1. 23 8月, 2019 4 次提交
  2. 22 8月, 2019 3 次提交
  3. 21 8月, 2019 5 次提交
  4. 20 8月, 2019 3 次提交
  5. 19 8月, 2019 1 次提交
  6. 16 8月, 2019 2 次提交
    • T
      writeback, cgroup: inode_switch_wbs() shouldn't give up on wb_switch_rwsem trylock fail · 6444f47e
      Tejun Heo 提交于
      As inode wb switching may make sync(2) miss some inodes, they're
      synchronized using wb_switch_rwsem so that no wb switching happens
      while sync(2) is in progress.  In addition to synchronizing the actual
      switching, the rwsem is also used to prevent queueing new switch
      attempts while sync(2) is in progress.  This is to avoid queueing too
      many instances while the rwsem is held by sync(2).  Unfortunately,
      this is too agressive and can block wb switching for a long time if
      sync(2) is frequent.
      
      The goal is avoiding expolding the number of scheduled switches, not
      avoiding scheduling anything.  Let's use wb_switch_rwsem only for
      synchronizing the actual switching and sync(2) and use
      isw_nr_in_flight instead for limiting the maximum number of scheduled
      switches.  The limit is set to 1024 which should be more than enough
      while still avoiding extreme situations.
      Reviewed-by: NJan Kara <jack@suse.cz>
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      6444f47e
    • T
      writeback, cgroup: Adjust WB_FRN_TIME_CUT_DIV to accelerate foreign inode switching · 55a694df
      Tejun Heo 提交于
      WB_FRN_TIME_CUT_DIV is used to tell the foreign inode detection logic
      to ignore short writeback rounds to prevent getting confused by a
      burst of short writebacks.  The parameter is currently 2 meaning that
      anything smaller than half of the running average writback duration
      will be ignored.
      
      This is unnecessarily aggressive.  The detection logic uses 16 history
      slots and is already reasonably protected against some short bursts
      confusing it and the current parameter can lead to tens of seconds of
      missed detection depending on the writeback pattern.
      
      Let's change the parameter to 8, so that it only ignores writeback
      with are smaller than 12.5% of the current running average.
      
      v2: Add comment explaining what's going on with the foreign detection
          parameters.
      Reviewed-by: NJan Kara <jack@suse.cz>
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Signed-off-by: NJens Axboe <axboe@kernel.dk>
      55a694df
  7. 14 8月, 2019 1 次提交
  8. 12 8月, 2019 1 次提交
  9. 09 8月, 2019 3 次提交
  10. 08 8月, 2019 12 次提交
  11. 06 8月, 2019 4 次提交
  12. 05 8月, 2019 1 次提交