1. 29 Sep, 2010 8 commits
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs · 4193d916
      Linus Torvalds authored
      * 'for-linus' of git://oss.sgi.com/xfs/xfs:
        xfs: force background CIL push under sustained load
      4193d916
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 · 9d457c60
      Linus Torvalds authored
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6:
        mfd: Fix max8925 irq control bit incorrect setting
        mfd: Ignore non-GPIO IRQs when setting wm831x IRQ types
      9d457c60
    • Daniel J Blueman's avatar
      fix OMAP2 MTD build failure · f12f662f
      Daniel J Blueman authored
      Fix build failure from recent interface change and merge.
      
      Tested on OMAP3430.
      Signed-off-by: default avatarDaniel J Blueman <daniel.blueman@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f12f662f
    • Dave Chinner's avatar
      xfs: force background CIL push under sustained load · 80168676
      Dave Chinner authored
      I have been seeing occasional pauses in transaction throughput up to
      30s long under heavy parallel workloads. The only notable thing was
      that the xfsaild was trying to be active during the pauses, but
      making no progress. It was running exactly 20 times a second (on the
      50ms no-progress backoff), and the number of pushbuf events was
      constant across this time as well.  IOWs, the xfsaild appeared to be
      stuck on buffers that it could not push out.
      
      Further investigation indicated that it was trying to push out inode
      buffers that were pinned and/or locked. The xfsbufd was also getting
      woken at the same frequency (by the xfsaild, no doubt) to push out
      delayed write buffers. The xfsbufd was not making any progress
      because all the buffers in the delwri queue were pinned. This scan-
      and-make-no-progress dance went one in the trace for some seconds,
      before the xfssyncd came along an issued a log force, and then
      things started going again.
      
      However, I noticed something strange about the log force - there
      were way too many IO's issued. 516 log buffers were written, to be
      exact. That added up to 129MB of log IO, which got me very
      interested because it's almost exactly 25% of the size of the log.
      He delayed logging code is suppose to aggregate the minimum of 25%
      of the log or 8MB worth of changes before flushing. That's what
      really puzzled me - why did a log force write 129MB instead of only
      8MB?
      
      Essentially what has happened is that no CIL pushes had occurred
      since the previous tail push which cleared out 25% of the log space.
      That caused all the new transactions to block because there wasn't
      log space for them, but they kick the xfsaild to push the tail.
      However, the xfsaild was not making progress because there were
      buffers it could not lock and flush, and the xfsbufd could not flush
      them because they were pinned. As a result, both the xfsaild and the
      xfsbufd could not move the tail of the log forward without the CIL
      first committing.
      
      The cause of the problem was that the background CIL push, which
      should happen when 8MB of aggregated changes have been committed, is
      being held off by the concurrent transaction commit load. The
      background push does a down_write_trylock() which will fail if there
      is a concurrent transaction commit holding the push lock in read
      mode. With 8 CPUs all doing transactions as fast as they can, there
      was enough concurrent transaction commits to hold off the background
      push until tail-pushing could no longer free log space, and the halt
      would occur.
      
      It should be noted that there is no reason why it would halt at 25%
      of log space used by a single CIL checkpoint. This bug could
      definitely violate the "no transaction should be larger than half
      the log" requirement and hence result in corruption if the system
      crashed under heavy load. This sort of bug is exactly the reason why
      delayed logging was tagged as experimental....
      
      The fix is to start blocking background pushes once the threshold
      has been exceeded. Rework the threshold calculations to keep the
      amount of log space a CIL checkpoint can use to below that of the
      AIL push threshold to avoid the problem completely.
      Signed-off-by: default avatarDave Chinner <dchinner@redhat.com>
      Reviewed-by: default avatarAlex Elder <aelder@sgi.com>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      80168676
    • Kevin Liu's avatar
      mfd: Fix max8925 irq control bit incorrect setting · 90182317
      Kevin Liu authored
      In max8925_irq_sync_unlock(), irq control bit is set at the same time.
      Zero means enabling irq, and one means disabling irq.
      
      The original code is:
      	irq_chg[0] &= irq_data->enable;
      
      It should be changed to:
      	irq_chg[0] &= ~irq_data->enable;
      
      Otherwise, irq control bit is mess.
      Signed-off-by: default avatarKevin Liu <kliu5@marvell.com>
      Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@marvell.com>
      Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
      90182317
    • Mark Brown's avatar
      mfd: Ignore non-GPIO IRQs when setting wm831x IRQ types · c9d66d35
      Mark Brown authored
      The driver was originally tested with an additional patch which
      made this unneeded but that patch had issuges and got lost on the
      way to mainline, causing problems when the errors are reported.
      Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
      Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
      Cc: stable@kernel.org
      c9d66d35
    • Linus Torvalds's avatar
      Linux 2.6.36-rc6 · 899611ee
      Linus Torvalds authored
      899611ee
    • David Howells's avatar
      MN10300: Handle missing sys_cacheflush() when caching disabled · 62bdb288
      David Howells authored
      When caching is disabled on the MN10300 arch, the sys_cacheflush()
      function is removed by conditional stuff in the makefiles, but is still
      referred to by the syscall table.
      
      Provide a null version that just returns 0 when caching is disabled (or
      -EINVAL if the arguments are silly).
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      62bdb288
  2. 28 Sep, 2010 9 commits
  3. 27 Sep, 2010 23 commits