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authorChristoph Hellwig <hch@lst.de>2007-06-29 10:58:05 +1000
committerPaul Mackerras <paulus@samba.org>2007-07-03 15:24:46 +1000
commitc77239b8be74f775142d9dd01041e2ce864ba20d (patch)
treefd93da1686df8b83a77ae839193f1eae4ce19a66 /arch/powerpc/platforms/cell/spufs/sched.c
parent08c9692b168240729cf89c69c4ad722760a5690c (diff)
[POWERPC] spusched: Disable tick when not needed
Only enable the scheduler tick if we have any context waiting to be scheduled. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/sched.c')
-rw-r--r--arch/powerpc/platforms/cell/spufs/sched.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index bb16c22360d5..2fb0e63344cc 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -294,9 +294,10 @@ static void __spu_add_to_rq(struct spu_context *ctx)
{
int prio = ctx->prio;
- spu_prio->nr_waiting++;
list_add_tail(&ctx->rq, &spu_prio->runq[prio]);
set_bit(prio, spu_prio->bitmap);
+ if (!spu_prio->nr_waiting++)
+ __mod_timer(&spusched_timer, jiffies + SPUSCHED_TICK);
}
static void __spu_del_from_rq(struct spu_context *ctx)
@@ -304,11 +305,13 @@ static void __spu_del_from_rq(struct spu_context *ctx)
int prio = ctx->prio;
if (!list_empty(&ctx->rq)) {
+ if (!--spu_prio->nr_waiting)
+ del_timer(&spusched_timer);
list_del_init(&ctx->rq);
- spu_prio->nr_waiting--;
+
+ if (list_empty(&spu_prio->runq[prio]))
+ clear_bit(prio, spu_prio->bitmap);
}
- if (list_empty(&spu_prio->runq[prio]))
- clear_bit(prio, spu_prio->bitmap);
}
static void spu_prio_wait(struct spu_context *ctx)
@@ -654,9 +657,6 @@ static int spusched_thread(void *unused)
struct spu *spu, *next;
int node;
- setup_timer(&spusched_timer, spusched_wake, 0);
- __mod_timer(&spusched_timer, jiffies + SPUSCHED_TICK);
-
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
schedule();
@@ -670,7 +670,6 @@ static int spusched_thread(void *unused)
}
}
- del_timer_sync(&spusched_timer);
return 0;
}
@@ -732,6 +731,8 @@ int __init spu_sched_init(void)
}
spin_lock_init(&spu_prio->runq_lock);
+ setup_timer(&spusched_timer, spusched_wake, 0);
+
spusched_task = kthread_run(spusched_thread, NULL, "spusched");
if (IS_ERR(spusched_task)) {
err = PTR_ERR(spusched_task);
@@ -762,6 +763,7 @@ void __exit spu_sched_exit(void)
remove_proc_entry("spu_loadavg", NULL);
+ del_timer_sync(&spusched_timer);
kthread_stop(spusched_task);
for (node = 0; node < MAX_NUMNODES; node++) {

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