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authorTejun Heo <tj@kernel.org>2013-01-09 08:05:10 -0800
committerTejun Heo <tj@kernel.org>2013-01-09 08:05:10 -0800
commit3c547865902e9fc30dc15941f326fd8039c6628d (patch)
treee86d926e86258cfc69d6665e28551fa14267634e /README
parent93e6d5d8f5c909479623c6ab4427f038c6c3f63f (diff)
downloadop-kernel-dev-3c547865902e9fc30dc15941f326fd8039c6628d.zip
op-kernel-dev-3c547865902e9fc30dc15941f326fd8039c6628d.tar.gz
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>
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