• Linus Torvalds's avatar
    Merge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block · b0a1ea51
    Linus Torvalds authored
    Pull blk-cg updates from Jens Axboe:
     "A bit later in the cycle, but this has been in the block tree for a a
      while.  This is basically four patchsets from Tejun, that improve our
      buffered cgroup writeback.  It was dependent on the other cgroup
      changes, but they went in earlier in this cycle.
    
      Series 1 is set of 5 patches that has cgroup writeback updates:
    
       - bdi_writeback iteration fix which could lead to some wb's being
         skipped or repeated during e.g. sync under memory pressure.
    
       - Simplification of wb work wait mechanism.
    
       - Writeback tracepoints updated to report cgroup.
    
      Series 2 is is a set of updates for the CFQ cgroup writeback handling:
    
         cfq has always charged all async IOs to the root cgroup.  It didn't
         have much choice as writeback didn't know about cgroups and there
         was no way to tell who to blame for a given writeback IO.
         writeback finally grew support for cgroups and now tags each
         writeback IO with the appropriate cgroup to charge it against.
    
         This patchset updates cfq so that it follows the blkcg each bio is
         tagged with.  Async cfq_queues are now shared across cfq_group,
         which is per-cgroup, instead of per-request_queue cfq_data.  This
         makes all IOs follow the weight based IO resource distribution
         implemented by cfq.
    
         - Switched from GFP_ATOMIC to GFP_NOWAIT as suggested by Jeff.
    
         - Other misc review points addressed, acks added and rebased.
    
      Series 3 is the blkcg policy cleanup patches:
    
         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.
    
      And finally, series 4 is a set of patches cleaning up the blkcg stats
      handling:
    
        blkcg's stats have always been somwhat of a mess.  This patchset
        tries to improve the situation a bit.
    
         - 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.
    
         - 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.
    
         - 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"
    
    * 'for-4.3/blkcg' of git://git.kernel.dk/linux-block: (45 commits)
      blkcg: use CGROUP_WEIGHT_* scale for io.weight on the unified hierarchy
      blkcg: s/CFQ_WEIGHT_*/CFQ_WEIGHT_LEGACY_*/
      blkcg: implement interface for the unified hierarchy
      blkcg: misc preparations for unified hierarchy interface
      blkcg: separate out tg_conf_updated() from tg_set_conf()
      blkcg: move body parsing from blkg_conf_prep() to its callers
      blkcg: mark existing cftypes as legacy
      blkcg: rename subsystem name from blkio to io
      blkcg: refine error codes returned during blkcg configuration
      blkcg: remove unnecessary NULL checks from __cfqg_set_weight_device()
      blkcg: reduce stack usage of blkg_rwstat_recursive_sum()
      blkcg: remove cfqg_stats->sectors
      blkcg: move io_service_bytes and io_serviced stats into blkcg_gq
      blkcg: make blkg_[rw]stat_recursive_sum() to be able to index into blkcg_gq
      blkcg: make blkcg_[rw]stat per-cpu
      blkcg: add blkg_[rw]stat->aux_cnt and replace cfq_group->dead_stats with it
      blkcg: consolidate blkg creation in blkcg_bio_issue_check()
      blk-throttle: improve queue bypass handling
      blkcg: move root blkg lookup optimization from throtl_lookup_tg() to __blkg_lookup()
      blkcg: inline [__]blkg_lookup()
      ...
    b0a1ea51
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