bf925a1e49
Eliminate recursion from most thread_lock consumers. Return from sched_add() without the thread_lock held. This eliminates unnecessary atomics and lock word loads as well as reducing the hold time for scheduler locks. This will eventually allow for lockless remote adds. Discussed with: kib Reviewed by: jhb Tested by: pho Differential Revision: https://reviews.freebsd.org/D22626
1039 lines
26 KiB
C
1039 lines
26 KiB
C
/*-
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* Copyright (c) 2000 Doug Rabson
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* Copyright (c) 2014 Jeff Roberson
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* Copyright (c) 2016 Matthew Macy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cpuset.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/libkern.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/gtaskqueue.h>
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#include <sys/unistd.h>
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#include <machine/stdarg.h>
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static MALLOC_DEFINE(M_GTASKQUEUE, "gtaskqueue", "Group Task Queues");
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static void gtaskqueue_thread_enqueue(void *);
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static void gtaskqueue_thread_loop(void *arg);
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static int task_is_running(struct gtaskqueue *queue, struct gtask *gtask);
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static void gtaskqueue_drain_locked(struct gtaskqueue *queue, struct gtask *gtask);
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TASKQGROUP_DEFINE(softirq, mp_ncpus, 1);
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TASKQGROUP_DEFINE(config, 1, 1);
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struct gtaskqueue_busy {
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struct gtask *tb_running;
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u_int tb_seq;
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LIST_ENTRY(gtaskqueue_busy) tb_link;
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};
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typedef void (*gtaskqueue_enqueue_fn)(void *context);
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struct gtaskqueue {
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STAILQ_HEAD(, gtask) tq_queue;
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LIST_HEAD(, gtaskqueue_busy) tq_active;
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u_int tq_seq;
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int tq_callouts;
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struct mtx_padalign tq_mutex;
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gtaskqueue_enqueue_fn tq_enqueue;
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void *tq_context;
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char *tq_name;
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struct thread **tq_threads;
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int tq_tcount;
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int tq_spin;
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int tq_flags;
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taskqueue_callback_fn tq_callbacks[TASKQUEUE_NUM_CALLBACKS];
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void *tq_cb_contexts[TASKQUEUE_NUM_CALLBACKS];
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};
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#define TQ_FLAGS_ACTIVE (1 << 0)
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#define TQ_FLAGS_BLOCKED (1 << 1)
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#define TQ_FLAGS_UNLOCKED_ENQUEUE (1 << 2)
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#define DT_CALLOUT_ARMED (1 << 0)
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#define TQ_LOCK(tq) \
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do { \
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if ((tq)->tq_spin) \
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mtx_lock_spin(&(tq)->tq_mutex); \
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else \
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mtx_lock(&(tq)->tq_mutex); \
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} while (0)
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#define TQ_ASSERT_LOCKED(tq) mtx_assert(&(tq)->tq_mutex, MA_OWNED)
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#define TQ_UNLOCK(tq) \
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do { \
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if ((tq)->tq_spin) \
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mtx_unlock_spin(&(tq)->tq_mutex); \
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else \
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mtx_unlock(&(tq)->tq_mutex); \
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} while (0)
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#define TQ_ASSERT_UNLOCKED(tq) mtx_assert(&(tq)->tq_mutex, MA_NOTOWNED)
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#ifdef INVARIANTS
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static void
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gtask_dump(struct gtask *gtask)
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{
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printf("gtask: %p ta_flags=%x ta_priority=%d ta_func=%p ta_context=%p\n",
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gtask, gtask->ta_flags, gtask->ta_priority, gtask->ta_func, gtask->ta_context);
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}
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#endif
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static __inline int
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TQ_SLEEP(struct gtaskqueue *tq, void *p, const char *wm)
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{
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if (tq->tq_spin)
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return (msleep_spin(p, (struct mtx *)&tq->tq_mutex, wm, 0));
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return (msleep(p, &tq->tq_mutex, 0, wm, 0));
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}
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static struct gtaskqueue *
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_gtaskqueue_create(const char *name, int mflags,
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taskqueue_enqueue_fn enqueue, void *context,
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int mtxflags, const char *mtxname __unused)
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{
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struct gtaskqueue *queue;
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char *tq_name;
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tq_name = malloc(TASKQUEUE_NAMELEN, M_GTASKQUEUE, mflags | M_ZERO);
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if (!tq_name)
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return (NULL);
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snprintf(tq_name, TASKQUEUE_NAMELEN, "%s", (name) ? name : "taskqueue");
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queue = malloc(sizeof(struct gtaskqueue), M_GTASKQUEUE, mflags | M_ZERO);
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if (!queue) {
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free(tq_name, M_GTASKQUEUE);
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return (NULL);
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}
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STAILQ_INIT(&queue->tq_queue);
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LIST_INIT(&queue->tq_active);
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queue->tq_enqueue = enqueue;
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queue->tq_context = context;
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queue->tq_name = tq_name;
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queue->tq_spin = (mtxflags & MTX_SPIN) != 0;
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queue->tq_flags |= TQ_FLAGS_ACTIVE;
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if (enqueue == gtaskqueue_thread_enqueue)
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queue->tq_flags |= TQ_FLAGS_UNLOCKED_ENQUEUE;
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mtx_init(&queue->tq_mutex, tq_name, NULL, mtxflags);
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return (queue);
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}
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/*
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* Signal a taskqueue thread to terminate.
