16c229ea7c
"earliest" firing callout in a bucket. This allows us to skip the scan up the bucket if no callouts are due in the bucket. A cheap O(1) hint update is done at callout insertion (if new callout is earlier than hint) and removal (is bucket empty). A thorough refresh of the hint is done when the bucket is traversed. This doesn't matter much on machines with small values of hz (e.g. i386), but on systems with large values of hz (e.g. Alpha), it has a definite positive effect. Also, keep the callwheel stats in evcnts, so that you can view them with "vmstat -e".
128 lines
5.5 KiB
C
128 lines
5.5 KiB
C
/* $NetBSD: callout.h,v 1.16 2001/09/11 04:32:19 thorpej Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)callout.h 8.2 (Berkeley) 1/21/94
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*/
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#ifndef _SYS_CALLOUT_H_
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#define _SYS_CALLOUT_H_
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#include <sys/queue.h>
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struct callout_queue {
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uint64_t cq_hint; /* earliest callout in bkt */
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TAILQ_HEAD(, callout) cq_q; /* callouts in this bucket */
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};
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struct callout {
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TAILQ_ENTRY(callout) c_link;
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u_int64_t c_time; /* when callout fires */
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void *c_arg; /* function argument */
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void (*c_func)(void *); /* functiuon to call */
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int c_flags; /* state of this entry */
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};
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#define CALLOUT_ACTIVE 0x0001 /* callout is active */
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#define CALLOUT_PENDING 0x0002 /* callout time has not yet arrived */
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#define CALLOUT_INITIALIZER { { NULL, NULL }, 0, NULL, NULL, 0 }
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#ifdef _KERNEL
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extern struct callout_queue *callwheel;
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extern int callwheelsize, callwheelbits, callwheelmask;
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extern int ncallout;
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#ifdef CALLWHEEL_STATS
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extern int *callwheel_sizes; /* for allocsys() */
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#endif
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void callout_setsize(void);
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void callout_startup(void);
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void callout_init(struct callout *);
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void callout_reset(struct callout *, int, void (*)(void *), void *);
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void callout_stop(struct callout *);
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#ifdef CALLWHEEL_STATS
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void callout_showstats(void);
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#endif
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#define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
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#define callout_pending(c) ((c)->c_flags & CALLOUT_PENDING)
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#define callout_expired(c) (callout_pending((c)) == 0)
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#define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)
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#endif /* _KERNEL */
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#endif /* !_SYS_CALLOUT_H_ */
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