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Subject[PATCHSET cgroup/for-3.16] cgroup: implement cgroup.populated
Date
Hello,

(inotify folks, can you please review the second patch which hooks up
kernfs_notify() with fsnotify? It works but directly invoking
fsnotify_parent() and fsnotify() feels a bit dirty. Maybe something
like fsnotify_notify_modify_by_dentry() would make more sense?)

cgroup users often need a way to determine when a cgroup's
subhierarchy becomes empty so that it can be cleaned up. cgroup
currently provides release_agent for it; unfortunately, this mechanism
is riddled with issues. This patchset implements a replacement
mechanism "cgroup.subtree_populated" which can be used to monitor
whether the cgroup's subhierarchy has tasks in it or not and triggers
poll and [di]notify events when its content changes.

This patchset contains the following three patches.

0001-kernfs-implement-kernfs_root-supers-list.patch
0002-kernfs-make-kernfs_notify-trigger-inotify-events-too.patch
0003-cgroup-implement-cgroup.subtree_populated-for-the-de.patch

0001-0002 add [di]notify notification to kernfs_notify().

0003 implements cgroup.subtree_populated.

This patchset is on top of "cgroup: implement unified hierarchy"
patchset[1] and availalbe in the following git branch.

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

diffstat follows.

fs/kernfs/dir.c | 1
fs/kernfs/file.c | 41 +++++++++++++++++++++++----
fs/kernfs/kernfs-internal.h | 5 +++
fs/kernfs/mount.c | 11 +++++++
include/linux/cgroup.h | 15 ++++++++++
include/linux/kernfs.h | 4 ++
kernel/cgroup.c | 65 +++++++++++++++++++++++++++++++++++++++++---
7 files changed, 132 insertions(+), 10 deletions(-)

--
tejun

[1] http://lkml.kernel.org/g/1395974461-12735-1-git-send-email-tj@kernel.org


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