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  1. 11 9月, 2009 2 次提交
    • I
      sched: Fix sched::sched_stat_wait tracepoint field · e1f84508
      由 Ingo Molnar 提交于 
      This weird perf trace output:

  cc1-9943  [001]  2802.059479616: sched_stat_wait: task: as:9944 wait: 2801938766276 [ns]

Is caused by setting one component field of the delta to zero
a bit too early. Move it to later.

( Note, this does not affect the NEW_FAIR_SLEEPERS interactivity bug,
  it's just a reporting bug in essence. )
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nikos Chantziaras <realnc@arcor.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <4AA93D34.8040500@arcor.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      e1f84508
    • I
      sched: Disable NEW_FAIR_SLEEPERS for now · 3f2aa307
      由 Ingo Molnar 提交于 
      Nikos Chantziaras and Jens Axboe reported that turning off
NEW_FAIR_SLEEPERS improves desktop interactivity visibly.

Nikos described his experiences the following way:

  " With this setting, I can do "nice -n 19 make -j20" and
    still have a very smooth desktop and watch a movie at
    the same time.  Various other annoyances (like the
    "logout/shutdown/restart" dialog of KDE not appearing
    at all until the background fade-out effect has finished)
    are also gone.  So this seems to be the single most
    important setting that vastly improves desktop behavior,
    at least here. "

Jens described it the following way, referring to a 10-seconds
xmodmap scheduling delay he was trying to debug:

  " Then I tried switching NO_NEW_FAIR_SLEEPERS on, and then
    I get:

    Performance counter stats for 'xmodmap .xmodmap-carl':

         9.009137  task-clock-msecs         #      0.447 CPUs
               18  context-switches         #      0.002 M/sec
                1  CPU-migrations           #      0.000 M/sec
              315  page-faults              #      0.035 M/sec

    0.020167093  seconds time elapsed

    Woot! "

So disable it for now. In perf trace output i can see weird
delta timestamps:

  cc1-9943  [001]  2802.059479616: sched_stat_wait: task: as:9944 wait: 2801938766276 [ns]

That nsec field is not supposed to be that large. More digging
is needed - but lets turn it off while the real bug is found.
Reported-by: NNikos Chantziaras <realnc@arcor.de>
Tested-by: NNikos Chantziaras <realnc@arcor.de>
Reported-by: NJens Axboe <jens.axboe@oracle.com>
Tested-by: NJens Axboe <jens.axboe@oracle.com>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <4AA93D34.8040500@arcor.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3f2aa307
  3. 09 9月, 2009 3 次提交
  5. 08 9月, 2009 4 次提交
  7. 04 9月, 2009 13 次提交
  9. 02 9月, 2009 3 次提交
  11. 29 8月, 2009 1 次提交
  13. 28 8月, 2009 10 次提交
  15. 27 8月, 2009 4 次提交
    • T
      init: Move sched_clock_init after late_time_init · fa84e9ee
      由 Thomas Gleixner 提交于 
      Some architectures initialize clocks and timers in late_time_init and
x86 wants to do the same to avoid FIXMAP hackery for calibrating the
TSC. That would result in undefined sched_clock readout and wreckaged
printk timestamps again. We probably have those already on archs which
do all their time/clock setup in late_time_init.

There is no harm to move that after late_time_init except that a few
more boot timestamps are stale. The scheduler is not active at that
point so no real wreckage is expected.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Cc: linux-arch@vger.kernel.org
      fa84e9ee
    • E
      inotify: Ensure we alwasy write the terminating NULL. · 0db501bd
      由 Eric W. Biederman 提交于 
      Before the rewrite copy_event_to_user always wrote a terqminating '\0'
byte to user space after the filename.  Since the rewrite that
terminating byte was skipped if your filename is exactly a multiple of
event_size.  Ouch!

So add one byte to name_size before we round up and use clear_user to
set userspace to zero like /dev/zero does instead of copying the
strange nul_inotify_event.  I can't quite convince myself len_to_zero
will never exceed 16 and even if it doesn't clear_user should be more
efficient and a more accurate reflection of what the code is trying to
do.
Signed-off-by: NEric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: NEric Paris <eparis@redhat.com>
      0db501bd
    • E
      inotify: fix locking around inotify watching in the idr · dead537d
      由 Eric Paris 提交于 
      The are races around the idr storage of inotify watches.  It's possible
that a watch could be found from sys_inotify_rm_watch() in the idr, but it
could be removed from the idr before that code does it's removal.  Move the
locking and the refcnt'ing so that these have to happen atomically.
Signed-off-by: NEric Paris <eparis@redhat.com>
      dead537d
    • E
      inotify: do not BUG on idr entries at inotify destruction · cf437426
      由 Eric Paris 提交于 
      If an inotify watch is left in the idr when an fsnotify group is destroyed
this will lead to a BUG.  This is not a dangerous situation and really
indicates a programming bug and leak of memory.  This patch changes it to
use a WARN and a printk rather than killing people's boxes.
Signed-off-by: NEric Paris <eparis@redhat.com>
      cf437426