1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2008-2009, Intel Corporation.
23 * All Rights Reserved.
24 */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <memory.h>
29 #include <string.h>
30 #include <procfs.h>
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34 #include <limits.h>
35 #include <unistd.h>
36
37 #include "latencytop.h"
38
39 static GHashTable *proc_table = NULL; /* pid -> char * */
40 static GHashTable *klog_table = NULL; /* char * -> uint64_t total */
41 static char klog_filename[PATH_MAX] = DEFAULT_KLOG_FILE;
42 static int klog_level = LT_KLOG_LEVEL_NONE;
43
44 static void
45 print_proc(void *key, const char *args, FILE *fp)
46 {
47 (void) fprintf(fp, "%-8ld \"%s\"\n", (long)key, args);
48 }
49
50 static void
51 print_stat(const char *key, lt_stat_data_t *log, FILE *fp)
52 {
53 (void) fprintf(fp, "%lld, %lld, %lld, %s\n",
54 (long long)log->lt_s_total,
55 (long long)log->lt_s_count,
56 (long long)log->lt_s_max,
57 key);
58 }
59
60 /*
61 * Initialization for kernel logging.
62 */
63 void
64 lt_klog_init(void)
65 {
66 if (klog_table != NULL || proc_table != NULL) {
67 return;
68 }
69
70 klog_table = g_hash_table_new_full(g_str_hash, g_str_equal,
71 (GDestroyNotify)free, (GDestroyNotify)free);
72 lt_check_null(klog_table);
73
74 proc_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
75 NULL, (GDestroyNotify)free);
76 lt_check_null(proc_table);
77 }
78
79 /*
80 * Set log file path.
81 */
82 int
83 lt_klog_set_log_file(const char *filename)
84 {
85 FILE *fp;
86 int file_exist;
87
88 g_assert(strlen(filename) < sizeof (klog_filename));
89
90 file_exist = lt_file_exist(filename);
91 /* Test if we can write to the file */
92 fp = fopen(filename, "a");
93
94 if (fp == NULL) {
95 return (-2);
96 }
97
98 (void) fclose(fp);
99 /* Don't leave empty file around */
100 if (!file_exist) {
101 (void) unlink(filename);
102 }
103
104 (void) strncpy(klog_filename, filename,
105 sizeof (klog_filename));
106
107 return (0);
108 }
109
110 /*
111 * Set log level.
112 */
113 int
114 lt_klog_set_log_level(int level)
115 {
116 if (level < 0 || level > (int)LT_KLOG_LEVEL_ALL) {
117 return (-1);
118 }
119
120 klog_level = level;
121
122 return (0);
123 }
124
125 /*
126 * Write content to log file.
127 */
128 void
129 lt_klog_write(void)
130 {
131 FILE *fp;
132 char buffer[32];
133
134 if (klog_level == LT_KLOG_LEVEL_NONE) {
135 return;
136 }
137
138 g_assert(klog_table != NULL && proc_table != NULL);
139 fp = fopen(klog_filename, "a");
140
141 if (fp == NULL) {
142 return;
143 }
144
145 lt_time_str(buffer, sizeof (buffer));
146
147 (void) fprintf(fp, "# Log generated at %s by %s\n", buffer, TITLE);
148 (void) fprintf(fp, "# List of processes\n");
149 (void) fprintf(fp, "PID, CMD\n");
150 g_hash_table_foreach(proc_table, (GHFunc)print_proc, fp);
151
152 (void) fprintf(fp, "# Statistics\n");
153 (void) fprintf(fp, "TOTAL, COUNT, MAX, PID, KSTACK\n");
154 g_hash_table_foreach(klog_table, (GHFunc)print_stat, fp);
155
156 (void) fclose(fp);
157 }
158
159 /*
160 * Clean up. It flushes all log content in memory to log file.
161 */
162 void
163 lt_klog_deinit(void)
164 {
165 if (klog_table != NULL) {
166 g_hash_table_destroy(klog_table);
167 klog_table = NULL;
168 }
169
170 if (proc_table != NULL) {
171 g_hash_table_destroy(proc_table);
172 proc_table = NULL;
173 }
174 }
175
176 /*
177 * Write a kernel stack and its statistics to log file. Only "total" will
178 * be logged, others are internally discarded.
179 */
180 /* ARGSUSED */
181 void
182 lt_klog_log(int level, pid_t pid, char *stack,
183 lt_stat_type_t type, uint64_t value)
184 {
185 lt_stat_data_t *entry = NULL;
186 char *psargs;
187 char *str;
188 int str_len;
189
190 if ((level & klog_level) == 0) {
191 return;
192 }
193
194 g_assert(klog_table != NULL && proc_table != NULL);
195 psargs = (char *)g_hash_table_lookup(proc_table,
196 LT_INT_TO_POINTER(pid));
197
198 if (psargs == NULL) {
199 psargs = lt_get_proc_field(pid, LT_FIELD_PSARGS);
200
201 if (psargs == NULL) {
202 psargs = lt_get_proc_field(pid, LT_FIELD_FNAME);
203 }
204
205 if (psargs == NULL) {
206 return;
207 }
208
209 g_hash_table_insert(proc_table,
210 LT_INT_TO_POINTER(pid), psargs);
211 }
212
213 str_len = strlen(stack) + 20;
214 str = lt_malloc(str_len);
215 (void) snprintf(str, str_len, "%ld, \"%s\"", pid, stack);
216 entry = (lt_stat_data_t *)g_hash_table_lookup(klog_table, str);
217
218 if (entry == NULL) {
219 entry = (lt_stat_data_t *)lt_zalloc(sizeof (lt_stat_data_t));
220 g_hash_table_insert(klog_table, str, entry);
221 } else {
222 free(str);
223 }
224
225 lt_update_stat_value(entry, type, value);
226 }