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author | Tejun Heo <tj@kernel.org> | 2013-01-09 16:05:10 (GMT) |
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committer | Tejun Heo <tj@kernel.org> | 2013-01-09 16:05:10 (GMT) |
commit | 3c547865902e9fc30dc15941f326fd8039c6628d (patch) | |
tree | e86d926e86258cfc69d6665e28551fa14267634e /block/cfq-iosched.c | |
parent | 93e6d5d8f5c909479623c6ab4427f038c6c3f63f (diff) | |
download | linux-fsl-qoriq-3c547865902e9fc30dc15941f326fd8039c6628d.tar.xz |
blkcg: make blkcg_gq's hierarchical
Currently a child blkg (blkcg_gq) can be created even if its parent
doesn't exist. ie. Given a blkg, it's not guaranteed that its
ancestors will exist. This makes it difficult to implement proper
hierarchy support for blkcg policies.
Always create blkgs recursively and make a child blkg hold a reference
to its parent. blkg->parent is added so that finding the parent is
easy. blkcg_parent() is also added in the process.
This change can be visible to userland. e.g. while issuing IO in a
nested cgroup didn't affect the ancestors at all, now it will
initialize all ancestor blkgs and zero stats for the request_queue
will always appear on them. While this is userland visible, this
shouldn't cause any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'block/cfq-iosched.c')
0 files changed, 0 insertions, 0 deletions