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Annotation of sys/sys/gmon.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: gmon.h,v 1.4 2003/06/02 23:28:21 millert Exp $        */
        !             2: /*     $NetBSD: gmon.h,v 1.5 1996/04/09 20:55:30 cgd Exp $     */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1982, 1986, 1992, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  *
        !            32:  *     @(#)gmon.h      8.2 (Berkeley) 1/4/94
        !            33:  */
        !            34:
        !            35: #ifndef _SYS_GMON_H_
        !            36: #define _SYS_GMON_H_
        !            37:
        !            38: #include <machine/profile.h>
        !            39:
        !            40: /*
        !            41:  * Structure prepended to gmon.out profiling data file.
        !            42:  */
        !            43: struct gmonhdr {
        !            44:        u_long  lpc;            /* base pc address of sample buffer */
        !            45:        u_long  hpc;            /* max pc address of sampled buffer */
        !            46:        int     ncnt;           /* size of sample buffer (plus this header) */
        !            47:        int     version;        /* version number */
        !            48:        int     profrate;       /* profiling clock rate */
        !            49:        int     spare[3];       /* reserved */
        !            50: };
        !            51: #define GMONVERSION    0x00051879
        !            52:
        !            53: /*
        !            54:  * histogram counters are unsigned shorts (according to the kernel).
        !            55:  */
        !            56: #define        HISTCOUNTER     unsigned short
        !            57:
        !            58: /*
        !            59:  * fraction of text space to allocate for histogram counters here, 1/2
        !            60:  */
        !            61: #define        HISTFRACTION    2
        !            62:
        !            63: /*
        !            64:  * Fraction of text space to allocate for from hash buckets.
        !            65:  * The value of HASHFRACTION is based on the minimum number of bytes
        !            66:  * of separation between two subroutine call points in the object code.
        !            67:  * Given MIN_SUBR_SEPARATION bytes of separation the value of
        !            68:  * HASHFRACTION is calculated as:
        !            69:  *
        !            70:  *     HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
        !            71:  *
        !            72:  * For example, on the VAX, the shortest two call sequence is:
        !            73:  *
        !            74:  *     calls   $0,(r0)
        !            75:  *     calls   $0,(r0)
        !            76:  *
        !            77:  * which is separated by only three bytes, thus HASHFRACTION is
        !            78:  * calculated as:
        !            79:  *
        !            80:  *     HASHFRACTION = 3 / (2 * 2 - 1) = 1
        !            81:  *
        !            82:  * Note that the division above rounds down, thus if MIN_SUBR_FRACTION
        !            83:  * is less than three, this algorithm will not work!
        !            84:  *
        !            85:  * In practice, however, call instructions are rarely at a minimal
        !            86:  * distance.  Hence, we will define HASHFRACTION to be 2 across all
        !            87:  * architectures.  This saves a reasonable amount of space for
        !            88:  * profiling data structures without (in practice) sacrificing
        !            89:  * any granularity.
        !            90:  */
        !            91: #define        HASHFRACTION    2
        !            92:
        !            93: /*
        !            94:  * percent of text space to allocate for tostructs with a minimum.
        !            95:  */
        !            96: #define ARCDENSITY     2
        !            97: #define MINARCS                50
        !            98: #define MAXARCS                ((1 << (8 * sizeof(HISTCOUNTER))) - 2)
        !            99:
        !           100: struct tostruct {
        !           101:        u_long  selfpc;
        !           102:        long    count;
        !           103:        u_short link;
        !           104:        u_short pad;
        !           105: };
        !           106:
        !           107: /*
        !           108:  * a raw arc, with pointers to the calling site and
        !           109:  * the called site and a count.
        !           110:  */
        !           111: struct rawarc {
        !           112:        u_long  raw_frompc;
        !           113:        u_long  raw_selfpc;
        !           114:        long    raw_count;
        !           115: };
        !           116:
        !           117: /*
        !           118:  * general rounding functions.
        !           119:  */
        !           120: #define ROUNDDOWN(x,y) (((x)/(y))*(y))
        !           121: #define ROUNDUP(x,y)   ((((x)+(y)-1)/(y))*(y))
        !           122:
        !           123: /*
        !           124:  * The profiling data structures are housed in this structure.
        !           125:  */
        !           126: struct gmonparam {
        !           127:        int             state;
        !           128:        u_short         *kcount;
        !           129:        u_long          kcountsize;
        !           130:        u_short         *froms;
        !           131:        u_long          fromssize;
        !           132:        struct tostruct *tos;
        !           133:        u_long          tossize;
        !           134:        long            tolimit;
        !           135:        u_long          lowpc;
        !           136:        u_long          highpc;
        !           137:        u_long          textsize;
        !           138:        u_long          hashfraction;
        !           139: };
        !           140: extern struct gmonparam _gmonparam;
        !           141:
        !           142: /*
        !           143:  * Possible states of profiling.
        !           144:  */
        !           145: #define        GMON_PROF_ON    0
        !           146: #define        GMON_PROF_BUSY  1
        !           147: #define        GMON_PROF_ERROR 2
        !           148: #define        GMON_PROF_OFF   3
        !           149:
        !           150: /*
        !           151:  * Sysctl definitions for extracting profiling information from the kernel.
        !           152:  */
        !           153: #define        GPROF_STATE     0       /* int: profiling enabling variable */
        !           154: #define        GPROF_COUNT     1       /* struct: profile tick count buffer */
        !           155: #define        GPROF_FROMS     2       /* struct: from location hash bucket */
        !           156: #define        GPROF_TOS       3       /* struct: destination/count structure */
        !           157: #define        GPROF_GMONPARAM 4       /* struct: profiling parameters (see above) */
        !           158: #endif /* !_SYS_GMON_H_ */

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