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*/
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static void
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gtaskqueue_terminate(struct thread **pp, struct gtaskqueue *tq)
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{
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while (tq->tq_tcount > 0 || tq->tq_callouts > 0) {
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wakeup(tq);
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TQ_SLEEP(tq, pp, "gtq_destroy");
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}
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}
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static void
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gtaskqueue_free(struct gtaskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags &= ~TQ_FLAGS_ACTIVE;
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gtaskqueue_terminate(queue->tq_threads, queue);
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KASSERT(LIST_EMPTY(&queue->tq_active), ("Tasks still running?"));
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KASSERT(queue->tq_callouts == 0, ("Armed timeout tasks"));
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mtx_destroy(&queue->tq_mutex);
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free(queue->tq_threads, M_GTASKQUEUE);
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free(queue->tq_name, M_GTASKQUEUE);
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free(queue, M_GTASKQUEUE);
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}
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/*
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* Wait for all to complete, then prevent it from being enqueued
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*/
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void
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grouptask_block(struct grouptask *grouptask)
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{
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struct gtaskqueue *queue = grouptask->gt_taskqueue;
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struct gtask *gtask = &grouptask->gt_task;
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#ifdef INVARIANTS
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if (queue == NULL) {
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gtask_dump(gtask);
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panic("queue == NULL");
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}
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#endif
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TQ_LOCK(queue);
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gtask->ta_flags |= TASK_NOENQUEUE;
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gtaskqueue_drain_locked(queue, gtask);
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TQ_UNLOCK(queue);
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}
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void
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grouptask_unblock(struct grouptask *grouptask)
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{
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struct gtaskqueue *queue = grouptask->gt_taskqueue;
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struct gtask *gtask = &grouptask->gt_task;
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#ifdef INVARIANTS
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if (queue == NULL) {
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gtask_dump(gtask);
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panic("queue == NULL");
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}
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#endif
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TQ_LOCK(queue);
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gtask->ta_flags &= ~TASK_NOENQUEUE;
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TQ_UNLOCK(queue);
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}
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int
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grouptaskqueue_enqueue(struct gtaskqueue *queue, struct gtask *gtask)
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{
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#ifdef INVARIANTS
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if (queue == NULL) {
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gtask_dump(gtask);
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panic("queue == NULL");
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}
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#endif
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TQ_LOCK(queue);
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if (gtask->ta_flags & TASK_ENQUEUED) {
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TQ_UNLOCK(queue);
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return (0);
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}
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if (gtask->ta_flags & TASK_NOENQUEUE) {
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TQ_UNLOCK(queue);
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return (EAGAIN);
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}
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STAILQ_INSERT_TAIL(&queue->tq_queue, gtask, ta_link);
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gtask->ta_flags |= TASK_ENQUEUED;
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TQ_UNLOCK(queue);
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if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
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queue->tq_enqueue(queue->tq_context);
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return (0);
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}
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static void
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gtaskqueue_task_nop_fn(void *context)
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{
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}
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/*
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* Block until all currently queued tasks in this taskqueue
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* have begun execution. Tasks queued during execution of
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* this function are ignored.
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*/
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static void
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gtaskqueue_drain_tq_queue(struct gtaskqueue *queue)
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{
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struct gtask t_barrier;
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if (STAILQ_EMPTY(&queue->tq_queue))
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return;
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/*
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* Enqueue our barrier after all current tasks, but with
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* the highest priority so that newly queued tasks cannot
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* pass it. Because of the high priority, we can not use
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* taskqueue_enqueue_locked directly (which drops the lock
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* anyway) so just insert it at tail while we have the
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* queue lock.
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*/
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GTASK_INIT(&t_barrier, 0, USHRT_MAX, gtaskqueue_task_nop_fn, &t_barrier);
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STAILQ_INSERT_TAIL(&queue->tq_queue, &t_barrier, ta_link);
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t_barrier.ta_flags |= TASK_ENQUEUED;
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/*
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* Once the barrier has executed, all previously queued tasks
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* have completed or are currently executing.
