blob: 5c2965562c5d7fe87bb08d61a1e8751b70bf01b5 [file] [log] [blame]
Ingo Molnar07800602009-04-20 15:00:56 +02001/*
Ingo Molnarbf9e1872009-06-02 23:37:05 +02002 * builtin-top.c
3 *
4 * Builtin top command: Display a continuously updated profile of
5 * any workload, CPU or specific PID.
6 *
7 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
8 *
9 * Improvements and fixes by:
10 *
11 * Arjan van de Ven <arjan@linux.intel.com>
12 * Yanmin Zhang <yanmin.zhang@intel.com>
13 * Wu Fengguang <fengguang.wu@intel.com>
14 * Mike Galbraith <efault@gmx.de>
15 * Paul Mackerras <paulus@samba.org>
16 *
17 * Released under the GPL v2. (and only v2, not any later version)
Ingo Molnar07800602009-04-20 15:00:56 +020018 */
Ingo Molnarbf9e1872009-06-02 23:37:05 +020019#include "builtin.h"
Ingo Molnar07800602009-04-20 15:00:56 +020020
Peter Zijlstra1a482f32009-05-23 18:28:58 +020021#include "perf.h"
Ingo Molnarbf9e1872009-06-02 23:37:05 +020022
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -030023#include "util/symbol.h"
Ingo Molnar8fc03212009-06-04 15:19:47 +020024#include "util/color.h"
Ingo Molnar148be2c2009-04-27 08:02:14 +020025#include "util/util.h"
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -030026#include "util/rbtree.h"
Ingo Molnarb456bae2009-05-26 09:17:18 +020027#include "util/parse-options.h"
28#include "util/parse-events.h"
Ingo Molnar07800602009-04-20 15:00:56 +020029
Ingo Molnar07800602009-04-20 15:00:56 +020030#include <assert.h>
31#include <fcntl.h>
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020032
Ingo Molnar07800602009-04-20 15:00:56 +020033#include <stdio.h>
Ingo Molnar0e9b20b2009-05-26 09:17:18 +020034
Ingo Molnar07800602009-04-20 15:00:56 +020035#include <errno.h>
Ingo Molnar07800602009-04-20 15:00:56 +020036#include <time.h>
37#include <sched.h>
38#include <pthread.h>
39
40#include <sys/syscall.h>
41#include <sys/ioctl.h>
42#include <sys/poll.h>
43#include <sys/prctl.h>
44#include <sys/wait.h>
45#include <sys/uio.h>
46#include <sys/mman.h>
47
48#include <linux/unistd.h>
49#include <linux/types.h>
50
Ingo Molnara21ca2c2009-06-06 09:58:57 +020051static int fd[MAX_NR_CPUS][MAX_COUNTERS];
52
Ingo Molnar07800602009-04-20 15:00:56 +020053static int system_wide = 0;
54
Ingo Molnara21ca2c2009-06-06 09:58:57 +020055static int default_interval = 100000;
Ingo Molnar07800602009-04-20 15:00:56 +020056
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100057static u64 count_filter = 5;
Ingo Molnar6e53cdf2009-06-04 08:53:05 +020058static int print_entries = 15;
Ingo Molnar07800602009-04-20 15:00:56 +020059
Ingo Molnar6e53cdf2009-06-04 08:53:05 +020060static int target_pid = -1;
Ingo Molnar07800602009-04-20 15:00:56 +020061static int profile_cpu = -1;
62static int nr_cpus = 0;
Ingo Molnar07800602009-04-20 15:00:56 +020063static unsigned int realtime_prio = 0;
64static int group = 0;
65static unsigned int page_size;
Ingo Molnarcf1f4572009-06-05 13:27:02 +020066static unsigned int mmap_pages = 16;
67static int freq = 0;
Ingo Molnar3da297a2009-06-07 17:39:02 +020068static int verbose = 0;
Ingo Molnar07800602009-04-20 15:00:56 +020069
Ingo Molnar07800602009-04-20 15:00:56 +020070static char *sym_filter;
71static unsigned long filter_start;
72static unsigned long filter_end;
73
74static int delay_secs = 2;
75static int zero;
76static int dump_symtab;
77
Ingo Molnar07800602009-04-20 15:00:56 +020078/*
79 * Symbols
80 */
81
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100082static u64 min_ip;
83static u64 max_ip = -1ll;
Ingo Molnar07800602009-04-20 15:00:56 +020084
85struct sym_entry {
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -030086 struct rb_node rb_node;
87 struct list_head node;
Ingo Molnar07800602009-04-20 15:00:56 +020088 unsigned long count[MAX_COUNTERS];
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -030089 unsigned long snap_count;
90 double weight;
Ingo Molnar07800602009-04-20 15:00:56 +020091 int skip;
Ingo Molnar07800602009-04-20 15:00:56 +020092};
93
Ingo Molnar07800602009-04-20 15:00:56 +020094struct sym_entry *sym_filter_entry;
95
Ingo Molnara21ca2c2009-06-06 09:58:57 +020096struct dso *kernel_dso;
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -030097
98/*
99 * Symbols will be added here in record_ip and will get out
100 * after decayed.
