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  1. 10 11月, 2007 14 次提交
    • I
      sched: clean up the wakeup preempt check · 77d9cc44
      由 Ingo Molnar 提交于 
      clean up the wakeup preemption check. No code changed:

   text    data     bss     dec     hex filename
  44227    3326      36   47589    b9e5 sched.o.before
  44227    3326      36   47589    b9e5 sched.o.after
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      77d9cc44
    • I
      sched: wakeup preemption fix · 8bc6767a
      由 Ingo Molnar 提交于 
      wakeup preemption fix: do not make it dependent on p->prio.
Preemption purely depends on ->vruntime.

This improves preemption in mixed-nice-level workloads.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8bc6767a
    • I
      sched: remove PREEMPT_RESTRICT · 3e3e13f3
      由 Ingo Molnar 提交于 
      remove PREEMPT_RESTRICT. (this is a separate commit so that any
regression related to the removal itself is bisectable)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3e3e13f3
    • I
      sched: turn off PREEMPT_RESTRICT · 52d3da1a
      由 Ingo Molnar 提交于 
      PREEMPT_RESTRICT was a method aimed at reducing the amount of wakeup
related preemption. It has a disadvantage though, it can prevent
legitimate wakeups if a task is 'unlucky' to be hit too early by a tick
that clears peer_preempt.

Now that the wakeup preemption has been cleaned up we dont seem to have
excessive preemptions anymore, so this feature can be turned off. (and
removed in the next patch)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      52d3da1a
    • I
      KVM: fix !SMP build error · a5fbb6d1
      由 Ingo Molnar 提交于 
      fix a !SMP build error:

drivers/kvm/kvm_main.c: In function 'kvm_flush_remote_tlbs':
drivers/kvm/kvm_main.c:220: error: implicit declaration of function 'smp_call_function_mask'

(and also avoid unused function warning related to up_smp_call_function()
not making use of the 'func' parameter.)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      a5fbb6d1
    • I
      x86: make nmi_cpu_busy() always defined · 0492007e
      由 Ingo Molnar 提交于 
      nmi_cpu_busy() must be available on !SMP too.

this is in preparation to a smp_call_function_mask() fix.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      0492007e
    • I
      x86: make ipi_handler() always defined · 4e2947f1
      由 Ingo Molnar 提交于 
      prepare for up_smp_call_function() to ensure that the 'func'
pointer is unused. (which is related to a KVM build fix)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      4e2947f1
    • E
      sched: cleanup, use NSEC_PER_MSEC and NSEC_PER_SEC · d6322faf
      由 Eric Dumazet 提交于 
      1) hardcoded 1000000000 value is used five times in places where
   NSEC_PER_SEC might be more readable.

2) A conversion from nsec to msec uses the hardcoded 1000000 value,
   which is a candidate for NSEC_PER_MSEC.

no code changed:

    text    data     bss     dec     hex filename
   44359    3326      36   47721    ba69 sched.o.before
   44359    3326      36   47721    ba69 sched.o.after
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      d6322faf
    • I
      sched: reintroduce SMP tunings again · 19978ca6
      由 Ingo Molnar 提交于 
      Yanmin Zhang reported an aim7 regression and bisected it down to:

 |  commit 38ad464d
 |  Author: Ingo Molnar <mingo@elte.hu>
 |  Date:   Mon Oct 15 17:00:02 2007 +0200
 |
 |     sched: uniform tunings
 |
 |     use the same defaults on both UP and SMP.

fix this by reintroducing similar SMP tunings again. This resolves
the regression.

(also update the comments to match the ilog2(nr_cpus) tuning effect)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      19978ca6
    • P
      sched: restore deterministic CPU accounting on powerpc · fa13a5a1
      由 Paul Mackerras 提交于 
      Since powerpc started using CONFIG_GENERIC_CLOCKEVENTS, the
deterministic CPU accounting (CONFIG_VIRT_CPU_ACCOUNTING) has been
broken on powerpc, because we end up counting user time twice: once in
timer_interrupt() and once in update_process_times().

This fixes the problem by pulling the code in update_process_times
that updates utime and stime into a separate function called
account_process_tick.  If CONFIG_VIRT_CPU_ACCOUNTING is not defined,
there is a version of account_process_tick in kernel/timer.c that
simply accounts a whole tick to either utime or stime as before.  If
CONFIG_VIRT_CPU_ACCOUNTING is defined, then arch code gets to
implement account_process_tick.

This also lets us simplify the s390 code a bit; it means that the s390
timer interrupt can now call update_process_times even when
CONFIG_VIRT_CPU_ACCOUNTING is turned on, and can just implement a
suitable account_process_tick().

account_process_tick() now takes the task_struct * as an argument.
Tested both with and without CONFIG_VIRT_CPU_ACCOUNTING.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      fa13a5a1
    • B
      sched: fix delay accounting regression · 9a41785c
      由 Balbir Singh 提交于 
      Fix the delay accounting regression introduced by commit
75d4ef16. rq no longer has sched_info
data associated with it. task_struct sched_info structure is used by delay
accounting to provide back statistics to user space.

also remove direct use of sched_clock() (which is not a valid thing to
do anymore) and use rq->clock instead.
Signed-off-by: NBalbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      9a41785c
    • P
      sched: reintroduce the sched_min_granularity tunable · b2be5e96
      由 Peter Zijlstra 提交于 
      we lost the sched_min_granularity tunable to a clever optimization
that uses the sched_latency/min_granularity ratio - but the ratio
is quite unintuitive to users and can also crash the kernel if the
ratio is set to 0. So reintroduce the min_granularity tunable,
while keeping the ratio maintained internally.

no functionality changed.

[ mingo@elte.hu: some fixlets. ]
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      b2be5e96
    • P
      sched: documentation: place_entity() comments · 2cb8600e
      由 Peter Zijlstra 提交于 
      Add a few comments to place_entity(). No code changed.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      2cb8600e
    • P
      sched: fix vslice · 10b77724
      由 Peter Zijlstra 提交于 
      vslice was missing a factor NICE_0_LOAD, as weight is in
weight*NICE_0_LOAD units.

the effect of this bug was larger initial slices and
thus latency-noisier forks.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      10b77724
  3. 07 11月, 2007 2 次提交
  5. 06 11月, 2007 24 次提交