single cgroup. The
previous changes decoupled css destruction from cgroup's. This
patchset decouples css creation from cgroup's.
This patchset contains the following seven patches.
0001-cgroup-css-iterations-and-css_from_dir-are-safe-unde.patch
0002-cgroup-make-for_each_subsys-useable-under-cgroup_roo.patch
0003-cgroup-reorder-operations-in-cgroup_create.patch
0004-cgroup-combine-css-handling-loops-in-cgroup_create.patch
0005-cgroup-factor-out-cgroup_subsys_state-creation-into-.patch
0006-cgroup-implement-for_each_css.patch
0007-cgroup-remove-for_each_root_subsys.patch
0001-0002 are prep patches.
0003-0005 collect css creation operations into single loop and factor
it out into create_css().
0006-0007 are somewhat tangential. As everything is css based now and
the enabled set of css's might be differ depending on the specific
cgroup in the future, they introduce for_each_css() and replace most
uses of for_each_root_subsys() with it. The two left overs are
opencoded and for_each_root_subsys() and the related logic are
removed.
This patchset shouldn't bring any userland noticeable behavior
changes. It's on top of cgroup/for-3.12 d1625964da ("cgroup: fix
cgroup_css() invocation in css_from_id()") and available in the
following git branch.
include/linux/cgroup.h | 9 -
kernel/cgroup.c | 300 ++++++++++++++++++++++++++-----------------------
2 files changed, 161 insertions(+), 148 deletions(-)
--
tejun
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