|| ||Tejun Heo <email@example.com> |
|| ||firstname.lastname@example.org, email@example.com,
firstname.lastname@example.org, email@example.com |
|| ||[PATCHSET cgroup/for-3.8] netprio_cgroup: implement hierarchy support |
|| ||Fri, 16 Nov 2012 11:20:16 -0800|
|| ||firstname.lastname@example.org, email@example.com,
|| ||Article, Thread
This patchset implements hierarchy support for netprio_cgroup.
netprio_cgroup along with netcls_cgroup is a rather weird in that it
really isn't about resource control. It just hitches on cgroup as a
convenient mechanism to do stuff to groups of tasks. The hierarchy
support reflects such nature. There's no limit being imposed from
ancestors. It simply propagates configuration downwards until there's
a node with its own config. IOW, any given cgroup inherits priorities
from its parent for all netdevs which it doesn't have its own config
As a parent isn't affected by child inheriting its config, the
hierarchy implementation is pretty simple. It's enough to inherit
config from ->css_online() and propagate new config downwards from
write_priomap(). As each node needs to know which config is its local
one and which is inherited, an extra config array is added -
netprio_map->aux. It's a separate array to avoid disturbing spatial
locality of ->priomap. While it currently contains single one-bit
flag, I still made it a struct so that adding more configuration
(e.g. max_prio) is easy.
Note that this does change userland-visible behavior. Now, nesting is
allowed and cgroups at the first level inherit priorities from the
root cgroup. I can't think of any better way than just biting the
bullet here. :(
0001 adds cgroup->id. This will eventually replace css_id.
0002-0006 are prep patches.
0007 implements is_local flag which tracks whether a cgroup has its
own config or should inherit from its parent.
0008 implements hierarchy support.
This patchset is on top of
cgroup/for-3.8 ef9fe980c6 ("cgroup_freezer: implement proper hierarchy support")
+  "[PATCHSET cgroup/for-3.8] cgroup: allow ->post_create() to fail"
+  "[PATCH 1/2] cgroup: s/CGRP_CLONE_CHILDREN/CGRP_CPUSET_CLONE_CHILDREN/"
"[PATCH 2/2] cgroup, cpuset: remove cgroup_subsys->post_clone()"
and available in the following git branch.
Documentation/cgroups/net_prio.txt | 21 +-
include/linux/cgroup.h | 2
include/net/netprio_cgroup.h | 21 +-
kernel/cgroup.c | 15 +
net/core/netprio_cgroup.c | 376 +++++++++++++++++++++++--------------
5 files changed, 284 insertions(+), 151 deletions(-)
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