diff options
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/sched.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c index 2fb0e63344c..9fb3133268f 100644 --- a/arch/powerpc/platforms/cell/spufs/sched.c +++ b/arch/powerpc/platforms/cell/spufs/sched.c @@ -292,12 +292,25 @@ static void spu_unbind_context(struct spu *spu, struct spu_context *ctx) */ static void __spu_add_to_rq(struct spu_context *ctx) { - int prio = ctx->prio; - - 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); + /* + * Unfortunately this code path can be called from multiple threads + * on behalf of a single context due to the way the problem state + * mmap support works. + * + * Fortunately we need to wake up all these threads at the same time + * and can simply skip the runqueue addition for every but the first + * thread getting into this codepath. + * + * It's still quite hacky, and long-term we should proxy all other + * threads through the owner thread so that spu_run is in control + * of all the scheduling activity for a given context. + */ + if (list_empty(&ctx->rq)) { + list_add_tail(&ctx->rq, &spu_prio->runq[ctx->prio]); + set_bit(ctx->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) @@ -440,12 +453,18 @@ int spu_activate(struct spu_context *ctx, unsigned long flags) { spuctx_switch_state(ctx, SPUCTX_UTIL_SYSTEM); - if (ctx->spu) - return 0; - do { struct spu *spu; + /* + * If there are multiple threads waiting for a single context + * only one actually binds the context while the others will + * only be able to acquire the state_mutex once the context + * already is in runnable state. + */ + if (ctx->spu) + return 0; + spu = spu_get_idle(ctx); /* * If this is a realtime thread we try to get it running by |