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*/
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while (t_barrier.ta_flags & TASK_ENQUEUED)
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TQ_SLEEP(queue, &t_barrier, "gtq_qdrain");
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}
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/*
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* Block until all currently executing tasks for this taskqueue
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* complete. Tasks that begin execution during the execution
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* of this function are ignored.
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*/
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static void
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gtaskqueue_drain_tq_active(struct gtaskqueue *queue)
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{
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struct gtaskqueue_busy *tb;
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u_int seq;
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if (LIST_EMPTY(&queue->tq_active))
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return;
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/* Block taskq_terminate().*/
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queue->tq_callouts++;
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/* Wait for any active task with sequence from the past. */
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seq = queue->tq_seq;
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restart:
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LIST_FOREACH(tb, &queue->tq_active, tb_link) {
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if ((int)(tb->tb_seq - seq) <= 0) {
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TQ_SLEEP(queue, tb->tb_running, "gtq_adrain");
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goto restart;
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}
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}
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/* Release taskqueue_terminate(). */
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queue->tq_callouts--;
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if ((queue->tq_flags & TQ_FLAGS_ACTIVE) == 0)
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wakeup_one(queue->tq_threads);
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}
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void
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gtaskqueue_block(struct gtaskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags |= TQ_FLAGS_BLOCKED;
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TQ_UNLOCK(queue);
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}
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void
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gtaskqueue_unblock(struct gtaskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags &= ~TQ_FLAGS_BLOCKED;
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if (!STAILQ_EMPTY(&queue->tq_queue))
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queue->tq_enqueue(queue->tq_context);
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TQ_UNLOCK(queue);
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}
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static void
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gtaskqueue_run_locked(struct gtaskqueue *queue)
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{
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struct gtaskqueue_busy tb;
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struct gtask *gtask;
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KASSERT(queue != NULL, ("tq is NULL"));
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TQ_ASSERT_LOCKED(queue);
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tb.tb_running = NULL;
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LIST_INSERT_HEAD(&queue->tq_active, &tb, tb_link);
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while ((gtask = STAILQ_FIRST(&queue->tq_queue)) != NULL) {
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STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
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gtask->ta_flags &= ~TASK_ENQUEUED;
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tb.tb_running = gtask;
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tb.tb_seq = ++queue->tq_seq;
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TQ_UNLOCK(queue);
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KASSERT(gtask->ta_func != NULL, ("task->ta_func is NULL"));
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gtask->ta_func(gtask->ta_context);
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TQ_LOCK(queue);
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wakeup(gtask);
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}
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LIST_REMOVE(&tb, tb_link);
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}
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static int
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task_is_running(struct gtaskqueue *queue, struct gtask *gtask)
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{
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struct gtaskqueue_busy *tb;
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TQ_ASSERT_LOCKED(queue);
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LIST_FOREACH(tb, &queue->tq_active, tb_link) {
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if (tb->tb_running == gtask)
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return (1);
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}
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return (0);
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}
