Annotation of sys/sys/sched.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sched.h,v 1.16 2007/05/18 14:41:55 art Exp $ */
! 2: /* $NetBSD: sched.h,v 1.2 1999/02/28 18:14:58 ross Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1999 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Ross Harvey.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. All advertising materials mentioning features or use of this software
! 20: * must display the following acknowledgement:
! 21: * This product includes software developed by the NetBSD
! 22: * Foundation, Inc. and its contributors.
! 23: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 24: * contributors may be used to endorse or promote products derived
! 25: * from this software without specific prior written permission.
! 26: *
! 27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 37: * POSSIBILITY OF SUCH DAMAGE.
! 38: */
! 39:
! 40: /*-
! 41: * Copyright (c) 1982, 1986, 1991, 1993
! 42: * The Regents of the University of California. All rights reserved.
! 43: * (c) UNIX System Laboratories, Inc.
! 44: * All or some portions of this file are derived from material licensed
! 45: * to the University of California by American Telephone and Telegraph
! 46: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
! 47: * the permission of UNIX System Laboratories, Inc.
! 48: *
! 49: * Redistribution and use in source and binary forms, with or without
! 50: * modification, are permitted provided that the following conditions
! 51: * are met:
! 52: * 1. Redistributions of source code must retain the above copyright
! 53: * notice, this list of conditions and the following disclaimer.
! 54: * 2. Redistributions in binary form must reproduce the above copyright
! 55: * notice, this list of conditions and the following disclaimer in the
! 56: * documentation and/or other materials provided with the distribution.
! 57: * 3. Neither the name of the University nor the names of its contributors
! 58: * may be used to endorse or promote products derived from this software
! 59: * without specific prior written permission.
! 60: *
! 61: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 62: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 63: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 64: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 65: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 66: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 67: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 68: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 69: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 70: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 71: * SUCH DAMAGE.
! 72: *
! 73: * @(#)kern_clock.c 8.5 (Berkeley) 1/21/94
! 74: */
! 75:
! 76: #ifndef _SYS_SCHED_H_
! 77: #define _SYS_SCHED_H_
! 78:
! 79: /*
! 80: * Posix defines a <sched.h> which may want to include <sys/sched.h>
! 81: */
! 82:
! 83: /*
! 84: * CPU states.
! 85: * XXX Not really scheduler state, but no other good place to put
! 86: * it right now, and it really is per-CPU.
! 87: */
! 88: #define CP_USER 0
! 89: #define CP_NICE 1
! 90: #define CP_SYS 2
! 91: #define CP_INTR 3
! 92: #define CP_IDLE 4
! 93: #define CPUSTATES 5
! 94:
! 95: /*
! 96: * Per-CPU scheduler state.
! 97: * XXX - expose to userland for now.
! 98: */
! 99: struct schedstate_percpu {
! 100: struct timeval spc_runtime; /* time curproc started running */
! 101: __volatile int spc_schedflags; /* flags; see below */
! 102: u_int spc_schedticks; /* ticks for schedclock() */
! 103: u_int64_t spc_cp_time[CPUSTATES]; /* CPU state statistics */
! 104: u_char spc_curpriority; /* usrpri of curproc */
! 105: int spc_rrticks; /* ticks until roundrobin() */
! 106: int spc_pscnt; /* prof/stat counter */
! 107: int spc_psdiv; /* prof/stat divisor */
! 108: };
! 109:
! 110: #ifdef _KERNEL
! 111:
! 112: /* spc_flags */
! 113: #define SPCF_SEENRR 0x0001 /* process has seen roundrobin() */
! 114: #define SPCF_SHOULDYIELD 0x0002 /* process should yield the CPU */
! 115: #define SPCF_SWITCHCLEAR (SPCF_SEENRR|SPCF_SHOULDYIELD)
! 116:
! 117: #define PPQ (128 / NQS) /* priorities per queue */
! 118: #define NICE_WEIGHT 2 /* priorities per nice level */
! 119: #define ESTCPULIM(e) min((e), NICE_WEIGHT * PRIO_MAX - PPQ)
! 120:
! 121: extern int schedhz; /* ideally: 16 */
! 122: extern int rrticks_init; /* ticks per roundrobin() */
! 123:
! 124: struct proc;
! 125: void schedclock(struct proc *);
! 126: struct cpu_info;
! 127: void roundrobin(struct cpu_info *);
! 128:
! 129: #define sched_is_idle() (whichqs == 0)
! 130:
! 131: /* Inherit the parent's scheduler history */
! 132: #define scheduler_fork_hook(parent, child) do { \
! 133: (child)->p_estcpu = (parent)->p_estcpu; \
! 134: } while (0)
! 135:
! 136: /* Chargeback parents for the sins of their children. */
! 137: #define scheduler_wait_hook(parent, child) do { \
! 138: (parent)->p_estcpu = ESTCPULIM((parent)->p_estcpu + (child)->p_estcpu);\
! 139: } while (0)
! 140:
! 141: #ifndef IPL_SCHED
! 142: #define IPL_SCHED IPL_HIGH
! 143: #endif
! 144:
! 145: #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
! 146: #include <sys/lock.h>
! 147:
! 148: /*
! 149: * XXX Instead of using struct lock for the kernel lock and thus requiring us
! 150: * XXX to implement simplelocks, causing all sorts of fine-grained locks all
! 151: * XXX over our tree getting activated consuming both time and potentially
! 152: * XXX introducing locking protocol bugs.
! 153: */
! 154: extern struct __mp_lock sched_lock;
! 155:
! 156: #define SCHED_ASSERT_LOCKED() KASSERT(__mp_lock_held(&sched_lock))
! 157: #define SCHED_ASSERT_UNLOCKED() KASSERT(__mp_lock_held(&sched_lock) == 0)
! 158:
! 159: #define SCHED_LOCK(s) \
! 160: do { \
! 161: s = splsched(); \
! 162: __mp_lock(&sched_lock); \
! 163: } while (/* CONSTCOND */ 0)
! 164:
! 165: #define SCHED_UNLOCK(s) \
! 166: do { \
! 167: __mp_unlock(&sched_lock); \
! 168: splx(s); \
! 169: } while (/* CONSTCOND */ 0)
! 170:
! 171:
! 172: void sched_lock_idle(void);
! 173: void sched_unlock_idle(void);
! 174:
! 175: #else /* ! MULTIPROCESSOR || LOCKDEBUG */
! 176:
! 177: #define SCHED_ASSERT_LOCKED() splassert(IPL_SCHED);
! 178: #define SCHED_ASSERT_UNLOCKED() /* nothing */
! 179:
! 180: #define SCHED_LOCK(s) s = splsched()
! 181: #define SCHED_UNLOCK(s) splx(s)
! 182:
! 183: #endif /* MULTIPROCESSOR || LOCKDEBUG */
! 184:
! 185: #endif /* _KERNEL */
! 186: #endif /* _SYS_SCHED_H_ */
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