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[PATCHSET v3 block/for-4.3] blkcg: blkcg policy methods and data handling cleanup

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This is v3 of blkcg_policy methods cleanup patchset.  Changes from the
last take [L] are

* Rebased on top of block/for-linus.

* 0003-blkcg-remove-unnecessary-blkcg_root-handling-from-cs.patch and
  0004-blkcg-restructure-blkg_policy_data-allocation-in-blk.patch
  added.  These are follow-up cleanups for the blkcg_policy_data
  handling fixes which went into block/for-linus.

* 0010-blkcg-cosmetic-updates-about-blkcg_policy_data.patch and
  0011-blkcg-replace-blkcg_policy-cpd_size-with-cpd_alloc-f.patch
  added so that blkcg_policy_data handling is consistent with
  blkg_policy_data handling.

This patchset contains assorted cleanups for blkcg_policy methods and
blk[c]g_policy_data handling.

* alloc/free added for blkg_policy_data.  exit dropped.

* alloc/free added for blkcg_policy_data.

* blk-throttle's async percpu allocation is replaced with direct
  allocation.

* all methods now take blk[c]g_policy_data instead of blkcg_gq or
  blkcg.

This patchset contains the following 11 patches.

 0001-blkcg-remove-unnecessary-request_list-blkg-NULL-test.patch
 0002-blkcg-use-blkg_free-in-blkcg_init_queue-failure-path.patch
 0003-blkcg-remove-unnecessary-blkcg_root-handling-from-cs.patch
 0004-blkcg-restructure-blkg_policy_data-allocation-in-blk.patch
 0005-blkcg-make-blkcg_activate_policy-allow-NULL-pd_init_.patch
 0006-blkcg-replace-blkcg_policy-pd_size-with-pd_alloc-fre.patch
 0007-blk-throttle-remove-asynchrnous-percpu-stats-allocat.patch
 0008-blk-throttle-clean-up-blkg_policy_data-alloc-init-ex.patch
 0009-blkcg-make-blkcg_policy-methods-take-a-pointer-to-bl.patch
 0010-blkcg-cosmetic-updates-about-blkcg_policy_data.patch
 0011-blkcg-replace-blkcg_policy-cpd_size-with-cpd_alloc-f.patch

0001-0005 are misc cleanups.  0006-0008 add alloc/free methods and
remove blk-throttle's async percpu allocation mechanism.  0009 makes
all methods take blkcg_policy_data.  0010-0011 apply similar cleanups
to blkcg_policy_data handling.

This patchset is also available in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-blkcg-methods-cleanup

and is on top of

  block/for-linus 06b285bd1125 ("blkcg: fix blkcg_policy_data allocation bug")
+ [1] [PATCHSET block/for-4.3] writeback: cgroup writeback updates
+ [2] [PATCHSET v2 block/for-4.3] block, cgroup: make cfq charge async IOs to the appropriate blkcgs

diffstat follows, thanks.

 block/blk-cgroup.c         |  171 +++++++++++++++++++-------------------------
 block/blk-throttle.c       |  173 +++++++++++++--------------------------------
 block/cfq-iosched.c        |   68 +++++++++++++----
 include/linux/blk-cgroup.h |   65 ++++++++--------
 4 files changed, 214 insertions(+), 263 deletions(-)

--
tejun

[L] http://lkml.kernel.org/g/1436284293-4666-1-git-send-email-tj@kernel.org
[1] http://lkml.kernel.org/g/1436281823-1947-1-git-send-email-tj@kernel.org
[2] http://lkml.kernel.org/g/1436283361-3889-1-git-send-email-tj@kernel.org
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[PATCHSET v3 block/for-4.3] blkcg: blkcg policy methods and data handling cleanup Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 04/11] blkcg: restructure blkg_policy_data allocation in blkcg_activate_policy() Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 05/11] blkcg: make blkcg_activate_policy() allow NULL ->pd_init_fn Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 08/11] blk-throttle: clean up blkg_policy_data alloc/init/exit/free methods Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 09/11] blkcg: make blkcg_policy methods take a pointer to blkcg_policy_data Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 11/11] blkcg: replace blkcg_policy->cpd_size with ->cpd_alloc/free_fn() methods Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 10/11] blkcg: cosmetic updates about blkcg_policy_data Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 03/11] blkcg: remove unnecessary blkcg_root handling from css_alloc/free paths Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 01/11] blkcg: remove unnecessary request_list->blkg NULL test in blk_put_rl() Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200
  [PATCH 07/11] blk-throttle: remove asynchrnous percpu stats allocation mechanism Tejun Heo <tj@kernel.org> - 2015-07-11 20:10 +0200

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