2ef41c0cb5
counter type, as threatened in rev.1.8 (the density doesn't need to be recorded since it can be derived from other fields). This doesn't affect binary compatibility, but new utilities won't be able to depend on the contents of this field because libc/gmon/gmon.c was broken -- it wrote garbage to the spare fields. Added a history counter type field to struct gmonparam. This breaks binary compatibility a little, since kgmon wanted to read the whole struct. Fixed kgmon to only depend on reading the critical earlier parts of the struct. This should also fix 6+ year old breakage of binary compatibility when the profrate field was added. Only initialize the new field in struct gmon for now, so that the compatibility code for this (in kgmon) gets tested. The compatibility code has to guesstimate the value. The new field in struct gmonparam is for the kernel to initialize so that kgmon doesn't have to guess.
206 lines
6.6 KiB
C
206 lines
6.6 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)gmon.h 8.2 (Berkeley) 1/4/94
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* $FreeBSD$
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*/
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#ifndef _SYS_GMON_H_
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#define _SYS_GMON_H_
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#include <machine/profile.h>
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/*
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* Structure prepended to gmon.out profiling data file.
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*/
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struct gmonhdr {
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u_long lpc; /* base pc address of sample buffer */
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u_long hpc; /* max pc address of sampled buffer */
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int ncnt; /* size of sample buffer (plus this header) */
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int version; /* version number */
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int profrate; /* profiling clock rate */
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int histcounter_type; /* size (in bits) and sign of HISTCOUNTER */
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int spare[2]; /* reserved */
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};
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#define GMONVERSION 0x00051879
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/*
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* Type of histogram counters used in the kernel.
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*/
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#ifdef GPROF4
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#define HISTCOUNTER int64_t
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#else
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#define HISTCOUNTER unsigned short
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#endif
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/*
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* Fraction of text space to allocate for histogram counters.
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* We allocate counters at the same or higher density as function
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* addresses, so that each counter belongs to a unique function.
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* A lower density of counters would give less resolution but a
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* higher density would be wasted.
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*/
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#define HISTFRACTION (FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER) == 0 \
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? 1 : FUNCTION_ALIGNMENT / sizeof(HISTCOUNTER))
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/*
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* Fraction of text space to allocate for from hash buckets.
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* The value of HASHFRACTION is based on the minimum number of bytes
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* of separation between two subroutine call points in the object code.
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* Given MIN_SUBR_SEPARATION bytes of separation the value of
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* HASHFRACTION is calculated as:
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*
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* HASHFRACTION = MIN_SUBR_SEPARATION / (2 * sizeof(short) - 1);
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*
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* For example, on the VAX, the shortest two call sequence is:
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*
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* calls $0,(r0)
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* calls $0,(r0)
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*
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* which is separated by only three bytes, thus HASHFRACTION is
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* calculated as:
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*
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* HASHFRACTION = 3 / (2 * 2 - 1) = 1
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*
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* Note that the division above rounds down, thus if MIN_SUBR_FRACTION
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* is less than three, this algorithm will not work!
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*
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* In practice, however, call instructions are rarely at a minimal
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* distance. Hence, we will define HASHFRACTION to be 2 across all
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* architectures. This saves a reasonable amount of space for
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* profiling data structures without (in practice) sacrificing
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* any granularity.
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*/
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/*
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* XXX I think the above analysis completely misses the point. I think
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* the point is that addresses in different functions must hash to
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* different values. Since the hash is essentially division by
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* sizeof(unsigned short), the correct formula is:
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*
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* HASHFRACTION = MIN_FUNCTION_ALIGNMENT / sizeof(unsigned short)
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*
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* Note that he unsigned short here has nothing to do with the one for
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* HISTFRACTION.
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*
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* Hash collisions from a two call sequence don't matter. They get
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* handled like collisions for calls to different addresses from the
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* same address through a function pointer.
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*/
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#define HASHFRACTION (FUNCTION_ALIGNMENT / sizeof(unsigned short) == 0 \
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? 1 : FUNCTION_ALIGNMENT / sizeof(unsigned short))
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/*
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* percent of text space to allocate for tostructs with a minimum.
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*/
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#define ARCDENSITY 2
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#define MINARCS 50
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/*
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* Limit on the number of arcs to so that arc numbers can be stored in
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* `*froms' and stored and incremented without overflow in links.
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*/
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#define MAXARCS (((u_long)1 << (8 * sizeof(u_short))) - 2)
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struct tostruct {
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u_long selfpc;
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long count;
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u_short link;
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u_short pad;
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};
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/*
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* a raw arc, with pointers to the calling site and
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* the called site and a count.
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*/
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struct rawarc {
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u_long raw_frompc;
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u_long raw_selfpc;
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long raw_count;
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};
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/*
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* general rounding functions.
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*/
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#define ROUNDDOWN(x,y) rounddown(x,y)
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#define ROUNDUP(x,y) roundup(x,y)
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/*
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* The profiling data structures are housed in this structure.
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*/
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struct gmonparam {
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int state;
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HISTCOUNTER *kcount;
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u_long kcountsize;
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u_short *froms;
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u_long fromssize;
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struct tostruct *tos;
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u_long tossize;
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long tolimit;
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uintfptr_t lowpc;
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uintfptr_t highpc;
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u_long textsize;
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u_long hashfraction;
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int profrate; /* XXX wrong type to match gmonhdr */
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HISTCOUNTER *cputime_count;
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int cputime_overhead;
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HISTCOUNTER *mcount_count;
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int mcount_overhead;
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int mcount_post_overhead;
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int mcount_pre_overhead;
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HISTCOUNTER *mexitcount_count;
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int mexitcount_overhead;
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int mexitcount_post_overhead;
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int mexitcount_pre_overhead;
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int histcounter_type;
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};
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extern struct gmonparam _gmonparam;
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/*
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* Possible states of profiling.
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*/
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#define GMON_PROF_ON 0
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#define GMON_PROF_BUSY 1
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#define GMON_PROF_ERROR 2
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#define GMON_PROF_OFF 3
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#define GMON_PROF_HIRES 4
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/*
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* Sysctl definitions for extracting profiling information from the kernel.
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*/
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#define GPROF_STATE 0 /* int: profiling enabling variable */
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#define GPROF_COUNT 1 /* struct: profile tick count buffer */
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#define GPROF_FROMS 2 /* struct: from location hash bucket */
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#define GPROF_TOS 3 /* struct: destination/count structure */
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#define GPROF_GMONPARAM 4 /* struct: profiling parameters (see above) */
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#endif /* !_SYS_GMON_H_ */
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