/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <kern/assert.h>
#include <kern/processor.h>
#include <kern/thread.h>
+#if CONFIG_TELEMETRY
+#include <kern/telemetry.h>
+#endif
uint32_t avenrun[3] = {0, 0, 0};
uint32_t mach_factor[3] = {0, 0, 0};
+#if defined(CONFIG_SCHED_TRADITIONAL)
/*
* Values are scaled by LOAD_SCALE, defined in processor_info.h
*/
#undef base
#undef frac
+#endif /* CONFIG_SCHED_TRADITIONAL */
+
static unsigned int sched_nrun;
typedef void (*sched_avg_comp_t)(
void *param);
-#define SCHED_AVG_SECS(n) ((n) << SCHED_TICK_SHIFT)
-
static struct sched_average {
sched_avg_comp_t comp;
- void *param;
- int period;
- int tick;
+ void *param;
+ int period; /* in seconds */
+ uint64_t deadline;
} sched_average[] = {
- { compute_averunnable, &sched_nrun, SCHED_AVG_SECS(5), 0 },
- { compute_stack_target, NULL, SCHED_AVG_SECS(5), 1 },
+ { compute_averunnable, &sched_nrun, 5, 0 },
+ { compute_stack_target, NULL, 5, 1 },
+ { compute_memory_pressure, NULL, 1, 0 },
+ { compute_zone_gc_throttle, NULL, 60, 0 },
+ { compute_pageout_gc_throttle, NULL, 1, 0 },
+ { compute_pmap_gc_throttle, NULL, 60, 0 },
+#if CONFIG_TELEMETRY
+ { compute_telemetry, NULL, 1, 0 },
+#endif
{ NULL, NULL, 0, 0 }
};
typedef struct sched_average *sched_average_t;
+/* The "stdelta" parameter represents the number of scheduler maintenance
+ * "ticks" that have elapsed since the last invocation, subject to
+ * integer division imprecision.
+ */
+
void
-compute_averages(void)
+compute_averages(uint64_t stdelta)
{
- register processor_set_t pset = &default_pset;
- register int ncpus;
- register int nthreads, nshared;
- sched_average_t avg;
- register uint32_t factor_now = 0;
- register uint32_t average_now = 0;
- register uint32_t load_now = 0;
-
- if ((ncpus = pset->processor_count) > 0) {
- /*
- * Retrieve counts, ignoring
- * the current thread.
- */
- nthreads = pset->run_count - 1;
- nshared = pset->share_count;
-
- /*
- * Load average and mach factor calculations for
- * those which ask about these things.
- */
- average_now = nthreads * LOAD_SCALE;
-
- if (nthreads > ncpus)
- factor_now = (ncpus * LOAD_SCALE) / (nthreads + 1);
+ int ncpus, nthreads, nshared, nbackground, nshared_non_bg;
+ uint32_t factor_now, average_now, load_now = 0, background_load_now = 0, combined_fgbg_load_now = 0;
+ sched_average_t avg;
+ uint64_t abstime, index;
+
+ /*
+ * Retrieve counts, ignoring
+ * the current thread.
+ */
+ ncpus = processor_avail_count;
+ nthreads = sched_run_count - 1;
+ nshared = sched_share_count;
+ nbackground = sched_background_count;
+
+ /*
+ * Load average and mach factor calculations for
+ * those which ask about these things.
+ */
+ average_now = nthreads * LOAD_SCALE;
+
+ if (nthreads > ncpus)
+ factor_now = (ncpus * LOAD_SCALE) / (nthreads + 1);
+ else
+ factor_now = (ncpus - nthreads) * LOAD_SCALE;
+
+ /* For those statistics that formerly relied on being recomputed
+ * on timer ticks, advance by the approximate number of corresponding
+ * elapsed intervals, thus compensating for potential idle intervals.
+ */
+ for (index = 0; index < stdelta; index++) {
+ sched_mach_factor = ((sched_mach_factor << 2) + factor_now) / 5;
+ sched_load_average = ((sched_load_average << 2) + average_now) / 5;
+ }
+ /*
+ * Compute the timeshare priority conversion factor based on loading.
+ * Because our counters may be incremented and accessed
+ * concurrently with respect to each other, we may have
+ * windows where the invariant nthreads >= nshared >= nbackground
+ * is broken, so truncate values in these cases.