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|
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static int
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gtaskqueue_cancel_locked(struct gtaskqueue *queue, struct gtask *gtask)
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{
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|
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if (gtask->ta_flags & TASK_ENQUEUED)
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STAILQ_REMOVE(&queue->tq_queue, gtask, gtask, ta_link);
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gtask->ta_flags &= ~TASK_ENQUEUED;
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return (task_is_running(queue, gtask) ? EBUSY : 0);
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}
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|
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int
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gtaskqueue_cancel(struct gtaskqueue *queue, struct gtask *gtask)
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{
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int error;
|
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TQ_LOCK(queue);
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error = gtaskqueue_cancel_locked(queue, gtask);
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TQ_UNLOCK(queue);
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return (error);
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}
|
|
|
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static void
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gtaskqueue_drain_locked(struct gtaskqueue *queue, struct gtask *gtask)
|
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{
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while ((gtask->ta_flags & TASK_ENQUEUED) || task_is_running(queue, gtask))
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TQ_SLEEP(queue, gtask, "gtq_drain");
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}
|
|
|
|
void
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|
gtaskqueue_drain(struct gtaskqueue *queue, struct gtask *gtask)
|
|
{
|
|
|
|
if (!queue->tq_spin)
|
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
|
|
|
|
TQ_LOCK(queue);
|
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gtaskqueue_drain_locked(queue, gtask);
|
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TQ_UNLOCK(queue);
|
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}
|
|
|
|
void
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|
gtaskqueue_drain_all(struct gtaskqueue *queue)
|
|
{
|
|
|
|
if (!queue->tq_spin)
|
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
|
|
|
|
TQ_LOCK(queue);
|
|
gtaskqueue_drain_tq_queue(queue);
|
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gtaskqueue_drain_tq_active(queue);
|
|
TQ_UNLOCK(queue);
|
|
}
|
|
|
|
static int
|
|
_gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
|
|
cpuset_t *mask, const char *name, va_list ap)
|
|
{
|
|
char ktname[MAXCOMLEN + 1];
|
|
struct thread *td;
|
|
struct gtaskqueue *tq;
|
|
int i, error;
|
|
|
|
if (count <= 0)
|
|
return (EINVAL);
|
|
|
|
vsnprintf(ktname, sizeof(ktname), name, ap);
|
|
tq = *tqp;
|
|
|
|
tq->tq_threads = malloc(sizeof(struct thread *) * count, M_GTASKQUEUE,
|
|
M_NOWAIT | M_ZERO);
|
|
if (tq->tq_threads == NULL) {
|
|
printf("%s: no memory for %s threads\n", __func__, ktname);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (count == 1)
|
|
error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
|
|
&tq->tq_threads[i], RFSTOPPED, 0, "%s", ktname);
|
|
else
|
|
error = kthread_add(gtaskqueue_thread_loop, tqp, NULL,
|
|
&tq->tq_threads[i], RFSTOPPED, 0,
|
|
"%s_%d", ktname, i);
|
|
if (error) {
|
|
/* should be ok to continue, taskqueue_free will dtrt */
|
|
printf("%s: kthread_add(%s): error %d", __func__,
|
|
ktname, error);
|
|
tq->tq_threads[i] = NULL; /* paranoid */
|
|
} else
|
|
tq->tq_tcount++;
|
|
}
|
|
for (i = 0; i < count; i++) {
|
|
if (tq->tq_threads[i] == NULL)
|
|
continue;
|
|
td = tq->tq_threads[i];
|
|
if (mask) {
|
|
error = cpuset_setthread(td->td_tid, mask);
|
|
/*
|
|
* Failing to pin is rarely an actual fatal error;
|
|
* it'll just affect performance.
|
|
*/
|
|
if (error)
|
|
printf("%s: curthread=%llu: can't pin; "
|
|
"error=%d\n",
|
|
__func__,
|
|
(unsigned long long) td->td_tid,
|
|
error);
|
|
}
|
|
thread_lock(td);
|
|
sched_prio(td, pri);
|
|
sched_add(td, SRQ_BORING);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
gtaskqueue_start_threads(struct gtaskqueue **tqp, int count, int pri,
|
|
const char *name, ...)
|
|
{
|
|
va_list ap;
|
|
int error;
|
|
|
|
va_start(ap, name);
|
|
error = _gtaskqueue_start_threads(tqp, count, pri, NULL, name, ap);
|
|
va_end(ap);
|
|
return (error);
|
|
}
|
|
|
|
static inline void
|
|
gtaskqueue_run_callback(struct gtaskqueue *tq,
|
|
enum taskqueue_callback_type cb_type)
|
|
{
|
|
taskqueue_callback_fn tq_callback;
|
|
|
|
TQ_ASSERT_UNLOCKED(tq);
|
|
tq_callback = tq->tq_callbacks[cb_type];
|
|
if (tq_callback != NULL)
|
|
tq_callback(tq->tq_cb_contexts[cb_type]);
|
|
}
|
|
|
|
static void
|
|
gtaskqueue_thread_loop(void *arg)
|
|
{
|
|
struct gtaskqueue **tqp, *tq;
|
|
|
|
tqp = arg;
|
|
tq = *tqp;
|
|
gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_INIT);
|
|
TQ_LOCK(tq);
|
|
while ((tq->tq_flags & TQ_FLAGS_ACTIVE) != 0) {
|
|
/* XXX ? */
|
|
gtaskqueue_run_locked(tq);
|
|
/*
|
|
* Because taskqueue_run() can drop tq_mutex, we need to
|
|
* check if the TQ_FLAGS_ACTIVE flag wasn't removed in the
|
|
* meantime, which means we missed a wakeup.
|
|
*/
|
|
if ((tq->tq_flags & TQ_FLAGS_ACTIVE) == 0)
|
|
break;
|
|
TQ_SLEEP(tq, tq, "-");
|
|
}
|
|
gtaskqueue_run_locked(tq);
|
|
/*
|
|
* This thread is on its way out, so just drop the lock temporarily
|
|
* in order to call the shutdown callback. This allows the callback
|
|
* to look at the taskqueue, even just before it dies.
