Hello,
cgroup has been pretty lax about errors while creating cgroupfs files.
In most cases, it just ignores the errors and continues - cgroups
created or subsystems bound under heavy memory pressure could be
missing some files. As such low memory conditions aren't too
frequent, this hasn't caused a lot of problems but this is lousy and
we'll be creating and removing cgroupfs files a lot more dynamically
with unified hierarchy. Let's get it in proper shape.
This patchset contains the following nine patches.
0001-cgroup-minor-updates-around-cgroup_clear_directory.patch
0002-cgroup-fix-error-path-of-cgroup_addrm_files.patch
0003-cgroup-fix-cgroup_add_cftypes-error-handling.patch
0004-cgroup-separate-out-cgroup_base_files-handling-out-o.patch
0005-cgroup-update-error-handling-in-cgroup_populate_dir.patch
0006-cgroup-make-rebind_subsystems-handle-file-additions-.patch
0007-cgroup-cosmetic-follow-up-cleanups.patch
0008-cgroup-move-number_of_cgroups-test-out-of-rebind_sub.patch
0009-blkcg-make-blkcg_policy_register-correctly-handle-cg.patch
0001-0007 clean up and get proper error handling implemented so that
if a file creation fails, the whole operation fails.
0008 is trivial reorganization to prepare for unified hierarchy.
0009 updates blkcg to treat cgroup_add_cftypes(), which now behaves
correctly after a failure, error properly.
This patch is on top of cgroup/for-3.11 0ce6cba357 ("cgroup:
CGRP_ROOT_SUBSYS_BOUND should be ignored when comparing mount
options") and available in the following git branc.h
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-file-error-handling
diffstat follows.
block/blk-cgroup.c | 9 +-
kernel/cgroup.c | 212 ++++++++++++++++++++++++++++++-----------------------
2 files changed, 126 insertions(+), 95 deletions(-)
Thanks.
--
tejun
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