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Date: Sat, 21 Jan 2012 19:25:08 -0800 From: Tejun Heo <tj@...nel.org> To: axboe@...nel.dk, vgoyal@...hat.com Cc: ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org Subject: [PATCHSET] blkcg: kill policy node and blkg->dev, take#2 Hello, guys. This is the second take of blkcg-kill-policy-node-and-blkg_dev patchset. Changes from the last take[L] are, * 0001-blkcg-make-CONFIG_BLK_CGROUP-bool.patch added to allow caling into blkcg from block core to clear blkg's on elevator switch. * For patches 0005-0008 added. These ensure that blkcg policies are quiescent and no blkg exists during elevator switch. 0005-0006 are lifted from the pending second patchset and will be used for policy registration too. * 0013-blkcg-use-the-usual-get-blkg-path-for-root-blkio_gro.patch fixed for !CONFIG_CFQ_GROUP_IOSCHED. * 0009-blkcg-move-rcu_read_lock-outside-of-blkio_group-get-.patch is the 0001 RCU fix patch. It turns out the RCU lock isn't protecting blkg at all but blkcg. Patch description updated accordingly. The next patchset will update blkcg such that there's one blkg per cgroup - request_queue association. Initially, all blkg's will contain data for all policies registered on the system but policy registration will be made per-request_queue. The original patchset description follows. blk-cgroup, blk-throttle and cfq-iosched are pretty tightly tangled and untangling requires seemingly unrelated changes and addition of some transitional stuff. Some are in this patchset but they'll be more prominent in the second patchset. With that said, this patchset concentrates on removing blkio_policy_node and blkio_group->dev. blkio_policy_node carries configuration per cgroup-request_queue association separately from the matching blkio_group. The goal seems to be allowing configuration of missing devices and retaining configuration across hot unplug/plug cycles. Such behavior is very different from existing conventions, misleading and unnecessary. This patchset moves configuration to blkio_group and removes blkio_policy_node. blkg->dev removal is much simpler. blkg->dev is used to print out device number when printing out per-device configurations or statistics. The device name can be easily determined by following the associated request_queue from blkg instead. This patchset contains the following 17 patches. 0001-blkcg-make-CONFIG_BLK_CGROUP-bool.patch 0002-cfq-don-t-register-propio-policy-if-CONFIG_CFQ_GROUP.patch 0003-elevator-clear-auxiliary-data-earlier-during-elevato.patch 0004-elevator-make-elevator_init_fn-return-0-errno.patch 0005-block-implement-blk_queue_bypass_start-end.patch 0006-block-extend-queue-bypassing-to-cover-blkcg-policies.patch 0007-blkcg-make-blkio_list_lock-irq-safe.patch 0008-blkcg-shoot-down-blkio_groups-on-elevator-switch.patch 0009-blkcg-move-rcu_read_lock-outside-of-blkio_group-get-.patch 0010-blkcg-update-blkg-get-functions-take-blkio_cgroup-as.patch 0011-blkcg-use-q-and-plid-instead-of-opaque-void-for-blki.patch 0012-blkcg-add-blkio_policy-array-and-allow-one-policy-pe.patch 0013-blkcg-use-the-usual-get-blkg-path-for-root-blkio_gro.patch 0014-blkcg-factor-out-blkio_group-creation.patch 0015-blkcg-don-t-allow-or-retain-configuration-of-missing.patch 0016-blkcg-kill-blkio_policy_node.patch 0017-blkcg-kill-the-mind-bending-blkg-dev.patch 0001-0004: misc preps including elevator switch update 0005-0008: ensure blkcg policies are quiescent across elvswitch 0009-0014: move common part of blkg management into blkcg core 0015-0016: kill blkio_policy_node 0017 : kill blkg->dev This patchset is on top of v3.3-rc1 and also available in the following git branch. git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-kill-pn block/Kconfig.iosched | 5 block/blk-cgroup.c | 684 +++++++++++++++-------------------------------- block/blk-cgroup.h | 106 ++----- block/blk-core.c | 53 +++ block/blk-throttle.c | 266 +++++------------- block/blk.h | 6 block/cfq-iosched.c | 286 +++++++------------ block/cfq.h | 7 block/deadline-iosched.c | 8 block/elevator.c | 115 +++---- block/noop-iosched.c | 8 include/linux/blkdev.h | 5 include/linux/elevator.h | 2 init/Kconfig | 2 14 files changed, 568 insertions(+), 985 deletions(-) Thanks. -- tejun [L] http://thread.gmane.org/gmane.linux.kernel/1241094 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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