|
|
*/
|
|
TQ_UNLOCK(tq);
|
|
gtaskqueue_run_callback(tq, TASKQUEUE_CALLBACK_TYPE_SHUTDOWN);
|
|
TQ_LOCK(tq);
|
|
|
|
/* rendezvous with thread that asked us to terminate */
|
|
tq->tq_tcount--;
|
|
wakeup_one(tq->tq_threads);
|
|
TQ_UNLOCK(tq);
|
|
kthread_exit();
|
|
}
|
|
|
|
static void
|
|
gtaskqueue_thread_enqueue(void *context)
|
|
{
|
|
struct gtaskqueue **tqp, *tq;
|
|
|
|
tqp = context;
|
|
tq = *tqp;
|
|
wakeup_any(tq);
|
|
}
|
|
|
|
|
|
static struct gtaskqueue *
|
|
gtaskqueue_create_fast(const char *name, int mflags,
|
|
taskqueue_enqueue_fn enqueue, void *context)
|
|
{
|
|
return _gtaskqueue_create(name, mflags, enqueue, context,
|
|
MTX_SPIN, "fast_taskqueue");
|
|
}
|
|
|
|
|
|
struct taskqgroup_cpu {
|
|
LIST_HEAD(, grouptask) tgc_tasks;
|
|
struct gtaskqueue *tgc_taskq;
|
|
int tgc_cnt;
|
|
int tgc_cpu;
|
|
};
|
|
|
|
struct taskqgroup {
|
|
struct taskqgroup_cpu tqg_queue[MAXCPU];
|
|
struct mtx tqg_lock;
|
|
const char * tqg_name;
|
|
int tqg_adjusting;
|
|
int tqg_stride;
|
|
int tqg_cnt;
|
|
};
|
|
|
|
struct taskq_bind_task {
|
|
struct gtask bt_task;
|
|
int bt_cpuid;
|
|
};
|
|
|
|
static void
|
|
taskqgroup_cpu_create(struct taskqgroup *qgroup, int idx, int cpu)
|
|
{
|
|
struct taskqgroup_cpu *qcpu;
|
|
|
|
qcpu = &qgroup->tqg_queue[idx];
|
|
LIST_INIT(&qcpu->tgc_tasks);
|
|
qcpu->tgc_taskq = gtaskqueue_create_fast(NULL, M_WAITOK,
|
|
taskqueue_thread_enqueue, &qcpu->tgc_taskq);
|
|
gtaskqueue_start_threads(&qcpu->tgc_taskq, 1, PI_SOFT,
|
|
"%s_%d", qgroup->tqg_name, idx);
|
|
qcpu->tgc_cpu = cpu;
|
|
}
|
|
|
|
static void
|
|
taskqgroup_cpu_remove(struct taskqgroup *qgroup, int idx)
|
|
{
|
|
|
|
gtaskqueue_free(qgroup->tqg_queue[idx].tgc_taskq);
|
|
}
|
|
|
|
/*
|
|
* Find the taskq with least # of tasks that doesn't currently have any
|
|
* other queues from the uniq identifier.
|
|
*/
|
|
static int
|
|
taskqgroup_find(struct taskqgroup *qgroup, void *uniq)
|
|
{
|
|
struct grouptask *n;
|
|
int i, idx, mincnt;
|
|
int strict;
|
|
|
|
mtx_assert(&qgroup->tqg_lock, MA_OWNED);
|
|
if (qgroup->tqg_cnt == 0)
|
|
return (0);
|
|
idx = -1;
|
|
mincnt = INT_MAX;
|
|
/*
|
|
* Two passes; First scan for a queue with the least tasks that
|
|
* does not already service this uniq id. If that fails simply find
|
|
* the queue with the least total tasks;
|
|
*/
|
|
for (strict = 1; mincnt == INT_MAX; strict = 0) {
|
|
for (i = 0; i < qgroup->tqg_cnt; i++) {
|
|
if (qgroup->tqg_queue[i].tgc_cnt > mincnt)
|
|
continue;
|
|
if (strict) {
|
|
LIST_FOREACH(n,
|
|
&qgroup->tqg_queue[i].tgc_tasks, gt_list)
|
|
if (n->gt_uniq == uniq)
|
|
break;
|
|
if (n != NULL)
|
|
continue;
|
|
}
|
|
mincnt = qgroup->tqg_queue[i].tgc_cnt;
|
|
idx = i;
|
|
}
|
|
}
|
|
if (idx == -1)
|
|
panic("%s: failed to pick a qid.", __func__);
|
|
|
|
return (idx);
|
|
}
|
|
|
|
/*
|
|
* smp_started is unusable since it is not set for UP kernels or even for
|
|
* SMP kernels when there is 1 CPU. This is usually handled by adding a
|
|
* (mp_ncpus == 1) test, but that would be broken here since we need to
|
|
* to synchronize with the SI_SUB_SMP ordering. Even in the pure SMP case
|
|
* smp_started only gives a fuzzy ordering relative to SI_SUB_SMP.
