clock_impl.h revision d3d50737e566cade9a08d73d2af95105ac7cd960
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * CDDL HEADER START
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d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Use is subject to license terms.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Default clock rate in Hz.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Thresholds over which we switch between event and cyclic driven lbolt. The
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * current default values were derived experimentally and will keep the
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * system on event driven mode when idle and respond to activity around the
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * lbolt DDI functions by switching to cyclic mode.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * Both lbolt_cpu_t and lbolt_info_t are cache line sized and aligned,
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * please take that in consideration if modifying these.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanonitypedef struct lbolt_cpu {
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbc_counter; /* number of calls to the DDI lbolt routines */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbc_cnt_start; /* beggining of the cnt interval (in ticks) */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni char lbc_pad[CPU_CACHE_COHERENCE_SIZE - (2 * sizeof (int64_t))];
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanonitypedef struct lbolt_info {
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni cyclic_id_t lbi_cyclic_id; /* lbolt's cyclic id */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_internal; /* lbolt source when on cyclic mode */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_debug_time; /* time spent in the debugger */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_debug_ts; /* last time we dropped into kmdb */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_thresh_calls; /* max calls per interval */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_thresh_interval; /* interval window for the # of calls */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni uint32_t lbi_token; /* synchronize cyclic mode switch */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni boolean_t lbi_cyc_deactivate; /* lbolt_cyclic self deactivation */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni int64_t lbi_cyc_deac_start; /* deactivation interval */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoniextern uint_t lbolt_ev_to_cyclic(caddr_t, caddr_t);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoniextern void lbolt_softint_add(void);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoniextern void lbolt_softint_post(void);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoniextern void lbolt_debug_entry(void);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoniextern void lbolt_debug_return(void);
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * LBOLT_WAITFREE provides a non-waiting version of lbolt.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni (lb_info->lbi_internal - lb_info->lbi_debug_time))
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * LBOLT_FASTPATH should *only* be used where the cost of calling
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * ddi_get_lbolt() affects performance. This is currently only used by the
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * TCP/IP code and will be removed once it's no longer required.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni (lbolt_hybrid == lbolt_event_driven ? ddi_get_lbolt() : \
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni (clock_t)(lb_info->lbi_internal - lb_info->lbi_debug_time))
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * LBOLT_NO_ACCOUNT is used by lbolt consumers who fire at a periodic rate,
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * such as clock(), for which the lbolt usage statistics are not updated.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * This is specially important for consumers whose rate may be modified by
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * the user, resulting in an unaccounted for increase in activity around the
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni * lbolt routines that could cause a mode switch.
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni ((gethrtime()/nsec_per_tick) - lb_info->lbi_debug_time) : \
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni (lb_info->lbi_internal - lb_info->lbi_debug_time))
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni#endif /* _KERNEL || _KMEMUSER */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni#endif /* _SYS_CLOCK_IMPL_H */