+ */
+
+ if (nshared > nthreads)
+ nshared = nthreads;
+
+ if (nbackground > nshared)
+ nbackground = nshared;
+
+ nshared_non_bg = nshared - nbackground;
+
+ if (nshared_non_bg > ncpus) {
+ if (ncpus > 1)
+ load_now = nshared_non_bg / ncpus;
else
- factor_now = (ncpus - nthreads) * LOAD_SCALE;
-
- pset->mach_factor = ((pset->mach_factor << 2) + factor_now) / 5;
- pset->load_average = ((pset->load_average << 2) + average_now) / 5;
-
- /*
- * Compute the timeshare priority
- * conversion factor based on loading.
- */
- if (nshared > nthreads)
- nshared = nthreads;
-
- if (nshared > ncpus) {
- if (ncpus > 1)
- load_now = nshared / ncpus;
- else
- load_now = nshared;
-
- if (load_now > NRQS - 1)
- load_now = NRQS - 1;
- }
+ load_now = nshared_non_bg;
- /*
- * The conversion factor consists of
- * two components: a fixed value based
- * on the absolute time unit, and a
- * dynamic portion based on loading.
- *
- * Zero loading results in a out of range
- * shift count. Accumulated usage is ignored
- * during conversion and new usage deltas
- * are discarded.
- */
- pset->pri_shift = sched_pri_shift - sched_load_shifts[load_now];
+ if (load_now > NRQS - 1)
+ load_now = NRQS - 1;
}
- else {
- pset->mach_factor = pset->load_average = 0;
- pset->pri_shift = INT8_MAX;
- nthreads = pset->run_count;
+
+ if (nbackground > ncpus) {
+ if (ncpus > 1)
+ background_load_now = nbackground / ncpus;
+ else
+ background_load_now = nbackground;
+
+ if (background_load_now > NRQS - 1)
+ background_load_now = NRQS - 1;
+ }
+
+ if (nshared > ncpus) {
+ if (ncpus > 1)
+ combined_fgbg_load_now = nshared / ncpus;
+ else
+ combined_fgbg_load_now = nshared;
+
+ if (combined_fgbg_load_now > NRQS - 1)
+ combined_fgbg_load_now = NRQS - 1;
}
/*
* Sample total running threads.
*/
sched_nrun = nthreads;
+
+#if defined(CONFIG_SCHED_TRADITIONAL)
+
+ /*
+ * The conversion factor consists of
+ * two components: a fixed value based
+ * on the absolute time unit, and a
+ * dynamic portion based on loading.
+ *
+ * Zero loading results in a out of range
+ * shift count. Accumulated usage is ignored
+ * during conversion and new usage deltas
+ * are discarded.
+ */
+ sched_pri_shift = sched_fixed_shift - sched_load_shifts[load_now];
+ sched_background_pri_shift = sched_fixed_shift - sched_load_shifts[background_load_now];
+ sched_combined_fgbg_pri_shift = sched_fixed_shift - sched_load_shifts[combined_fgbg_load_now];
/*
* Compute old-style Mach load averages.
*/
- {
+
+ for (index = 0; index < stdelta; index++) {
register int i;
for (i = 0; i < 3; i++) {
(average_now * (LOAD_SCALE - fract[i]))) / LOAD_SCALE;
}
}
+#endif /* CONFIG_SCHED_TRADITIONAL */
/*
* Compute averages in other components.
*/
+ abstime = mach_absolute_time();
for (avg = sched_average; avg->comp != NULL; ++avg) {
- if (++avg->tick >= avg->period) {
- (*avg->comp)(avg->param);
- avg->tick = 0;
+ if (abstime >= avg->deadline) {
+ uint64_t period_abs = (avg->period * sched_one_second_interval);
+ uint64_t ninvokes = 1;
+
+ ninvokes += (abstime - avg->deadline) / period_abs;
+ ninvokes = MIN(ninvokes, SCHED_TICK_MAX_DELTA);
+
+ for (index = 0; index < ninvokes; index++) {
+ (*avg->comp)(avg->param);
+ }
+ avg->deadline = abstime + period_abs;
}
}
}
projects / apple / xnu.git / blobdiff