Current File : //proc/self/root/usr/include/sys/gmon.h
/*-
* Copyright (c) 1982, 1986, 1992, 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.
* 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.
*
* @(#)gmon.h 8.2 (Berkeley) 1/4/94
*/
#ifndef _SYS_GMON_H
#define _SYS_GMON_H 1
#include <features.h>
#include <sys/types.h>
/*
* See gmon_out.h for gmon.out format.
*/
/* structure emitted by "gcc -a". This must match struct bb in
gcc/libgcc2.c. It is OK for gcc to declare a longer structure as
long as the members below are present. */
struct __bb
{
long zero_word;
const char *filename;
long *counts;
long ncounts;
struct __bb *next;
const unsigned long *addresses;
};
extern struct __bb *__bb_head;
/*
* histogram counters are unsigned shorts (according to the kernel).
*/
#define HISTCOUNTER unsigned short
/*
* fraction of text space to allocate for histogram counters here, 1/2
*/
#define HISTFRACTION 2
/*
* Fraction of text space to allocate for from hash buckets.
* The value of HASHFRACTION is based on the minimum number of bytes
* of separation between two subroutine call points in the object code.
* Given MIN_SUBR_SEPARATION bytes of separation the value of
* HASHFRACTION is calculated as:
*
* HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
*
* For example, on the VAX, the shortest two call sequence is:
*
* calls $0,(r0)
* calls $0,(r0)
*
* which is separated by only three bytes, thus HASHFRACTION is
* calculated as:
*
* HASHFRACTION = 3 / (2 * 2 - 1) = 1
*
* Note that the division above rounds down, thus if MIN_SUBR_FRACTION
* is less than three, this algorithm will not work!
*
* In practice, however, call instructions are rarely at a minimal
* distance. Hence, we will define HASHFRACTION to be 2 across all
* architectures. This saves a reasonable amount of space for
* profiling data structures without (in practice) sacrificing
* any granularity.
*/
#define HASHFRACTION 2
/*
* Percent of text space to allocate for tostructs.
* This is a heuristic; we will fail with a warning when profiling programs
* with a very large number of very small functions, but that's
* normally OK.
* 2 is probably still a good value for normal programs.
* Profiling a test case with 64000 small functions will work if
* you raise this value to 3 and link statically (which bloats the
* text size, thus raising the number of arcs expected by the heuristic).
*/
#define ARCDENSITY 3
/*
* Always allocate at least this many tostructs. This
* hides the inadequacy of the ARCDENSITY heuristic, at least
* for small programs.
*
* Value can be overridden at runtime by glibc.gmon.minarcs tunable.
*/
#define MINARCS 50
/*
* The type used to represent indices into gmonparam.tos[].
*/
#define ARCINDEX unsigned long
/*
* Maximum number of arcs we want to allow.
* Used to be max representable value of ARCINDEX minus 2, but now
* that ARCINDEX is a long, that's too large; we don't really want
* to allow a 48 gigabyte table.
*
* Value can be overridden at runtime by glibc.gmon.maxarcs tunable.
*/
#define MAXARCS (1 << 20)
struct tostruct {
unsigned long selfpc;
long count;
ARCINDEX link;
};
/*
* a raw arc, with pointers to the calling site and
* the called site and a count.
*/
struct rawarc {
unsigned long raw_frompc;
unsigned long raw_selfpc;
long raw_count;
};
/*
* general rounding functions.
*/
#define ROUNDDOWN(x,y) (((x)/(y))*(y))
#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
/*
* The profiling data structures are housed in this structure.
*/
struct gmonparam {
long int state;
unsigned short *kcount;
unsigned long kcountsize;
ARCINDEX *froms;
unsigned long fromssize;
struct tostruct *tos;
unsigned long tossize;
long tolimit;
unsigned long lowpc;
unsigned long highpc;
unsigned long textsize;
unsigned long hashfraction;
long log_hashfraction;
};
/*
* Possible states of profiling.
*/
#define GMON_PROF_ON 0
#define GMON_PROF_BUSY 1
#define GMON_PROF_ERROR 2
#define GMON_PROF_OFF 3
/*
* Sysctl definitions for extracting profiling information from the kernel.
*/
#define GPROF_STATE 0 /* int: profiling enabling variable */
#define GPROF_COUNT 1 /* struct: profile tick count buffer */
#define GPROF_FROMS 2 /* struct: from location hash bucket */
#define GPROF_TOS 3 /* struct: destination/count structure */
#define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
__BEGIN_DECLS
/* Set up data structures and start profiling. */
extern void __monstartup (unsigned long __lowpc, unsigned long __highpc) __THROW;
extern void monstartup (unsigned long __lowpc, unsigned long __highpc) __THROW;
/* Clean up profiling and write out gmon.out. */
extern void _mcleanup (void) __THROW;
__END_DECLS
#endif /* sys/gmon.h */
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