[PATCHSET v2 block/for-4.3] blkcg: blkcg stats cleanup

[Tejun Heo]

Hello,

This is v2 of blkcg stats cleanup patchset.  Changes from the last
take[L] are

* The following patches added to consolidate blkcg entry point and
  blkg creation.  This is in itself is an improvement and helps
  colllecting common stats on bio issue.

  0002-blkcg-inline-__-blkg_lookup.patch
  0003-blkcg-move-root-blkg-lookup-optimization-from-throtl.patch
  0004-blk-throttle-improve-queue-bypass-handling.patch
  0005-blkcg-consolidate-blkg-creation-in-blkcg_bio_issue_c.patch

* per-blkg stats now accounted on bio issue rather than request
  completion so that bio based and request based drivers can behave
  the same way.  The issue was spotted by Vivek.

blkcg's stats have always been somwhat of a mess.  This patchset tries
to improve the situation a bit.

* cfq-iosched implements custom recursive stats and blk-throttle
  implements custom per-cpu stats.  This patchset make blkcg core
  support both by default.

* cfq-iosched and blk-throttle keep track of the same stats multiple
  times.  Unify them.

This patchset contains the following ten patches.

 0001-cgroup-make-cftype-private-a-unsigned-long.patch
 0002-blkcg-inline-__-blkg_lookup.patch
 0003-blkcg-move-root-blkg-lookup-optimization-from-throtl.patch
 0004-blk-throttle-improve-queue-bypass-handling.patch
 0005-blkcg-consolidate-blkg-creation-in-blkcg_bio_issue_c.patch
 0006-blkcg-add-blkg_-rw-stat-aux_cnt-and-replace-cfq_grou.patch
 0007-blkcg-make-blkcg_-rw-stat-per-cpu.patch
 0008-blkcg-make-blkg_-rw-stat_recursive_sum-to-be-able-to.patch
 0009-blkcg-move-io_service_bytes-and-io_serviced-stats-in.patch
 0010-blkcg-remove-cfqg_stats-sectors.patch

0001-0005 are prep patches.  0006-0008 make blkg stats per-cpu.
0009-0010 consolidate common stats across policies.

This patchset is also available in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-blkcg-stats-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
+ [3] [PATCHSET v3 block/for-4.3] blkcg: blkcg policy methods and data handling cleanup

diffstat follows.  Thanks.

 block/blk-cgroup.c          |  215 +++++++++++++++++++++++++-----------
 block/blk-core.c            |    4 
 block/blk-throttle.c        |  188 ++-----------------------------
 block/blk.h                 |    5 
 block/cfq-iosched.c         |  241 ++++++++++++++++++----------------------
 include/linux/blk-cgroup.h  |  261 ++++++++++++++++++++++++++++++++------------
 include/linux/cgroup-defs.h |    2 
 7 files changed, 471 insertions(+), 445 deletions(-)

--
tejun

[L] http://lkml.kernel.org/g/1435268337-1738-1-git-send-email-tj@xxxxxxxxxx
[1] http://lkml.kernel.org/g/1436281823-1947-1-git-send-email-tj@xxxxxxxxxx
[2] http://lkml.kernel.org/g/1436283361-3889-1-git-send-email-tj@xxxxxxxxxx
[3] http://lkml.kernel.org/g/1436637654-28110-1-git-send-email-tj@xxxxxxxxxx
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