blkcg: move refcnt to blkcg core

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Currently, blkcg policy implementations manage blkg refcnt duplicating
mostly identical code in both policies.  This patch moves refcnt to
blkg and let blkcg core handle refcnt and freeing of blkgs.

* cfq blkgs now also get freed via RCU.

* cfq blkgs lose RB_EMPTY_ROOT() sanity check on blkg free.  If
  necessary, we can add blkio_exit_group_fn() to resurrect this.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Tejun Heo 2012-03-05 13:15:15 -08:00 • committed by Jens Axboe

parent 0381411e4b

commit 1adaf3dde3

4 changed files with 73 additions and 102 deletions

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24

block/blk-cgroup.c

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35

block/blk-cgroup.h

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58

block/blk-throttle.c

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58

block/cfq-iosched.c

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