314 lines
8.7 KiB
C
314 lines
8.7 KiB
C
/* $NetBSD: subr_prof.c,v 1.29 2003/12/04 19:38:23 atatat Exp $ */
|
|
|
|
/*-
|
|
* 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. 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.
|
|
*
|
|
* @(#)subr_prof.c 8.4 (Berkeley) 2/14/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: subr_prof.c,v 1.29 2003/12/04 19:38:23 atatat Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/user.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/sa.h>
|
|
#include <sys/syscallargs.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <machine/cpu.h>
|
|
|
|
#ifdef GPROF
|
|
#include <sys/malloc.h>
|
|
#include <sys/gmon.h>
|
|
|
|
MALLOC_DEFINE(M_GPROF, "gprof", "kernel profiling buffer");
|
|
|
|
/*
|
|
* Froms is actually a bunch of unsigned shorts indexing tos
|
|
*/
|
|
struct gmonparam _gmonparam = { GMON_PROF_OFF };
|
|
|
|
/* Actual start of the kernel text segment. */
|
|
extern char kernel_text[];
|
|
|
|
extern char etext[];
|
|
|
|
|
|
void
|
|
kmstartup()
|
|
{
|
|
char *cp;
|
|
struct gmonparam *p = &_gmonparam;
|
|
/*
|
|
* Round lowpc and highpc to multiples of the density we're using
|
|
* so the rest of the scaling (here and in gprof) stays in ints.
|
|
*/
|
|
p->lowpc = ROUNDDOWN(((u_long)kernel_text),
|
|
HISTFRACTION * sizeof(HISTCOUNTER));
|
|
p->highpc = ROUNDUP((u_long)etext,
|
|
HISTFRACTION * sizeof(HISTCOUNTER));
|
|
p->textsize = p->highpc - p->lowpc;
|
|
printf("Profiling kernel, textsize=%ld [%lx..%lx]\n",
|
|
p->textsize, p->lowpc, p->highpc);
|
|
p->kcountsize = p->textsize / HISTFRACTION;
|
|
p->hashfraction = HASHFRACTION;
|
|
p->fromssize = p->textsize / HASHFRACTION;
|
|
p->tolimit = p->textsize * ARCDENSITY / 100;
|
|
if (p->tolimit < MINARCS)
|
|
p->tolimit = MINARCS;
|
|
else if (p->tolimit > MAXARCS)
|
|
p->tolimit = MAXARCS;
|
|
p->tossize = p->tolimit * sizeof(struct tostruct);
|
|
cp = (char *)malloc(p->kcountsize + p->fromssize + p->tossize,
|
|
M_GPROF, M_NOWAIT);
|
|
if (cp == 0) {
|
|
printf("No memory for profiling.\n");
|
|
return;
|
|
}
|
|
memset(cp, 0, p->kcountsize + p->tossize + p->fromssize);
|
|
p->tos = (struct tostruct *)cp;
|
|
cp += p->tossize;
|
|
p->kcount = (u_short *)cp;
|
|
cp += p->kcountsize;
|
|
p->froms = (u_short *)cp;
|
|
}
|
|
|
|
/*
|
|
* Return kernel profiling information.
|
|
*/
|
|
/*
|
|
* sysctl helper routine for kern.profiling subtree. enables/disables
|
|
* kernel profiling and gives out copies of the profiling data.
|
|
*/
|
|
static int
|
|
sysctl_kern_profiling(SYSCTLFN_ARGS)
|
|
{
|
|
struct gmonparam *gp = &_gmonparam;
|
|
int error;
|
|
struct sysctlnode node;
|
|
|
|
node = *rnode;
|
|
|
|
switch (node.sysctl_num) {
|
|
case GPROF_STATE:
|
|
node.sysctl_data = &gp->state;
|
|
break;
|
|
case GPROF_COUNT:
|
|
node.sysctl_data = gp->kcount;
|
|
node.sysctl_size = gp->kcountsize;
|
|
break;
|
|
case GPROF_FROMS:
|
|
node.sysctl_data = gp->froms;
|
|
node.sysctl_size = gp->fromssize;
|
|
break;
|
|
case GPROF_TOS:
|
|
node.sysctl_data = gp->tos;
|
|
node.sysctl_size = gp->tossize;
|
|
break;
|
|
case GPROF_GMONPARAM:
|
|
node.sysctl_data = gp;
|
|
node.sysctl_size = sizeof(*gp);
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
error = sysctl_lookup(SYSCTLFN_CALL(&node));
|
|
if (error || newp == NULL)
|
|
return (error);
|
|
|
|
if (node.sysctl_num == GPROF_STATE) {
|
|
if (gp->state == GMON_PROF_OFF)
|
|
stopprofclock(&proc0);
|
|
else
|
|
startprofclock(&proc0);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_SETUP(sysctl_kern_gprof_setup, "sysctl kern.profiling subtree setup")
|
|
{
|
|
|
|
sysctl_createv(SYSCTL_PERMANENT,
|
|
CTLTYPE_NODE, "kern", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_KERN, CTL_EOL);
|
|
sysctl_createv(SYSCTL_PERMANENT,
|
|
CTLTYPE_NODE, "profiling", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, CTL_EOL);
|
|
|
|
sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
|
|
CTLTYPE_INT, "state", NULL,
|
|
sysctl_kern_profiling, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, GPROF_STATE, CTL_EOL);
|
|
sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
|
|
CTLTYPE_STRUCT, "count", NULL,
|
|
sysctl_kern_profiling, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, GPROF_COUNT, CTL_EOL);
|
|
sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
|
|
CTLTYPE_STRUCT, "froms", NULL,
|
|
sysctl_kern_profiling, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, GPROF_FROMS, CTL_EOL);
|
|
sysctl_createv(SYSCTL_PERMANENT|SYSCTL_READWRITE,
|
|
CTLTYPE_STRUCT, "tos", NULL,
|
|
sysctl_kern_profiling, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, GPROF_TOS, CTL_EOL);
|
|
sysctl_createv(SYSCTL_PERMANENT,
|
|
CTLTYPE_STRUCT, "gmonparam", NULL,
|
|
sysctl_kern_profiling, 0, NULL, 0,
|
|
CTL_KERN, KERN_PROF, GPROF_GMONPARAM, CTL_EOL);
|
|
}
|
|
#endif /* GPROF */
|
|
|
|
/*
|
|
* Profiling system call.
