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sched: reduce balance-tasks overhead

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At the moment, balance_tasks() provides low level functionality for both
  move_tasks() and move_one_task() (indirectly) via the load_balance()
function (in the sched_class interface) which also provides dual
functionality.  This dual functionality complicates the interfaces and
internal mechanisms and makes the run time overhead of operations that
are called with two run queue locks held.

This patch addresses this issue and reduces the overhead of these
operations.

Signed-off-by: Peter Williams <pwil3058@bigpond.net.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Williams
2007-10-24 18:23:51 +02:00
committed by Ingo Molnar
parent a0f846aa76
commit e1d1484f72
5 changed files with 135 additions and 57 deletions
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14
kernel/sched_idletask.c
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@@ -39,9 +39,16 @@ static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
static unsigned long
load_balance_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
unsigned long max_nr_move, unsigned long max_load_move,
struct sched_domain *sd, enum cpu_idle_type idle,
int *all_pinned, int *this_best_prio)
unsigned long max_load_move,
struct sched_domain *sd, enum cpu_idle_type idle,
int *all_pinned, int *this_best_prio)
{
return 0;
}
static int
move_one_task_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
struct sched_domain *sd, enum cpu_idle_type idle)
{
return 0;
}
@@ -70,6 +77,7 @@ const struct sched_class idle_sched_class = {
.put_prev_task = put_prev_task_idle,
.load_balance = load_balance_idle,
.move_one_task = move_one_task_idle,
.set_curr_task = set_curr_task_idle,
.task_tick = task_tick_idle,