tree c3b4c8e563e1caf5e144310817fc1ecdf812ae41
parent efe567fc8281661524ffa75477a7c4ca9b466c63
author Suresh Siddha <suresh.b.siddha@intel.com> 1187875082 +0200
committer Ingo Molnar <mingo@elte.hu> 1187875082 +0200

sched: fix broken SMT/MC optimizations

On a four package system with HT - HT load balancing optimizations were
broken.  For example, if two tasks end up running on two logical threads
of one of the packages, scheduler is not able to pull one of the tasks
to a completely idle package.

In this scenario, for nice-0 tasks, imbalance calculated by scheduler
will be 512 and find_busiest_queue() will return 0 (as each cpu's load
is 1024 > imbalance and has only one task running).

Similarly MC scheduler optimizations also get fixed with this patch.

[ mingo@elte.hu: restored fair balancing by increasing the fuzz and
                 adding it back to the power decision, without the /2
                 factor. ]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>