|
|
*
|
|
* The scale factor is a fixed point number with 16 bits of fraction, so that
|
|
* 1.0 is represented as 0x10000. A scale factor of 0 turns off profiling.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_profil(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct sys_profil_args /* {
|
|
syscallarg(caddr_t) samples;
|
|
syscallarg(u_int) size;
|
|
syscallarg(u_int) offset;
|
|
syscallarg(u_int) scale;
|
|
} */ *uap = v;
|
|
struct proc *p = l->l_proc;
|
|
struct uprof *upp;
|
|
int s;
|
|
|
|
if (SCARG(uap, scale) > (1 << 16))
|
|
return (EINVAL);
|
|
if (SCARG(uap, scale) == 0) {
|
|
stopprofclock(p);
|
|
return (0);
|
|
}
|
|
upp = &p->p_stats->p_prof;
|
|
|
|
/* Block profile interrupts while changing state. */
|
|
s = splstatclock();
|
|
upp->pr_off = SCARG(uap, offset);
|
|
upp->pr_scale = SCARG(uap, scale);
|
|
upp->pr_base = SCARG(uap, samples);
|
|
upp->pr_size = SCARG(uap, size);
|
|
startprofclock(p);
|
|
splx(s);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Scale is a fixed-point number with the binary point 16 bits
|
|
* into the value, and is <= 1.0. pc is at most 32 bits, so the
|
|
* intermediate result is at most 48 bits.
|
|
*/
|
|
#define PC_TO_INDEX(pc, prof) \
|
|
((int)(((u_quad_t)((pc) - (prof)->pr_off) * \
|
|
(u_quad_t)((prof)->pr_scale)) >> 16) & ~1)
|
|
|
|
/*
|
|
* Collect user-level profiling statistics; called on a profiling tick,
|
|
* when a process is running in user-mode. This routine may be called
|
|
* from an interrupt context. We try to update the user profiling buffers
|
|
* cheaply with fuswintr() and suswintr(). If that fails, we revert to
|
|
* an AST that will vector us to trap() with a context in which copyin
|
|
* and copyout will work. Trap will then call addupc_task().
|
|
*
|
|
* Note that we may (rarely) not get around to the AST soon enough, and
|
|
* lose profile ticks when the next tick overwrites this one, but in this
|
|
* case the system is overloaded and the profile is probably already
|
|
* inaccurate.
|
|
*/
|
|
void
|
|
addupc_intr(p, pc)
|
|
struct proc *p;
|
|
u_long pc;
|
|
{
|
|
struct uprof *prof;
|
|
caddr_t addr;
|
|
u_int i;
|
|
int v;
|
|
|
|
prof = &p->p_stats->p_prof;
|
|
if (pc < prof->pr_off ||
|
|
(i = PC_TO_INDEX(pc, prof)) >= prof->pr_size)
|
|
return; /* out of range; ignore */
|
|
|
|
addr = prof->pr_base + i;
|
|
if ((v = fuswintr(addr)) == -1 || suswintr(addr, v + 1) == -1) {
|
|
prof->pr_addr = pc;
|
|
prof->pr_ticks++;
|
|
need_proftick(p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Much like before, but we can afford to take faults here. If the
|
|
* update fails, we simply turn off profiling.
|
|
*/
|
|
void
|
|
addupc_task(p, pc, ticks)
|
|
struct proc *p;
|
|
u_long pc;
|
|
u_int ticks;
|
|
{
|
|
struct uprof *prof;
|
|
caddr_t addr;
|
|
u_int i;
|
|
u_short v;
|
|
|
|
/* Testing P_PROFIL may be unnecessary, but is certainly safe. */
|
|
if ((p->p_flag & P_PROFIL) == 0 || ticks == 0)
|
|
return;
|
|
|
|
prof = &p->p_stats->p_prof;
|
|
if (pc < prof->pr_off ||
|
|
(i = PC_TO_INDEX(pc, prof)) >= prof->pr_size)
|
|
return;
|
|
|
|
addr = prof->pr_base + i;
|
|
if (copyin(addr, (caddr_t)&v, sizeof(v)) == 0) {
|
|
v += ticks;
|
|
if (copyout((caddr_t)&v, addr, sizeof(v)) == 0)
|
|
return;
|
|
}
|
|
stopprofclock(p);
|
|
}
|