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Avoid extra swi_sched() call, if this SIM is already queued.

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It reduces overhead for coalesced command completions.
This commit is contained in:
Alexander Motin 2009-09-06 18:40:48 +00:00
parent 3b02c4a3d3
commit 788fb3767d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=196897
1 changed files with 16 additions and 12 deletions
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28
sys/cam/cam_xpt.c
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@ -4198,12 +4198,12 @@ xpt_done(union ccb *done_ccb)
mtx_lock(&cam_simq_lock);
TAILQ_INSERT_TAIL(&cam_simq, sim,
links);
sim->flags |= CAM_SIM_ON_DONEQ;
mtx_unlock(&cam_simq_lock);
sim->flags |= CAM_SIM_ON_DONEQ;
if ((done_ccb->ccb_h.path->periph->flags &
CAM_PERIPH_POLLED) == 0)
swi_sched(cambio_ih, 0);
}
if ((done_ccb->ccb_h.path->periph->flags &
CAM_PERIPH_POLLED) == 0)
swi_sched(cambio_ih, 0);
break;
default:
panic("unknown periph type %d",
@ -4889,16 +4889,20 @@ camisr(void *dummy)
mtx_lock(&cam_simq_lock);
TAILQ_INIT(&queue);
TAILQ_CONCAT(&queue, &cam_simq, links);
mtx_unlock(&cam_simq_lock);
while (!TAILQ_EMPTY(&cam_simq)) {
TAILQ_CONCAT(&queue, &cam_simq, links);
mtx_unlock(&cam_simq_lock);
while ((sim = TAILQ_FIRST(&queue)) != NULL) {
TAILQ_REMOVE(&queue, sim, links);
CAM_SIM_LOCK(sim);
sim->flags &= ~CAM_SIM_ON_DONEQ;
camisr_runqueue(&sim->sim_doneq);
CAM_SIM_UNLOCK(sim);
while ((sim = TAILQ_FIRST(&queue)) != NULL) {
TAILQ_REMOVE(&queue, sim, links);
CAM_SIM_LOCK(sim);
sim->flags &= ~CAM_SIM_ON_DONEQ;
camisr_runqueue(&sim->sim_doneq);
CAM_SIM_UNLOCK(sim);
}
mtx_lock(&cam_simq_lock);
}
mtx_unlock(&cam_simq_lock);
}
static void