|
|
*
|
|
* So maintain our own flag. It must be set after all CPUs are started
|
|
* and before SI_SUB_SMP:SI_ORDER_ANY so that the SYSINIT for delayed
|
|
* adjustment is properly delayed. SI_ORDER_FOURTH is clearly before
|
|
* SI_ORDER_ANY and unclearly after the CPUs are started. It would be
|
|
* simpler for adjustment to pass a flag indicating if it is delayed.
|
|
*/
|
|
|
|
static int tqg_smp_started;
|
|
|
|
static void
|
|
tqg_record_smp_started(void *arg)
|
|
{
|
|
tqg_smp_started = 1;
|
|
}
|
|
|
|
SYSINIT(tqg_record_smp_started, SI_SUB_SMP, SI_ORDER_FOURTH,
|
|
tqg_record_smp_started, NULL);
|
|
|
|
void
|
|
taskqgroup_attach(struct taskqgroup *qgroup, struct grouptask *gtask,
|
|
void *uniq, device_t dev, struct resource *irq, const char *name)
|
|
{
|
|
int cpu, qid, error;
|
|
|
|
gtask->gt_uniq = uniq;
|
|
snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
|
|
gtask->gt_dev = dev;
|
|
gtask->gt_irq = irq;
|
|
gtask->gt_cpu = -1;
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
qid = taskqgroup_find(qgroup, uniq);
|
|
qgroup->tqg_queue[qid].tgc_cnt++;
|
|
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
|
|
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
|
|
if (dev != NULL && irq != NULL && tqg_smp_started) {
|
|
cpu = qgroup->tqg_queue[qid].tgc_cpu;
|
|
gtask->gt_cpu = cpu;
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
error = bus_bind_intr(dev, irq, cpu);
|
|
if (error)
|
|
printf("%s: binding interrupt failed for %s: %d\n",
|
|
__func__, gtask->gt_name, error);
|
|
} else
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
}
|
|
|
|
static void
|
|
taskqgroup_attach_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
|
|
{
|
|
int qid, cpu, error;
|
|
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
qid = taskqgroup_find(qgroup, gtask->gt_uniq);
|
|
cpu = qgroup->tqg_queue[qid].tgc_cpu;
|
|
if (gtask->gt_dev != NULL && gtask->gt_irq != NULL) {
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
error = bus_bind_intr(gtask->gt_dev, gtask->gt_irq, cpu);
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
if (error)
|
|
printf("%s: binding interrupt failed for %s: %d\n",
|
|
__func__, gtask->gt_name, error);
|
|
|
|
}
|
|
qgroup->tqg_queue[qid].tgc_cnt++;
|
|
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
|
|
MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
|
|
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
}
|
|
|
|
int
|
|
taskqgroup_attach_cpu(struct taskqgroup *qgroup, struct grouptask *gtask,
|
|
void *uniq, int cpu, device_t dev, struct resource *irq, const char *name)
|
|
{
|
|
int i, qid, error;
|
|
|
|
qid = -1;
|
|
gtask->gt_uniq = uniq;
|
|
snprintf(gtask->gt_name, GROUPTASK_NAMELEN, "%s", name ? name : "grouptask");
|
|
gtask->gt_dev = dev;
|
|
gtask->gt_irq = irq;
|
|
gtask->gt_cpu = cpu;
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
if (tqg_smp_started) {
|
|
for (i = 0; i < qgroup->tqg_cnt; i++)
|
|
if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
|
|
qid = i;
|
|
break;
|
|
}
|
|
if (qid == -1) {
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
|
|
return (EINVAL);
|
|
}
|
|
} else
|
|
qid = 0;
|
|
qgroup->tqg_queue[qid].tgc_cnt++;
|
|
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
|
|
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
|
|
cpu = qgroup->tqg_queue[qid].tgc_cpu;
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
|
|
if (dev != NULL && irq != NULL && tqg_smp_started) {
|
|
error = bus_bind_intr(dev, irq, cpu);
|
|
if (error)
|
|
printf("%s: binding interrupt failed for %s: %d\n",
|
|
__func__, gtask->gt_name, error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
taskqgroup_attach_cpu_deferred(struct taskqgroup *qgroup, struct grouptask *gtask)
|
|
{
|
|
device_t dev;
|
|
struct resource *irq;
|
|
int cpu, error, i, qid;
|
|
|
|
qid = -1;
|
|
dev = gtask->gt_dev;
|
|
irq = gtask->gt_irq;
