[PATCH] sched: add option to serialize load balancing

[PATCH] sched: add option to serialize load balancing

Large sched domains can be very expensive to scan.  Add an option SD_SERIALIZE
to the sched domain flags.  If that flag is set then we make sure that no
other such domain is being balanced.

[[email protected]: build fix]
Signed-off-by: Christoph Lameter <[email protected]>
Cc: Peter Williams <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: "Siddha, Suresh B" <[email protected]>
Cc: "Chen, Kenneth W" <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>