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  1. 26 Nov, 2009 2 commits
    • Ingo Molnar's avatar
      Merge branch 'sched/urgent' into sched/core · 16bc67ed
      Ingo Molnar authored 
      Merge reason: Pick up fixes that did not make it into .32.0
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      16bc67ed
    • Mike Travis's avatar
      sched: Limit the number of scheduler debug messages · f6630114
      Mike Travis authored 
      Remove the verbose scheduler debug messages unless kernel
parameter "sched_debug" set.  /proc/sched_debug unchanged.
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091118002221.489305000@alcatraz.americas.sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f6630114
  3. 25 Nov, 2009 1 commit
  5. 24 Nov, 2009 3 commits
    • Tim Blechmann's avatar
      sched, x86: Optimize branch hint in __switch_to() · a3a1de0c
      Tim Blechmann authored 
      Branch hint profiling on my nehalem machine showed 96%
incorrect branch hints:

  6548732 174664120  96 __switch_to                    process_64.c
    406
  6548745 174565593  96 __switch_to                    process_64.c
    410
Signed-off-by: default avatarTim Blechmann <tim@klingt.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0BBB93.3080307@klingt.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a3a1de0c
    • Tim Blechmann's avatar
      sched: Optimize branch hint in context_switch() · 710390d9
      Tim Blechmann authored 
      Branch hint profiling on my nehalem machine showed over 90%
incorrect branch hints:

  10420275 170645395  94 context_switch                 sched.c
   3043
  10408421 171098521  94 context_switch                 sched.c
   3050
Signed-off-by: default avatarTim Blechmann <tim@klingt.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0BBB9F.6080304@klingt.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      710390d9
    • Tim Blechmann's avatar
      sched: Optimize branch hint in pick_next_task_fair() · 36ace27e
      Tim Blechmann authored 
      Branch hint profiling on my nehalem machine showed 90%
incorrect branch hints:

  15728471 158903754  90 pick_next_task_fair
  sched_fair.c    1555
Signed-off-by: default avatarTim Blechmann <tim@klingt.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0BBBB1.2050100@klingt.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      36ace27e
  7. 23 Nov, 2009 1 commit
    • Jan Blunck's avatar
      sched_feat_write(): Update ppos instead of file->f_pos · 42994724
      Jan Blunck authored 
      sched_feat_write() should update ppos instead of file->f_pos.

(This reduces some BKL dependencies of this code.)
Signed-off-by: default avatarJan Blunck <jblunck@suse.de>
Cc: jkacur@redhat.com
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jamie Lokier <jamie@shareable.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
LKML-Reference: <1258735245-25826-8-git-send-email-jblunck@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      42994724
  9. 16 Nov, 2009 1 commit
  11. 15 Nov, 2009 1 commit
    • Tejun Heo's avatar
      sched, kvm: Fix race condition involving sched_in_preempt_notifers · 498657a4
      Tejun Heo authored 
      In finish_task_switch(), fire_sched_in_preempt_notifiers() is
called after finish_lock_switch().

However, depending on architecture, preemption can be enabled after
finish_lock_switch() which breaks the semantics of preempt
notifiers.

So move it before finish_arch_switch(). This also makes the in-
notifiers symmetric to out- notifiers in terms of locking - now
both are called under rq lock.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarAvi Kivity <avi@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4AFD2801.7020900@kernel.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      498657a4
  13. 13 Nov, 2009 2 commits
  15. 12 Nov, 2009 2 commits
    • Hidetoshi Seto's avatar
      sched: Fix granularity of task_u/stime() · 761b1d26
      Hidetoshi Seto authored 
      Originally task_s/utime() were designed to return clock_t but
later changed to return cputime_t by following commit:

  commit efe567fc
  Author: Christian Borntraeger <borntraeger@de.ibm.com>
  Date:   Thu Aug 23 15:18:02 2007 +0200

It only changed the type of return value, but not the
implementation. As the result the granularity of task_s/utime()
is still that of clock_t, not that of cputime_t.

So using task_s/utime() in __exit_signal() makes values
accumulated to the signal struct to be rounded and coarse
grained.

This patch removes casts to clock_t in task_u/stime(), to keep
granularity of cputime_t over the calculation.

v2:
  Use div_u64() to avoid error "undefined reference to `__udivdi3`"
  on some 32bit systems.
Signed-off-by: default avatarHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: xiyou.wangcong@gmail.com
Cc: Spencer Candland <spencer@bluehost.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
LKML-Reference: <4AFB9029.9000208@jp.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      761b1d26
    • Mike Galbraith's avatar
      sched: Fix/add missing update_rq_clock() calls · 055a0086
      Mike Galbraith authored 
      kthread_bind(), migrate_task() and sched_fork were missing
updates, and try_to_wake_up() was updating after having already
used the stale clock.

Aside from preventing potential latency hits, there' a side
benefit in that early boot printk time stamps become monotonic.
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1258020464.6491.2.camel@marge.simson.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
LKML-Reference: <new-submission>
      055a0086
  17. 11 Nov, 2009 27 commits
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