|
|
cpu = gtask->gt_cpu;
|
|
MPASS(tqg_smp_started);
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
for (i = 0; i < qgroup->tqg_cnt; i++)
|
|
if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
|
|
qid = i;
|
|
break;
|
|
}
|
|
if (qid == -1) {
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
printf("%s: qid not found for %s cpu=%d\n", __func__, gtask->gt_name, cpu);
|
|
return (EINVAL);
|
|
}
|
|
qgroup->tqg_queue[qid].tgc_cnt++;
|
|
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
|
|
MPASS(qgroup->tqg_queue[qid].tgc_taskq != NULL);
|
|
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
|
|
if (dev != NULL && irq != NULL) {
|
|
error = bus_bind_intr(dev, irq, cpu);
|
|
if (error)
|
|
printf("%s: binding interrupt failed for %s: %d\n",
|
|
__func__, gtask->gt_name, error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
taskqgroup_detach(struct taskqgroup *qgroup, struct grouptask *gtask)
|
|
{
|
|
int i;
|
|
|
|
grouptask_block(gtask);
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
for (i = 0; i < qgroup->tqg_cnt; i++)
|
|
if (qgroup->tqg_queue[i].tgc_taskq == gtask->gt_taskqueue)
|
|
break;
|
|
if (i == qgroup->tqg_cnt)
|
|
panic("%s: task %s not in group", __func__, gtask->gt_name);
|
|
qgroup->tqg_queue[i].tgc_cnt--;
|
|
LIST_REMOVE(gtask, gt_list);
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
gtask->gt_taskqueue = NULL;
|
|
gtask->gt_task.ta_flags &= ~TASK_NOENQUEUE;
|
|
}
|
|
|
|
static void
|
|
taskqgroup_binder(void *ctx)
|
|
{
|
|
struct taskq_bind_task *gtask = (struct taskq_bind_task *)ctx;
|
|
cpuset_t mask;
|
|
int error;
|
|
|
|
CPU_ZERO(&mask);
|
|
CPU_SET(gtask->bt_cpuid, &mask);
|
|
error = cpuset_setthread(curthread->td_tid, &mask);
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, gtask->bt_cpuid);
|
|
thread_unlock(curthread);
|
|
|
|
if (error)
|
|
printf("%s: binding curthread failed: %d\n", __func__, error);
|
|
free(gtask, M_DEVBUF);
|
|
}
|
|
|
|
static void
|
|
taskqgroup_bind(struct taskqgroup *qgroup)
|
|
{
|
|
struct taskq_bind_task *gtask;
|
|
int i;
|
|
|
|
/*
|
|
* Bind taskqueue threads to specific CPUs, if they have been assigned
|
|
* one.
|
|
*/
|
|
if (qgroup->tqg_cnt == 1)
|
|
return;
|
|
|
|
for (i = 0; i < qgroup->tqg_cnt; i++) {
|
|
gtask = malloc(sizeof (*gtask), M_DEVBUF, M_WAITOK);
|
|
GTASK_INIT(>ask->bt_task, 0, 0, taskqgroup_binder, gtask);
|
|
gtask->bt_cpuid = qgroup->tqg_queue[i].tgc_cpu;
|
|
grouptaskqueue_enqueue(qgroup->tqg_queue[i].tgc_taskq,
|
|
>ask->bt_task);
|
|
}
|
|
}
|
|
|
|
static void
|
|
taskqgroup_config_init(void *arg)
|
|
{
|
|
struct taskqgroup *qgroup = qgroup_config;
|
|
LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
|
|
|
|
LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
|
|
grouptask, gt_list);
|
|
qgroup->tqg_queue[0].tgc_cnt = 0;
|
|
taskqgroup_cpu_create(qgroup, 0, 0);
|
|
|
|
qgroup->tqg_cnt = 1;
|
|
qgroup->tqg_stride = 1;
|
|
}
|
|
|
|
SYSINIT(taskqgroup_config_init, SI_SUB_TASKQ, SI_ORDER_SECOND,
|
|
taskqgroup_config_init, NULL);
|
|
|
|
static int
|
|
_taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
|
|
{
|
|
LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
|
|
struct grouptask *gtask;
|
|
int i, k, old_cnt, old_cpu, cpu;
|
|
|
|
mtx_assert(&qgroup->tqg_lock, MA_OWNED);
|
|
|
|
if (cnt < 1 || cnt * stride > mp_ncpus || !tqg_smp_started) {
|
|
printf("%s: failed cnt: %d stride: %d "
|
|
"mp_ncpus: %d tqg_smp_started: %d\n",
|
|
__func__, cnt, stride, mp_ncpus, tqg_smp_started);
|
|
return (EINVAL);
|
|
}
|
|
if (qgroup->tqg_adjusting) {
|
|
printf("%s failed: adjusting\n", __func__);
|
|
return (EBUSY);
|
|
}
|
|
qgroup->tqg_adjusting = 1;
|
|
old_cnt = qgroup->tqg_cnt;
|
|
old_cpu = 0;
|
|
if (old_cnt < cnt)
|
|
old_cpu = qgroup->tqg_queue[old_cnt].tgc_cpu;
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
/*
|
|
* Set up queue for tasks added before boot.
