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Message-Id: <1165906989601@2ka.mipt.ru> Date: Tue, 12 Dec 2006 10:03:09 +0300 From: Evgeniy Polyakov <johnpol@....mipt.ru> To: Evgeniy Polyakov <johnpol@....mipt.ru> Cc: David Miller <davem@...emloft.net>, Ulrich Drepper <drepper@...hat.com>, Andrew Morton <akpm@...l.org>, Evgeniy Polyakov <johnpol@....mipt.ru>, netdev <netdev@...r.kernel.org>, Zach Brown <zach.brown@...cle.com>, Christoph Hellwig <hch@...radead.org>, Chase Venters <chase.venters@...entec.com>, Johann Borck <johann.borck@...sedata.com>, linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org> Subject: [take27 5/8] kevent: Timer notifications. Timer notifications. Timer notifications can be used for fine grained per-process time management, since interval timers are very inconvenient to use, and they are limited. This subsystem uses high-resolution timers. id.raw[0] is used as number of seconds id.raw[1] is used as number of nanoseconds Signed-off-by: Evgeniy Polyakov <johnpol@....mipt.ru> diff --git a/kernel/kevent/kevent_timer.c b/kernel/kevent/kevent_timer.c new file mode 100644 index 0000000..df93049 --- /dev/null +++ b/kernel/kevent/kevent_timer.c @@ -0,0 +1,112 @@ +/* + * 2006 Copyright (c) Evgeniy Polyakov <johnpol@....mipt.ru> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/hrtimer.h> +#include <linux/jiffies.h> +#include <linux/kevent.h> + +struct kevent_timer +{ + struct hrtimer ktimer; + struct kevent_storage ktimer_storage; + struct kevent *ktimer_event; +}; + +static int kevent_timer_func(struct hrtimer *timer) +{ + struct kevent_timer *t = container_of(timer, struct kevent_timer, ktimer); + struct kevent *k = t->ktimer_event; + + kevent_storage_ready(&t->ktimer_storage, NULL, KEVENT_MASK_ALL); + hrtimer_forward(timer, timer->base->softirq_time, + ktime_set(k->event.id.raw[0], k->event.id.raw[1])); + return HRTIMER_RESTART; +} + +static struct lock_class_key kevent_timer_key; + +static int kevent_timer_enqueue(struct kevent *k) +{ + int err; + struct kevent_timer *t; + + t = kmalloc(sizeof(struct kevent_timer), GFP_KERNEL); + if (!t) + return -ENOMEM; + + hrtimer_init(&t->ktimer, CLOCK_MONOTONIC, HRTIMER_REL); + t->ktimer.expires = ktime_set(k->event.id.raw[0], k->event.id.raw[1]); + t->ktimer.function = kevent_timer_func; + t->ktimer_event = k; + + err = kevent_storage_init(&t->ktimer, &t->ktimer_storage); + if (err) + goto err_out_free; + lockdep_set_class(&t->ktimer_storage.lock, &kevent_timer_key); + + err = kevent_storage_enqueue(&t->ktimer_storage, k); + if (err) + goto err_out_st_fini; + + hrtimer_start(&t->ktimer, t->ktimer.expires, HRTIMER_REL); + + return 0; + +err_out_st_fini: + kevent_storage_fini(&t->ktimer_storage); +err_out_free: + kfree(t); + + return err; +} + +static int kevent_timer_dequeue(struct kevent *k) +{ + struct kevent_storage *st = k->st; + struct kevent_timer *t = container_of(st, struct kevent_timer, ktimer_storage); + + hrtimer_cancel(&t->ktimer); + kevent_storage_dequeue(st, k); + kfree(t); + + return 0; +} + +static int kevent_timer_callback(struct kevent *k) +{ + k->event.ret_data[0] = jiffies_to_msecs(jiffies); + return 1; +} + +static int __init kevent_init_timer(void) +{ + struct kevent_callbacks tc = { + .callback = &kevent_timer_callback, + .enqueue = &kevent_timer_enqueue, + .dequeue = &kevent_timer_dequeue}; + + return kevent_add_callbacks(&tc, KEVENT_TIMER); +} +module_init(kevent_init_timer); + - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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