This is xnu-8019. See this file in:
/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*-
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)trace.h	8.1 (Berkeley) 6/2/93
 */

#ifndef _SYS_TRACE_H_
#define _SYS_TRACE_H_

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_OBSOLETE
/*
 * File system buffer tracing points; all trace <pack(dev, size), bn>
 */
#define TR_BREADHIT     0       /* buffer read found in cache */
#define TR_BREADMISS    1       /* buffer read not in cache */
#define TR_BWRITE       2       /* buffer written */
#define TR_BREADHITRA   3       /* buffer read-ahead found in cache */
#define TR_BREADMISSRA  4       /* buffer read-ahead not in cache */
#define TR_XFODMISS     5       /* exe fod read */
#define TR_XFODHIT      6       /* exe fod read */
#define TR_BRELSE       7       /* brelse */
#define TR_BREALLOC     8       /* expand/contract a buffer */

/*
 * Memory allocator trace points; all trace the amount of memory involved
 */
#define TR_MALL         10      /* memory allocated */

/*
 * Paging trace points: all are <vaddr, pid>
 */
#define TR_INTRANS      20      /* page intransit block */
#define TR_EINTRANS     21      /* page intransit wait done */
#define TR_FRECLAIM     22      /* reclaim from free list */
#define TR_RECLAIM      23      /* reclaim from loop */
#define TR_XSFREC       24      /* reclaim from free list instead of drum */
#define TR_XIFREC       25      /* reclaim from free list instead of fsys */
#define TR_WAITMEM      26      /* wait for memory in pagein */
#define TR_EWAITMEM     27      /* end memory wait in pagein */
#define TR_ZFOD         28      /* zfod page fault */
#define TR_EXFOD        29      /* exec fod page fault */
#define TR_VRFOD        30      /* vread fod page fault */
#define TR_CACHEFOD     31      /* fod in file system cache */
#define TR_SWAPIN       32      /* drum page fault */
#define TR_PGINDONE     33      /* page in done */
#define TR_SWAPIO       34      /* swap i/o request arrives */

/*
 * System call trace points.
 */
#define TR_VADVISE      40      /* vadvise occurred with <arg, pid> */

/*
 * Miscellaneous
 */
#define TR_STAMP        45      /* user said vtrace(VTR_STAMP, value); */

/*
 * This defines the size of the trace flags array.
 */
#define TR_NFLAGS       100     /* generous */

#define TRCSIZ          4096

/*
 * Specifications of the vtrace() system call, which takes one argument.
 */
#define VTRACE          64+51

#define VTR_DISABLE     0               /* set a trace flag to 0 */
#define VTR_ENABLE      1               /* set a trace flag to 1 */
#define VTR_VALUE       2               /* return value of a trace flag */
#define VTR_UALARM      3               /* set alarm to go off (sig 16) */
                                        /* in specified number of hz */
#define VTR_STAMP       4               /* user specified stamp */

#ifdef KERNEL
#if TRACE
extern struct   proc *traceproc;
extern int      tracewhich, tracebuf[TRCSIZ];
extern u_int    tracex;
extern char     traceflags[TR_NFLAGS];
#define pack(v, b)       (((v)->v_mount->mnt_vfsstat.f_fsid.val[0])<<16)|(b)
#define trace(a, b, c) {                                                \
	if (traceflags[a])                                              \
	        trace1(a,b,c);                                          \
}
#else
#define trace(a, b, c)
#endif
#endif /* KERNEL */

#endif /* __APPLE_API_OBSOLETE */

#endif /* !_SYS_TRACE_H_ */