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Added a sysctl (machdep.cputime_clock) to select the clock used by
"high resolution" profiling. The available clocks are: - the i8254 clock - on non-SMP i586's and i686's: the TSC - on systems with I586_PMC_GUPROF configured, and PERFMON configured and available: all the performance counters. This is unfinshed (there are problems with locking out the PERFMON device driver, and with losing calibration after switching the clock), but better than static configuration or writing to kmem. Changed ifdefs to avoid generating code for non-working option combinations.
This commit is contained in:
Bruce Evans
parent
5b76055a53
commit
043e37feab
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=31395
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@ -23,17 +23,18 @@
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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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* $Id$
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* $Id: prof_machdep.c,v 1.6 1997/02/22 09:36:59 peter Exp $
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*/
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#ifdef GUPROF
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#include "opt_cpu.h"
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#include "opt_i586_guprof.h"
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#include "opt_perfmon.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/gmon.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/clock.h>
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#include <machine/perfmon.h>
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@ -175,14 +176,14 @@ cputime()
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u_char high, low;
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static u_int prev_count;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (cputime_clock == CPUTIME_CLOCK_I586_CTR) {
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count = (u_int)rdtsc();
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delta = (int)(count - prev_count);
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prev_count = count;
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return (delta);
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}
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#ifdef I586_PMC_GUPROF
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
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/*
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* XXX permon_read() should be inlined so that the
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@ -196,8 +197,8 @@ cputime()
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prev_count = count;
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return (delta);
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}
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#endif /* I586_PMC_GUPROF */
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#endif /* I586_CPU or I686_CPU */
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#endif /* PERFMON && I586_PMC_GUPROF */
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#endif /* (I586_CPU || I686_CPU) && !SMP */
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/*
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* Read the current value of the 8254 timer counter 0.
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@ -223,6 +224,49 @@ cputime()
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return (delta);
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}
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static int
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sysctl_machdep_cputime_clock SYSCTL_HANDLER_ARGS
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{
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int clock;
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int event;
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int error;
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struct pmc pmc;
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clock = cputime_clock;
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (clock == CPUTIME_CLOCK_I586_PMC) {
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pmc.pmc_val = cputime_clock_pmc_conf;
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clock += pmc.pmc_event;
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}
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#endif
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error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
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if (error == 0 && req->newptr != NULL) {
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (clock >= CPUTIME_CLOCK_I586_PMC) {
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event = clock - CPUTIME_CLOCK_I586_PMC;
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if (event >= 256)
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return (EINVAL);
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pmc.pmc_num = 0;
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pmc.pmc_event = event;
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pmc.pmc_unit = 0;
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pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
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pmc.pmc_mask = 0;
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cputime_clock_pmc_conf = pmc.pmc_val;
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cputime_clock = CPUTIME_CLOCK_I586_PMC;
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} else
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#endif
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{
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if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
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return (EINVAL);
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cputime_clock = clock;
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}
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}
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return (error);
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}
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SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
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0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
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/*
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* The start and stop routines need not be here since we turn off profiling
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* before calling them. They are here for convenience.
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@ -234,16 +278,16 @@ startguprof(gp)
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{
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if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
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cputime_clock = CPUTIME_CLOCK_I8254;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (i586_ctr_freq != 0)
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cputime_clock = CPUTIME_CLOCK_I586_CTR;
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#endif
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}
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gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (cputime_clock == CPUTIME_CLOCK_I586_CTR)
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gp->profrate = i586_ctr_freq;
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#ifdef I586_PMC_GUPROF
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
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if (perfmon_avail() &&
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perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
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@ -268,8 +312,8 @@ startguprof(gp)
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}
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}
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}
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#endif /* I586_PMC_GUPROF */
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#endif /* I586_CPU or I686_CPU */
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#endif /* PERFMON && I586_PMC_GUPROF */
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#endif /* (I586_CPU || I686_CPU) && !SMP */
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cputime_bias = 0;
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cputime();
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}
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@ -23,17 +23,18 @@
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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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* $Id$
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* $Id: prof_machdep.c,v 1.6 1997/02/22 09:36:59 peter Exp $
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*/
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#ifdef GUPROF
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#include "opt_cpu.h"
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#include "opt_i586_guprof.h"
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#include "opt_perfmon.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/gmon.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <machine/clock.h>
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#include <machine/perfmon.h>
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@ -175,14 +176,14 @@ cputime()
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u_char high, low;
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static u_int prev_count;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (cputime_clock == CPUTIME_CLOCK_I586_CTR) {
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count = (u_int)rdtsc();
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delta = (int)(count - prev_count);
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prev_count = count;
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return (delta);
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}
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#ifdef I586_PMC_GUPROF
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
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/*
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* XXX permon_read() should be inlined so that the
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@ -196,8 +197,8 @@ cputime()
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prev_count = count;
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return (delta);
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}
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#endif /* I586_PMC_GUPROF */
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#endif /* I586_CPU or I686_CPU */
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#endif /* PERFMON && I586_PMC_GUPROF */
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#endif /* (I586_CPU || I686_CPU) && !SMP */
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/*
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* Read the current value of the 8254 timer counter 0.
