1 files changed, 125 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/clock_impl.h b/usr/src/uts/common/sys/clock_impl.h
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+++ b/usr/src/uts/common/sys/clock_impl.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_CLOCK_IMPL_H
+#define	_SYS_CLOCK_IMPL_H
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#if (defined(_KERNEL) || defined(_KMEMUSER))
+#include <sys/types.h>
+#include <sys/cpuvar.h>
+#include <sys/cyclic.h>
+#include <sys/time.h>
+
+/*
+ * Default clock rate in Hz.
+ */
+#define	HZ_DEFAULT		100
+
+/*
+ * Thresholds over which we switch between event and cyclic driven lbolt. The
+ * current default values were derived experimentally and will keep the
+ * system on event driven mode when idle and respond to activity around the
+ * lbolt DDI functions by switching to cyclic mode.
+ */
+#define	LBOLT_THRESH_CALLS		(75)
+#define	LBOLT_THRESH_INTERVAL		(1)
+
+/*
+ * Both lbolt_cpu_t and lbolt_info_t are cache line sized and aligned,
+ * please take that in consideration if modifying these.
+ */
+typedef struct lbolt_cpu {
+	int64_t lbc_counter;	/* number of calls to the DDI lbolt routines */
+	int64_t lbc_cnt_start;	/* beggining of the cnt interval (in ticks) */
+	char lbc_pad[CPU_CACHE_COHERENCE_SIZE - (2 * sizeof (int64_t))];
+} lbolt_cpu_t;
+
+typedef struct lbolt_info {
+	cyclic_id_t lbi_cyclic_id;	/* lbolt's cyclic id */
+	int64_t lbi_internal;		/* lbolt source when on cyclic mode */
+	int64_t lbi_debug_time;		/* time spent in the debugger */
+	int64_t lbi_debug_ts;		/* last time we dropped into kmdb */
+	int64_t lbi_thresh_calls;	/* max calls per interval */
+	int64_t lbi_thresh_interval;	/* interval window for the # of calls */
+	uint32_t lbi_token;		/* synchronize cyclic mode switch */
+	boolean_t lbi_cyc_deactivate;	/* lbolt_cyclic self deactivation */
+	int64_t lbi_cyc_deac_start;	/* deactivation interval */
+} lbolt_info_t;
+
+extern int64_t lbolt_event_driven(void);
+extern int64_t lbolt_cyclic_driven(void);
+extern int64_t (*lbolt_hybrid)(void);
+extern uint_t lbolt_ev_to_cyclic(caddr_t, caddr_t);
+
+extern void lbolt_softint_add(void);
+extern void lbolt_softint_post(void);
+
+extern void lbolt_debug_entry(void);
+extern void lbolt_debug_return(void);
+
+extern lbolt_info_t *lb_info;
+
+/*
+ * LBOLT_WAITFREE provides a non-waiting version of lbolt.
+ */
+#define	LBOLT_WAITFREE							\
+	(lbolt_hybrid == lbolt_event_driven ?                           \
+	    ((gethrtime_waitfree()/nsec_per_tick) -			\
+	    lb_info->lbi_debug_time) :					\
+	    (lb_info->lbi_internal - lb_info->lbi_debug_time))
+
+/*
+ * LBOLT_FASTPATH should *only* be used where the cost of calling
+ * ddi_get_lbolt() affects performance. This is currently only used by the
+ * TCP/IP code and will be removed once it's no longer required.
+ */
+#define	LBOLT_FASTPATH							\
+	(lbolt_hybrid == lbolt_event_driven ? ddi_get_lbolt() :		\
+	    (clock_t)(lb_info->lbi_internal - lb_info->lbi_debug_time))
+
+/*
+ * LBOLT_NO_ACCOUNT is used by lbolt consumers who fire at a periodic rate,
+ * such as clock(), for which the lbolt usage statistics are not updated.
+ * This is specially important for consumers whose rate may be modified by
+ * the user, resulting in an unaccounted for increase in activity around the
+ * lbolt routines that could cause a mode switch.
+ */
+#define	LBOLT_NO_ACCOUNT						\
+	(lbolt_hybrid == lbolt_event_driven ?				\
+	    ((gethrtime()/nsec_per_tick) - lb_info->lbi_debug_time) :	\
+	    (lb_info->lbi_internal - lb_info->lbi_debug_time))
+
+#endif	/* _KERNEL || _KMEMUSER */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_CLOCK_IMPL_H */