205 lines
6.5 KiB
C
205 lines
6.5 KiB
C
/* $NetBSD: lockstat.h,v 1.4 2007/02/09 21:55:26 ad Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_LOCKSTAT_H_
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#define _SYS_LOCKSTAT_H_
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#ifdef _KERNEL_OPT
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#include <lockstat.h>
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#endif
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#include <sys/types.h>
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#include <sys/ioccom.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#if defined(_KERNEL) && defined(__HAVE_CPU_COUNTER)
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#include <machine/cpu_counter.h>
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#endif
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/*
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* Interface version. The interface is not designed to provide
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* compatibility across NetBSD releases.
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*/
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#define IOC_LOCKSTAT_GVERSION _IOR('L', 0, int)
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#define LS_VERSION 3
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/*
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* Enable request. We can limit tracing by the call site and by
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* the lock. We also specify the number of event buffers to
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* allocate up front, and what kind of events to track.
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*/
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#define IOC_LOCKSTAT_ENABLE _IOW('L', 1, lsenable_t)
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#define LE_CALLSITE 0x01 /* track call sites */
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#define LE_ONE_CALLSITE 0x02 /* specific call site */
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#define LE_ONE_LOCK 0x04 /* specific lock */
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typedef struct lsenable {
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uintptr_t le_csstart; /* callsite start */
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uintptr_t le_csend; /* callsite end */
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uintptr_t le_lockstart; /* lock address start */
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uintptr_t le_lockend; /* lock address end */
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uintptr_t le_nbufs; /* buffers to allocate, 0 = default */
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u_int le_flags; /* request flags */
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u_int le_mask; /* event mask (LB_*) */
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} lsenable_t;
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/*
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* Disable request.
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*/
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#define IOC_LOCKSTAT_DISABLE _IOR('L', 2, lsdisable_t)
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typedef struct lsdisable {
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size_t ld_size; /* buffer space allocated */
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struct timespec ld_time; /* time spent enabled */
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uint64_t ld_freq[64]; /* counter HZ by CPU number */
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} lsdisable_t;
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/*
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* Event buffers returned from reading from the devices.
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*/
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/*
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* Event types, for lockstat_event(). Stored in lb_flags but should be
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* meaningless to the consumer, also provided with the enable request
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* in le_mask.
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*/
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#define LB_SPIN 0x00000001
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#define LB_SLEEP1 0x00000002
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#define LB_SLEEP2 0x00000003
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#define LB_NEVENT 0x00000003
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#define LB_EVENT_MASK 0x000000ff
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/*
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* Lock types, the only part of lb_flags that should be inspected. Also
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* provided with the enable request in le_mask.
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*/
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#define LB_ADAPTIVE_MUTEX 0x00000100
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#define LB_SPIN_MUTEX 0x00000200
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#define LB_RWLOCK 0x00000300
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#define LB_LOCKMGR 0x00000400
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#define LB_KERNEL_LOCK 0x00000500
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#define LB_MISC 0x00000600
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#define LB_NLOCK 0x00000600
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#define LB_LOCK_MASK 0x0000ff00
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#define LB_LOCK_SHIFT 8
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typedef struct lsbuf {
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union {
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LIST_ENTRY(lsbuf) list;
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SLIST_ENTRY(lsbuf) slist;
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TAILQ_ENTRY(lsbuf) tailq;
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} lb_chain;
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uintptr_t lb_lock; /* lock address */
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uintptr_t lb_callsite; /* call site */
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uint64_t lb_times[LB_NEVENT]; /* cumulative times */
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uint32_t lb_counts[LB_NEVENT]; /* count of events */
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uint16_t lb_flags; /* lock type */
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uint16_t lb_cpu; /* CPU number */
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} lsbuf_t;
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/*
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* Tracing stubs used by lock providers, e.g. lockmgr().
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*/
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#if defined(_KERNEL) && defined(__HAVE_CPU_COUNTER) && NLOCKSTAT > 0
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#define LOCKSTAT_EVENT(flag, lock, type, count, time) \
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do { \
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if (__predict_false(flag)) \
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lockstat_event((uintptr_t)(lock), \
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(uintptr_t)__builtin_return_address(0), \
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(type), (count), (time)); \
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} while (/* CONSTCOND */ 0);
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#define LOCKSTAT_EVENT_RA(flag, lock, type, count, time, ra) \
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do { \
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if (__predict_false(flag)) \
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lockstat_event((uintptr_t)(lock), (uintptr_t)ra, \
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(type), (count), (time)); \
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} while (/* CONSTCOND */ 0);
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#define LOCKSTAT_TIMER(name) uint64_t name = 0
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#define LOCKSTAT_COUNTER(name) uint64_t name = 0
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#define LOCKSTAT_FLAG(name) int name
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#define LOCKSTAT_ENTER(name) name = lockstat_enabled
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#define LOCKSTAT_EXIT(name)
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#define LOCKSTAT_START_TIMER(flag, name) \
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do { \
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if (__predict_false(flag)) \
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(name) -= cpu_counter(); \
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} while (/* CONSTCOND */ 0)
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#define LOCKSTAT_STOP_TIMER(flag, name) \
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do { \
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if (__predict_false(flag)) \
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(name) += cpu_counter(); \
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} while (/* CONSTCOND */ 0)
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#define LOCKSTAT_COUNT(name, inc) \
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do { \
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(name) += (inc); \
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} while (/* CONSTCOND */ 0)
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void lockstat_event(uintptr_t, uintptr_t, u_int, u_int, uint64_t);
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extern volatile u_int lockstat_enabled;
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#else
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#define LOCKSTAT_FLAG(name) /* nothing */
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#define LOCKSTAT_ENTER(name) /* nothing */
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#define LOCKSTAT_EXIT(name) /* nothing */
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#define LOCKSTAT_EVENT(flag, lock, type, count, time) /* nothing */
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#define LOCKSTAT_EVENT_RA(flag, lock, type, count, time, ra) /* nothing */
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#define LOCKSTAT_TIMER(void) /* nothing */
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#define LOCKSTAT_COUNTER(void) /* nothing */
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#define LOCKSTAT_START_TIMER(flag, void) /* nothing */
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#define LOCKSTAT_STOP_TIMER(flag, void) /* nothing */
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#define LOCKSTAT_COUNT(name, int) /* nothing */
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#endif
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#endif /* _SYS_LOCKSTAT_H_ */
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