[POWERPC] spufs: optimize spu_run

There is no need to directly wake up contexts in spu_activate when
called from spu_run, so add a flag to surpress this wakeup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 6f8e2257c5a..07d0d095c62 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -247,8 +247,8 @@ static void spu_prio_wait(struct spu_context *ctx)
 {
         DEFINE_WAIT(wait);
 
+        set_bit(SPU_SCHED_WAKE, &ctx->sched_flags);
         prepare_to_wait_exclusive(&ctx->stop_wq, &wait, TASK_INTERRUPTIBLE);
-
         if (!signal_pending(current)) {
                 mutex_unlock(&ctx->state_mutex);
                 schedule();
@@ -256,6 +256,7 @@ static void spu_prio_wait(struct spu_context *ctx)
         }
         __set_current_state(TASK_RUNNING);
         remove_wait_queue(&ctx->stop_wq, &wait);
+        clear_bit(SPU_SCHED_WAKE, &ctx->sched_flags);
 }
 
 /**
@@ -275,7 +276,7 @@ static void spu_reschedule(struct spu *spu)
         best = sched_find_first_bit(spu_prio->bitmap);
         if (best < MAX_PRIO) {
                 struct spu_context *ctx = spu_grab_context(best);
-                if (ctx)
+                if (ctx && test_bit(SPU_SCHED_WAKE, &ctx->sched_flags))
                         wake_up(&ctx->stop_wq);
         }
         spin_unlock(&spu_prio->runq_lock);
@@ -315,7 +316,7 @@ static struct spu *spu_get_idle(struct spu_context *ctx)
  * add the context to the runqueue so it gets woken up once an spu
  * is available.
  */
-int spu_activate(struct spu_context *ctx, u64 flags)
+int spu_activate(struct spu_context *ctx, unsigned long flags)
 {
 
         if (ctx->spu)
@@ -331,7 +332,8 @@ int spu_activate(struct spu_context *ctx, u64 flags)
                 }
 
                 spu_add_to_rq(ctx);
-                spu_prio_wait(ctx);
+                if (!(flags & SPU_ACTIVATE_NOWAKE))
+                        spu_prio_wait(ctx);
                 spu_del_from_rq(ctx);
         } while (!signal_pending(current));