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  1. 23 Feb, 2011 5 commits
    • Yong Zhang's avatar
      sched, autogroup, sysctl: Use proc_dointvec_minmax() instead · 1747b21f
      Yong Zhang authored 
      sched_autogroup_enabled has min/max value, proc_dointvec_minmax() is
be used for this case.
Signed-off-by: default avatarYong Zhang <yong.zhang0@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1298185696-4403-2-git-send-email-yong.zhang0@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      1747b21f
    • Peter Zijlstra's avatar
      sched: Fix the group_imb logic · 866ab43e
      Peter Zijlstra authored 
      On a 2*6*2 machine something like:

 taskset -c 3-11 bash -c 'for ((i=0;i<9;i++)) do while :; do :; done & done'

_should_ result in 9 busy CPUs, each running 1 task.

However it didn't quite work reliably, most of the time one cpu of the
second socket (6-11) would be idle and one cpu of the first socket
(0-5) would have two tasks on it.

The group_imb logic is supposed to deal with this and detect when a
particular group is imbalanced (like in our case, 0-2 are idle but 3-5
will have 4 tasks on it).

The detection phase needed a bit of a tweak as it was too weak and
required more than 2 avg weight tasks difference between idle and busy
cpus in the group which won't trigger for our test-case. So cure that
to be one or more avg task weight difference between cpus.

Once the detection phase worked, it was then defeated by the f_b_g()
tests trying to avoid ping-pongs. In particular, this_load >= max_load
triggered because the pulling cpu (the (first) idle cpu in on the
second socket, say 6) would find this_load to be 5 and max_load to be
4 (there'd be 5 tasks running on our socket and only 4 on the other
socket).
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nikhil Rao <ncrao@google.com>
Cc: Venkatesh Pallipadi <venki@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      866ab43e
    • Peter Zijlstra's avatar
      sched: Clean up some f_b_g() comments · cc57aa8f
      Peter Zijlstra authored 
      The existing comment tends to grow state (as it already has), split it
up and place it near the actual tests.
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nikhil Rao <ncrao@google.com>
Cc: Venkatesh Pallipadi <venki@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      cc57aa8f
    • Peter Zijlstra's avatar
      sched: Clean up remnants of sd_idle · c186fafe
      Peter Zijlstra authored 
      With the wholesale removal of the sd_idle SMT logic we can clean up
some more.
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nikhil Rao <ncrao@google.com>
Cc: Venkatesh Pallipadi <venki@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      c186fafe
    • Ingo Molnar's avatar
      Merge commit 'v2.6.38-rc6' into sched/core · d927dc93
      Ingo Molnar authored 
      Merge reason: Pick up the latest fixes before queueing up new changes.
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      d927dc93
  3. 22 Feb, 2011 2 commits
  5. 21 Feb, 2011 33 commits
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