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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-06-27 07:41:30 -0400 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 08:31:42 -0400 |
commit | 4be9daaa1b33701f011f4117f22dc1e45a3e6e34 (patch) | |
tree | 8c823cf397055c4919cc5f2a6275f125b0580a6b /include/asm-mn10300/bug.h | |
parent | 42a3ac7d5cee89849448b41b86faeb86f98e92f6 (diff) |
sched: fix task_h_load()
Currently task_h_load() computes the load of a task and uses that to either
subtract it from the total, or add to it.
However, removing or adding a task need not have any effect on the total load
at all. Imagine adding a task to a group that is local to one cpu - in that
case the total load of that cpu is unaffected.
So properly compute addition/removal:
s_i = S * rw_i / \Sum_j rw_j
s'_i = S * (rw_i + wl) / (\Sum_j rw_j + wg)
then s'_i - s_i gives the change in load.
Where s_i is the shares for cpu i, S the group weight, rw_i the runqueue weight
for that cpu, wl the weight we add (subtract) and wg the weight contribution to
the runqueue.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-mn10300/bug.h')
0 files changed, 0 insertions, 0 deletions