[POWERPC] spusched: Update scheduling paramters on every spu_run
Update scheduling information on every spu_run to allow for setting
threads to realtime priority just before running them. This requires
some slightly ugly code in spufs_run_spu because we can just update
the information unlocked if the spu is not runnable, but we need to
acquire the active_mutex when it is runnable to protect against
find_victim. This locking scheme requires opencoding
spu_acquire_runnable in spufs_run_spu which actually is a nice cleanup
all by itself.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index 002b40a..3707c7fd 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -96,6 +96,33 @@
ctx->time_slice = SCALE_PRIO(DEF_SPU_TIMESLICE, ctx->prio);
}
+/*
+ * Update scheduling information from the owning thread.
+ */
+void __spu_update_sched_info(struct spu_context *ctx)
+{
+ /*
+ * We do our own priority calculations, so we normally want
+ * ->static_prio to start with. Unfortunately thies field
+ * contains junk for threads with a realtime scheduling
+ * policy so we have to look at ->prio in this case.
+ */
+ if (rt_prio(current->prio))
+ ctx->prio = current->prio;
+ else
+ ctx->prio = current->static_prio;
+ ctx->policy = current->policy;
+}
+
+void spu_update_sched_info(struct spu_context *ctx)
+{
+ int node = ctx->spu->node;
+
+ mutex_lock(&spu_prio->active_mutex[node]);
+ __spu_update_sched_info(ctx);
+ mutex_unlock(&spu_prio->active_mutex[node]);
+}
+
static inline int node_allowed(int node)
{
cpumask_t mask;