1. 09 Nov, 2007 6 commits
    • Ingo Molnar's avatar
      sched: reintroduce SMP tunings again · 19978ca6
      Ingo Molnar authored
      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: default avatarIngo Molnar <mingo@elte.hu>
      19978ca6
    • Paul Mackerras's avatar
      sched: restore deterministic CPU accounting on powerpc · fa13a5a1
      Paul Mackerras authored
      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: default avatarPaul Mackerras <paulus@samba.org>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      fa13a5a1
    • Balbir Singh's avatar
      sched: fix delay accounting regression · 9a41785c
      Balbir Singh authored
      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: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      9a41785c
    • Peter Zijlstra's avatar
      sched: reintroduce the sched_min_granularity tunable · b2be5e96
      Peter Zijlstra authored
      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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      b2be5e96
    • Peter Zijlstra's avatar
      sched: documentation: place_entity() comments · 2cb8600e
      Peter Zijlstra authored
      Add a few comments to place_entity(). No code changed.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      2cb8600e
    • Peter Zijlstra's avatar
      sched: fix vslice · 10b77724
      Peter Zijlstra authored
      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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      10b77724
  2. 06 Nov, 2007 13 commits
  3. 05 Nov, 2007 21 commits