|
|
*/
|
|
if (old_cnt == 0) {
|
|
LIST_SWAP(>ask_head, &qgroup->tqg_queue[0].tgc_tasks,
|
|
grouptask, gt_list);
|
|
qgroup->tqg_queue[0].tgc_cnt = 0;
|
|
}
|
|
|
|
/*
|
|
* If new taskq threads have been added.
|
|
*/
|
|
cpu = old_cpu;
|
|
for (i = old_cnt; i < cnt; i++) {
|
|
taskqgroup_cpu_create(qgroup, i, cpu);
|
|
|
|
for (k = 0; k < stride; k++)
|
|
cpu = CPU_NEXT(cpu);
|
|
}
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
qgroup->tqg_cnt = cnt;
|
|
qgroup->tqg_stride = stride;
|
|
|
|
/*
|
|
* Adjust drivers to use new taskqs.
|
|
*/
|
|
for (i = 0; i < old_cnt; i++) {
|
|
while ((gtask = LIST_FIRST(&qgroup->tqg_queue[i].tgc_tasks))) {
|
|
LIST_REMOVE(gtask, gt_list);
|
|
qgroup->tqg_queue[i].tgc_cnt--;
|
|
LIST_INSERT_HEAD(>ask_head, gtask, gt_list);
|
|
}
|
|
}
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
|
|
while ((gtask = LIST_FIRST(>ask_head))) {
|
|
LIST_REMOVE(gtask, gt_list);
|
|
if (gtask->gt_cpu == -1)
|
|
taskqgroup_attach_deferred(qgroup, gtask);
|
|
else if (taskqgroup_attach_cpu_deferred(qgroup, gtask))
|
|
taskqgroup_attach_deferred(qgroup, gtask);
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
for (i = 0; i < qgroup->tqg_cnt; i++) {
|
|
MPASS(qgroup->tqg_queue[i].tgc_taskq != NULL);
|
|
LIST_FOREACH(gtask, &qgroup->tqg_queue[i].tgc_tasks, gt_list)
|
|
MPASS(gtask->gt_taskqueue != NULL);
|
|
}
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
#endif
|
|
/*
|
|
* If taskq thread count has been reduced.
|
|
*/
|
|
for (i = cnt; i < old_cnt; i++)
|
|
taskqgroup_cpu_remove(qgroup, i);
|
|
|
|
taskqgroup_bind(qgroup);
|
|
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
qgroup->tqg_adjusting = 0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
|
|
{
|
|
int error;
|
|
|
|
mtx_lock(&qgroup->tqg_lock);
|
|
error = _taskqgroup_adjust(qgroup, cnt, stride);
|
|
mtx_unlock(&qgroup->tqg_lock);
|
|
|
|
return (error);
|
|
}
|
|
|
|
struct taskqgroup *
|
|
taskqgroup_create(const char *name)
|
|
{
|
|
struct taskqgroup *qgroup;
|
|
|
|
qgroup = malloc(sizeof(*qgroup), M_GTASKQUEUE, M_WAITOK | M_ZERO);
|
|
mtx_init(&qgroup->tqg_lock, "taskqgroup", NULL, MTX_DEF);
|
|
qgroup->tqg_name = name;
|
|
LIST_INIT(&qgroup->tqg_queue[0].tgc_tasks);
|
|
|
|
return (qgroup);
|
|
}
|
|
|
|
void
|
|
taskqgroup_destroy(struct taskqgroup *qgroup)
|
|
{
|
|
|
|
}
|
|
|
|
void
|
|
taskqgroup_config_gtask_init(void *ctx, struct grouptask *gtask, gtask_fn_t *fn,
|
|
const char *name)
|
|
{
|
|
|
|
GROUPTASK_INIT(gtask, 0, fn, ctx);
|
|
taskqgroup_attach(qgroup_config, gtask, gtask, NULL, NULL, name);
|
|
}
|
|
|
|
void
|
|
taskqgroup_config_gtask_deinit(struct grouptask *gtask)
|
|
{
|
|
|
|
taskqgroup_detach(qgroup_config, gtask);
|
|
}
|