1. 02 Nov, 2018 1 commit
  2. 20 Oct, 2018 1 commit
  3. 24 Sep, 2018 5 commits
  4. 22 Sep, 2018 3 commits
  5. 06 Sep, 2018 1 commit
  6. 24 Jul, 2018 2 commits
  7. 18 Jul, 2018 1 commit
    • Michael Callahan's avatar
      block: Add and use op_stat_group() for indexing disk_stat fields. · ddcf35d3
      Michael Callahan authored
      Add and use a new op_stat_group() function for indexing partition stat
      fields rather than indexing them by rq_data_dir() or bio_data_dir().
      This function works similarly to op_is_sync() in that it takes the
      request::cmd_flags or bio::bi_opf flags and determines which stats
      should et updated.
      
      In addition, the second parameter to generic_start_io_acct() and
      generic_end_io_acct() is now a REQ_OP rather than simply a read or
      write bit and it uses op_stat_group() on the parameter to determine
      the stat group.
      
      Note that the partition in_flight counts are not part of the per-cpu
      statistics and as such are not indexed via this function.  It's now
      indexed by op_is_write().
      
      tj: Refreshed on top of v4.17.  Updated to pass around REQ_OP.
      Signed-off-by: default avatarMichael Callahan <michaelcallahan@fb.com>
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Joshua Morris <josh.h.morris@us.ibm.com>
      Cc: Philipp Reisner <philipp.reisner@linbit.com>
      Cc: Matias Bjorling <mb@lightnvm.io>
      Cc: Kent Overstreet <kent.overstreet@gmail.com>
      Cc: Alasdair Kergon <agk@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      ddcf35d3
  8. 09 Jul, 2018 2 commits
    • Tejun Heo's avatar
      swap,blkcg: issue swap io with the appropriate context · 0d3bd88d
      Tejun Heo authored
      For backcharging we need to know who the page belongs to when swapping
      it out.  We don't worry about things that do ->rw_page (zram etc) at the
      moment, we're only worried about pages that actually go to a block
      device.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      0d3bd88d
    • Josef Bacik's avatar
      block: add bi_blkg to the bio for cgroups · 08e18eab
      Josef Bacik authored
      Currently io.low uses a bi_cg_private to stash its private data for the
      blkg, however other blkcg policies may want to use this as well.  Since
      we can get the private data out of the blkg, move this to bi_blkg in the
      bio and make it generic, then we can use bio_associate_blkg() to attach
      the blkg to the bio.
      
      Theoretically we could simply replace the bi_css with this since we can
      get to all the same information from the blkg, however you have to
      lookup the blkg, so for example wbc_init_bio() would have to lookup and
      possibly allocate the blkg for the css it was trying to attach to the
      bio.  This could be problematic and result in us either not attaching
      the css at all to the bio, or falling back to the root blkcg if we are
      unable to allocate the corresponding blkg.
      
      So for now do this, and in the future if possible we could just replace
      the bi_css with bi_blkg and update the helpers to do the correct
      translation.
      Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      08e18eab
  9. 08 Jun, 2018 1 commit
  10. 02 Jun, 2018 1 commit
  11. 30 May, 2018 2 commits
  12. 14 May, 2018 5 commits
  13. 01 Mar, 2018 1 commit
  14. 06 Jan, 2018 2 commits
  15. 20 Dec, 2017 1 commit
    • Shaohua Li's avatar
      block-throttle: avoid double charge · 111be883
      Shaohua Li authored
      If a bio is throttled and split after throttling, the bio could be
      resubmited and enters the throttling again. This will cause part of the
      bio to be charged multiple times. If the cgroup has an IO limit, the
      double charge will significantly harm the performance. The bio split
      becomes quite common after arbitrary bio size change.
      
      To fix this, we always set the BIO_THROTTLED flag if a bio is throttled.
      If the bio is cloned/split, we copy the flag to new bio too to avoid a
      double charge. However, cloned bio could be directed to a new disk,
      keeping the flag be a problem. The observation is we always set new disk
      for the bio in this case, so we can clear the flag in bio_set_dev().
      
      This issue exists for a long time, arbitrary bio size change just makes
      it worse, so this should go into stable at least since v4.2.
      
      V1-> V2: Not add extra field in bio based on discussion with Tejun
      
      Cc: Vivek Goyal <vgoyal@redhat.com>
      Cc: stable@vger.kernel.org
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Signed-off-by: default avatarShaohua Li <shli@fb.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      111be883
  16. 11 Nov, 2017 2 commits
  17. 11 Oct, 2017 1 commit
  18. 26 Sep, 2017 1 commit
  19. 07 Sep, 2017 1 commit
    • Huang Ying's avatar
      mm: test code to write THP to swap device as a whole · 225311a4
      Huang Ying authored
      To support delay splitting THP (Transparent Huge Page) after swapped
      out, we need to enhance swap writing code to support to write a THP as a
      whole.  This will improve swap write IO performance.
      
      As Ming Lei <ming.lei@redhat.com> pointed out, this should be based on
      multipage bvec support, which hasn't been merged yet.  So this patch is
      only for testing the functionality of the other patches in the series.
      And will be reimplemented after multipage bvec support is merged.
      
      Link: http://lkml.kernel.org/r/20170724051840.2309-7-ying.huang@intel.comSigned-off-by: default avatar"Huang, Ying" <ying.huang@intel.com>
      Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Jens Axboe <axboe@kernel.dk>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@kernel.org>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Ross Zwisler <ross.zwisler@intel.com> [for brd.c, zram_drv.c, pmem.c]
      Cc: Shaohua Li <shli@kernel.org>
      Cc: Vishal L Verma <vishal.l.verma@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      225311a4
  20. 23 Aug, 2017 1 commit
    • Christoph Hellwig's avatar
      block: replace bi_bdev with a gendisk pointer and partitions index · 74d46992
      Christoph Hellwig authored
      This way we don't need a block_device structure to submit I/O.  The
      block_device has different life time rules from the gendisk and
      request_queue and is usually only available when the block device node
      is open.  Other callers need to explicitly create one (e.g. the lightnvm
      passthrough code, or the new nvme multipathing code).
      
      For the actual I/O path all that we need is the gendisk, which exists
      once per block device.  But given that the block layer also does
      partition remapping we additionally need a partition index, which is
      used for said remapping in generic_make_request.
      
      Note that all the block drivers generally want request_queue or
      sometimes the gendisk, so this removes a layer of indirection all
      over the stack.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      74d46992
  21. 09 Aug, 2017 1 commit
  22. 03 Jul, 2017 4 commits