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| author | Peter Williams <pwil3058@bigpond.net.au> | 2007-10-24 18:23:51 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-24 18:23:51 +0200 |
| commit | e1d1484f72127a5580d37c379f6a5b2c2786434c (patch) | |
| tree | e3e6529c5b9079f35b2c60bbd346a3c51c2b2c13 /kernel/sched_idletask.c | |
| parent | sched: make cpu_shares_{show,store}() static (diff) | |
| download | linux-e1d1484f72127a5580d37c379f6a5b2c2786434c.tar.xz linux-e1d1484f72127a5580d37c379f6a5b2c2786434c.zip | |
sched: reduce balance-tasks overhead
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>
Diffstat (limited to 'kernel/sched_idletask.c')
| -rw-r--r-- | kernel/sched_idletask.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c index 6e2ead41516e..586b06ca30aa 100644 --- a/kernel/sched_idletask.c +++ b/kernel/sched_idletask.c @@ -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, |