1. 29 Dec, 2008 1 commit
  2. 09 Oct, 2008 2 commits
  3. 18 Dec, 2007 1 commit
  4. 24 Jul, 2007 1 commit
  5. 20 Dec, 2006 1 commit
    • Jens Axboe's avatar
      [PATCH] cfq-iosched: don't allow sync merges across queues · da775265
      Jens Axboe authored
      Currently we allow any merge, even if the io originates from different
      processes. This can cause really bad starvation and unfairness, if those
      ios happen to be synchronous (reads or direct writes).
      
      So add a allow_merge hook to the io scheduler ops, so an io scheduler can
      help decide whether a bio/process combination may be merged with an
      existing request.
      Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
      da775265
  6. 01 Dec, 2006 1 commit
  7. 12 Oct, 2006 1 commit
  8. 30 Sep, 2006 6 commits
    • David Howells's avatar
      [PATCH] BLOCK: Make it possible to disable the block layer [try #6] · 9361401e
      David Howells authored
      Make it possible to disable the block layer.  Not all embedded devices require
      it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
      the block layer to be present.
      
      This patch does the following:
      
       (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
           support.
      
       (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls
           an item that uses the block layer.  This includes:
      
           (*) Block I/O tracing.
      
           (*) Disk partition code.
      
           (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS.
      
           (*) The SCSI layer.  As far as I can tell, even SCSI chardevs use the
           	 block layer to do scheduling.  Some drivers that use SCSI facilities -
           	 such as USB storage - end up disabled indirectly from this.
      
           (*) Various block-based device drivers, such as IDE and the old CDROM
           	 drivers.
      
           (*) MTD blockdev handling and FTL.
      
           (*) JFFS - which uses set_bdev_super(), something it could avoid doing by
           	 taking a leaf out of JFFS2's book.
      
       (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and
           linux/elevator.h contingent on CONFIG_BLOCK being set.  sector_div() is,
           however, still used in places, and so is still available.
      
       (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and
           parts of linux/fs.h.
      
       (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK.
      
       (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK.
      
       (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK
           is not enabled.
      
       (*) fs/no-block.c is created to hold out-of-line stubs and things that are
           required when CONFIG_BLOCK is not set:
      
           (*) Default blockdev file operations (to give error ENODEV on opening).
      
       (*) Makes some /proc changes:
      
           (*) /proc/devices does not list any blockdevs.
      
           (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK.
      
       (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK.
      
       (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if
           given command other than Q_SYNC or if a special device is specified.
      
       (*) In init/do_mounts.c, no reference is made to the blockdev routines if
           CONFIG_BLOCK is not defined.  This does not prohibit NFS roots or JFFS2.
      
       (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return
           error ENOSYS by way of cond_syscall if so).
      
       (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if
           CONFIG_BLOCK is not set, since they can't then happen.
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      9361401e
    • Jens Axboe's avatar
      [PATCH] elevator: define ioc counting mechanism · 4a893e83
      Jens Axboe authored
      None of the in-kernel primitives for handling "atomic" counting seem
      to be a good fit. We need something that is essentially free for
      incrementing/decrementing, while the read side may be more expensive
      as we only ever need to do that when a device is removed from the
      kernel.
      
      Use a per-cpu variable for maintaining a per-cpu ioc count and define
      a reading mechanism that just sums up the values.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      4a893e83
    • Jens Axboe's avatar
      [PATCH] Drop useless bio passing in may_queue/set_request API · cb78b285
      Jens Axboe authored
      It's not needed for anything, so kill the bio passing.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      cb78b285
    • Jens Axboe's avatar
      [PATCH] elevator: introduce a way to reuse rq for internal FIFO handling · 1fbfdfcd
      Jens Axboe authored
      The io schedulers can use this instead of having to allocate space for
      it themselves.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      1fbfdfcd
    • Jens Axboe's avatar
      [PATCH] elevator: abstract out the rbtree sort handling · 2e662b65
      Jens Axboe authored
      The rbtree sort/lookup/reposition logic is mostly duplicated in
      cfq/deadline/as, so move it to the elevator core. The io schedulers
      still provide the actual rb root, as we don't want to impose any sort
      of specific handling on the schedulers.
      
      Introduce the helpers and rb_node in struct request to help migrate the
      IO schedulers.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      2e662b65
    • Jens Axboe's avatar
      [PATCH] elevator: move the backmerging logic into the elevator core · 9817064b
      Jens Axboe authored
      Right now, every IO scheduler implements its own backmerging (except for
      noop, which does no merging). That results in duplicated code for
      essentially the same operation, which is never a good thing. This patch
      moves the backmerging out of the io schedulers and into the elevator
      core. We save 1.6kb of text and as a bonus get backmerging for noop as
      well. Win-win!
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      9817064b
  9. 08 Jun, 2006 1 commit
    • Jens Axboe's avatar
      [PATCH] elevator switching race · bc1c1169
      Jens Axboe authored
      There's a race between shutting down one io scheduler and firing up the
      next, in which a new io could enter and cause the io scheduler to be
      invoked with bad or NULL data.
      
      To fix this, we need to maintain the queue lock for a bit longer.
      Unfortunately we cannot do that, since the elevator init requires to be
      run without the lock held.  This isn't easily fixable, without also
      changing the mempool API.  So split the initialization into two parts,
      and alloc-init operation and an attach operation.  Then we can
      preallocate the io scheduler and related structures, and run the attach
      inside the lock after we detach the old one.
      
      This patch has survived 30 minutes of 1 second io scheduler switching
      with a very busy io load.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      bc1c1169
  10. 18 Mar, 2006 3 commits
  11. 08 Feb, 2006 1 commit
  12. 09 Jan, 2006 2 commits
  13. 06 Jan, 2006 1 commit
  14. 28 Oct, 2005 3 commits
  15. 27 Jun, 2005 1 commit
    • Jens Axboe's avatar
      [PATCH] Update cfq io scheduler to time sliced design · 22e2c507
      Jens Axboe authored
      This updates the CFQ io scheduler to the new time sliced design (cfq
      v3).  It provides full process fairness, while giving excellent
      aggregate system throughput even for many competing processes.  It
      supports io priorities, either inherited from the cpu nice value or set
      directly with the ioprio_get/set syscalls.  The latter closely mimic
      set/getpriority.
      
      This import is based on my latest from -mm.
      Signed-off-by: default avatarJens Axboe <axboe@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      22e2c507
  16. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4