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@ -223,6 +224,49 @@ cputime()
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return (delta);
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}
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static int
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sysctl_machdep_cputime_clock SYSCTL_HANDLER_ARGS
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{
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int clock;
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int event;
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int error;
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struct pmc pmc;
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clock = cputime_clock;
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (clock == CPUTIME_CLOCK_I586_PMC) {
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pmc.pmc_val = cputime_clock_pmc_conf;
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clock += pmc.pmc_event;
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}
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#endif
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error = sysctl_handle_opaque(oidp, &clock, sizeof clock, req);
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if (error == 0 && req->newptr != NULL) {
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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if (clock >= CPUTIME_CLOCK_I586_PMC) {
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event = clock - CPUTIME_CLOCK_I586_PMC;
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if (event >= 256)
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return (EINVAL);
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pmc.pmc_num = 0;
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pmc.pmc_event = event;
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pmc.pmc_unit = 0;
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pmc.pmc_flags = PMCF_E | PMCF_OS | PMCF_USR;
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pmc.pmc_mask = 0;
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cputime_clock_pmc_conf = pmc.pmc_val;
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cputime_clock = CPUTIME_CLOCK_I586_PMC;
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} else
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#endif
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{
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if (clock < 0 || clock >= CPUTIME_CLOCK_I586_PMC)
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return (EINVAL);
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cputime_clock = clock;
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}
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}
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return (error);
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}
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SYSCTL_PROC(_machdep, OID_AUTO, cputime_clock, CTLTYPE_INT | CTLFLAG_RW,
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0, sizeof(u_int), sysctl_machdep_cputime_clock, "I", "");
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/*
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* The start and stop routines need not be here since we turn off profiling
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* before calling them. They are here for convenience.
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@ -234,16 +278,16 @@ startguprof(gp)
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{
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if (cputime_clock == CPUTIME_CLOCK_UNINITIALIZED) {
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cputime_clock = CPUTIME_CLOCK_I8254;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (i586_ctr_freq != 0)
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cputime_clock = CPUTIME_CLOCK_I586_CTR;
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#endif
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}
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gp->profrate = timer_freq << CPUTIME_CLOCK_I8254_SHIFT;
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#if defined(I586_CPU) || defined(I686_CPU)
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#if (defined(I586_CPU) || defined(I686_CPU)) && !defined(SMP)
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if (cputime_clock == CPUTIME_CLOCK_I586_CTR)
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gp->profrate = i586_ctr_freq;
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#ifdef I586_PMC_GUPROF
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#if defined(PERFMON) && defined(I586_PMC_GUPROF)
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else if (cputime_clock == CPUTIME_CLOCK_I586_PMC) {
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if (perfmon_avail() &&
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perfmon_setup(0, cputime_clock_pmc_conf) == 0) {
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@ -268,8 +312,8 @@ startguprof(gp)
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}
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}
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}
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#endif /* I586_PMC_GUPROF */
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#endif /* I586_CPU or I686_CPU */
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#endif /* PERFMON && I586_PMC_GUPROF */
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#endif /* (I586_CPU || I686_CPU) && !SMP */
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cputime_bias = 0;
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cputime();
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}
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