1 /* $OpenBSD: rf_acctrace.c,v 1.4 2002/12/16 07:01:02 tdeval Exp $ */
2 /* $NetBSD: rf_acctrace.c,v 1.4 1999/08/13 03:41:52 oster Exp $ */
3
4 /*
5 * Copyright (c) 1995 Carnegie-Mellon University.
6 * All rights reserved.
7 *
8 * Author: Mark Holland
9 *
10 * Permission to use, copy, modify and distribute this software and
11 * its documentation is hereby granted, provided that both the copyright
12 * notice and this permission notice appear in all copies of the
13 * software, derivative works or modified versions, and any portions
14 * thereof, and that both notices appear in supporting documentation.
15 *
16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
19 *
20 * Carnegie Mellon requests users of this software to return to
21 *
22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
23 * School of Computer Science
24 * Carnegie Mellon University
25 * Pittsburgh PA 15213-3890
26 *
27 * any improvements or extensions that they make and grant Carnegie the
28 * rights to redistribute these changes.
29 */
30
31 /*****************************************************************************
32 *
33 * acctrace.c -- Code to support collecting information about each access.
34 *
35 *****************************************************************************/
36
37
38 #include <sys/stat.h>
39 #include <sys/types.h>
40
41 #include "rf_threadstuff.h"
42 #include "rf_types.h"
43 #include "rf_debugMem.h"
44 #include "rf_acctrace.h"
45 #include "rf_general.h"
46 #include "rf_raid.h"
47 #include "rf_etimer.h"
48 #include "rf_hist.h"
49 #include "rf_shutdown.h"
50
51 static long numTracesSoFar;
52 static int accessTraceBufCount = 0;
53 static RF_AccTraceEntry_t *access_tracebuf;
54 static long traceCount;
55
56 int rf_stopCollectingTraces;
57 RF_DECLARE_MUTEX(rf_tracing_mutex);
58 int rf_trace_fd;
59
60 void rf_ShutdownAccessTrace(void *);
61
62 void
rf_ShutdownAccessTrace(void * ignored)63 rf_ShutdownAccessTrace(void *ignored)
64 {
65 if (rf_accessTraceBufSize) {
66 if (accessTraceBufCount)
67 rf_FlushAccessTraceBuf();
68 RF_Free(access_tracebuf, rf_accessTraceBufSize *
69 sizeof(RF_AccTraceEntry_t));
70 }
71 rf_mutex_destroy(&rf_tracing_mutex);
72 }
73
74 int
rf_ConfigureAccessTrace(RF_ShutdownList_t ** listp)75 rf_ConfigureAccessTrace(RF_ShutdownList_t **listp)
76 {
77 int rc;
78
79 numTracesSoFar = accessTraceBufCount = rf_stopCollectingTraces = 0;
80 if (rf_accessTraceBufSize) {
81 RF_Malloc(access_tracebuf, rf_accessTraceBufSize *
82 sizeof(RF_AccTraceEntry_t), (RF_AccTraceEntry_t *));
83 accessTraceBufCount = 0;
84 }
85 traceCount = 0;
86 numTracesSoFar = 0;
87 rc = rf_mutex_init(&rf_tracing_mutex);
88 if (rc) {
89 RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d.\n",
90 __FILE__, __LINE__, rc);
91 }
92 rc = rf_ShutdownCreate(listp, rf_ShutdownAccessTrace, NULL);
93 if (rc) {
94 RF_ERRORMSG3("Unable to add to shutdown list file %s line %d"
95 " rc=%d.\n", __FILE__, __LINE__, rc);
96 if (rf_accessTraceBufSize) {
97 RF_Free(access_tracebuf, rf_accessTraceBufSize *
98 sizeof(RF_AccTraceEntry_t));
99 rf_mutex_destroy(&rf_tracing_mutex);
100 }
101 }
102 return (rc);
103 }
104
105 /*
106 * Install a trace record. Cause a flush to disk or to the trace collector
107 * daemon if the trace buffer is at least 1/2 full.
108 */
109 void
rf_LogTraceRec(RF_Raid_t * raid,RF_AccTraceEntry_t * rec)110 rf_LogTraceRec(RF_Raid_t *raid, RF_AccTraceEntry_t *rec)
111 {
112 RF_AccTotals_t *acc = &raid->acc_totals;
113 #if 0
114 RF_Etimer_t timer;
115 int i, n;
116 #endif
117
118 if (rf_stopCollectingTraces || ((rf_maxNumTraces >= 0) &&
119 (numTracesSoFar >= rf_maxNumTraces)))
120 return;
121
122 /* Update AccTotals for this device. */
123 if (!raid->keep_acc_totals)
124 return;
125
126 acc->num_log_ents++;
127 if (rec->reconacc) {
128 acc->recon_start_to_fetch_us +=
129 rec->specific.recon.recon_start_to_fetch_us;
130 acc->recon_fetch_to_return_us +=
131 rec->specific.recon.recon_fetch_to_return_us;
132 acc->recon_return_to_submit_us +=
133 rec->specific.recon.recon_return_to_submit_us;
134 acc->recon_num_phys_ios += rec->num_phys_ios;
135 acc->recon_phys_io_us += rec->phys_io_us;
136 acc->recon_diskwait_us += rec->diskwait_us;
137 acc->recon_reccount++;
138 } else {
139 RF_HIST_ADD(acc->tot_hist, rec->total_us);
140 RF_HIST_ADD(acc->dw_hist, rec->diskwait_us);
141 /*
142 * Count of physical IOs that are too big. (often due to
143 * thermal recalibration)
144 *
145 * If bigvals > 0, you should probably ignore this data set.
146 */
147 if (rec->diskwait_us > 100000)
148 acc->bigvals++;
149
150 acc->total_us += rec->total_us;
151 acc->suspend_ovhd_us += rec->specific.user.suspend_ovhd_us;
152 acc->map_us += rec->specific.user.map_us;
153 acc->lock_us += rec->specific.user.lock_us;
154 acc->dag_create_us += rec->specific.user.dag_create_us;
155 acc->dag_retry_us += rec->specific.user.dag_retry_us;
156 acc->exec_us += rec->specific.user.exec_us;
157 acc->cleanup_us += rec->specific.user.cleanup_us;
158 acc->exec_engine_us += rec->specific.user.exec_engine_us;
159 acc->xor_us += rec->xor_us;
160 acc->q_us += rec->q_us;
161 acc->plog_us += rec->plog_us;
162 acc->diskqueue_us += rec->diskqueue_us;
163 acc->diskwait_us += rec->diskwait_us;
164 acc->num_phys_ios += rec->num_phys_ios;
165 acc->phys_io_us = rec->phys_io_us;
166 acc->user_reccount++;
167 }
168 }
169
170
171 /*
172 * Assumes the tracing mutex is locked at entry. In order to allow this to
173 * be called from interrupt context, we don't do any copyouts here, but rather
174 * just wake the trace buffer collector thread.
175 */
176 void
rf_FlushAccessTraceBuf(void)177 rf_FlushAccessTraceBuf(void)
178 {
179 accessTraceBufCount = 0;
180 }
181