101 */
102static LIST_HEAD(active_symbols);
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300103static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
Ingo Molnar07800602009-04-20 15:00:56 +0200104
Ingo Molnar07800602009-04-20 15:00:56 +0200105/*
106 * Ordering weight: count-1 * count-2 * ... / count-n
107 */
108static double sym_weight(const struct sym_entry *sym)
109{
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300110 double weight = sym->snap_count;
Ingo Molnar07800602009-04-20 15:00:56 +0200111 int counter;
112
Ingo Molnar07800602009-04-20 15:00:56 +0200113 for (counter = 1; counter < nr_counters-1; counter++)
114 weight *= sym->count[counter];
115
116 weight /= (sym->count[counter] + 1);
117
118 return weight;
119}
120
Ingo Molnar2debbc82009-06-05 14:29:10 +0200121static long samples;
122static long userspace_samples;
Ingo Molnar07800602009-04-20 15:00:56 +0200123static const char CONSOLE_CLEAR[] = "";
124
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300125static void __list_insert_active_sym(struct sym_entry *syme)
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300126{
127 list_add(&syme->node, &active_symbols);
128}
129
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300130static void list_remove_active_sym(struct sym_entry *syme)
131{
132 pthread_mutex_lock(&active_symbols_lock);
133 list_del_init(&syme->node);
134 pthread_mutex_unlock(&active_symbols_lock);
135}
136
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300137static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
138{
139 struct rb_node **p = &tree->rb_node;
140 struct rb_node *parent = NULL;
141 struct sym_entry *iter;
142
143 while (*p != NULL) {
144 parent = *p;
145 iter = rb_entry(parent, struct sym_entry, rb_node);
146
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300147 if (se->weight > iter->weight)
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300148 p = &(*p)->rb_left;
149 else
150 p = &(*p)->rb_right;
151 }
152
153 rb_link_node(&se->rb_node, parent, p);
154 rb_insert_color(&se->rb_node, tree);
155}
Ingo Molnar07800602009-04-20 15:00:56 +0200156
157static void print_sym_table(void)
158{
Ingo Molnar233f0b92009-06-03 21:48:40 +0200159 int printed = 0, j;
Ingo Molnar07800602009-04-20 15:00:56 +0200160 int counter;
Ingo Molnar2debbc82009-06-05 14:29:10 +0200161 float samples_per_sec = samples/delay_secs;
162 float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
163 float sum_ksamples = 0.0;
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300164 struct sym_entry *syme, *n;
165 struct rb_root tmp = RB_ROOT;
166 struct rb_node *nd;
Ingo Molnar07800602009-04-20 15:00:56 +0200167
Ingo Molnar2debbc82009-06-05 14:29:10 +0200168 samples = userspace_samples = 0;
Ingo Molnar07800602009-04-20 15:00:56 +0200169
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300170 /* Sort the active symbols */
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300171 pthread_mutex_lock(&active_symbols_lock);
172 syme = list_entry(active_symbols.next, struct sym_entry, node);
173 pthread_mutex_unlock(&active_symbols_lock);
174
175 list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
176 syme->snap_count = syme->count[0];
177 if (syme->snap_count != 0) {
178 syme->weight = sym_weight(syme);
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300179 rb_insert_active_sym(&tmp, syme);
Ingo Molnar2debbc82009-06-05 14:29:10 +0200180 sum_ksamples += syme->snap_count;
Mike Galbraithd94b9432009-05-25 09:57:56 +0200181
182 for (j = 0; j < nr_counters; j++)
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300183 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
184 } else
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300185 list_remove_active_sym(syme);
Mike Galbraithd94b9432009-05-25 09:57:56 +0200186 }
187
Frederic Weisbecker0f5486b2009-06-04 20:48:04 +0200188 puts(CONSOLE_CLEAR);
Ingo Molnar07800602009-04-20 15:00:56 +0200189
190 printf(
191"------------------------------------------------------------------------------\n");
Ingo Molnarf2521b62009-06-03 19:17:25 +0200192 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
Ingo Molnar2debbc82009-06-05 14:29:10 +0200193 samples_per_sec,
194 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
Ingo Molnar07800602009-04-20 15:00:56 +0200195
Ingo Molnarcf1f4572009-06-05 13:27:02 +0200196 if (nr_counters == 1) {
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000197 printf("%Ld", (u64)attrs[0].sample_period);
Ingo Molnarcf1f4572009-06-05 13:27:02 +0200198 if (freq)
199 printf("Hz ");
200 else
201 printf(" ");
202 }
Ingo Molnar07800602009-04-20 15:00:56 +0200203
204 for (counter = 0; counter < nr_counters; counter++) {
205 if (counter)
206 printf("/");
207
208 printf("%s", event_name(counter));
209 }
210
211 printf( "], ");
212
Ingo Molnarb456bae2009-05-26 09:17:18 +0200213 if (target_pid != -1)
214 printf(" (target_pid: %d", target_pid);
Ingo Molnar07800602009-04-20 15:00:56 +0200215 else
216 printf(" (all");
217
218 if (profile_cpu != -1)
219 printf(", cpu: %d)\n", profile_cpu);
220 else {
Ingo Molnarb456bae2009-05-26 09:17:18 +0200221 if (target_pid != -1)
Ingo Molnar07800602009-04-20 15:00:56 +0200222 printf(")\n");
223 else
224 printf(", %d CPUs)\n", nr_cpus);
225 }
226
227 printf("------------------------------------------------------------------------------\n\n");
228
229 if (nr_counters == 1)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200230 printf(" samples pcnt");
Ingo Molnar07800602009-04-20 15:00:56 +0200231 else
Ingo Molnar2debbc82009-06-05 14:29:10 +0200232 printf(" weight samples pcnt");
Ingo Molnar07800602009-04-20 15:00:56 +0200233
234 printf(" RIP kernel function\n"
Ingo Molnar2debbc82009-06-05 14:29:10 +0200235 " ______ _______ _____ ________________ _______________\n\n"
Ingo Molnar07800602009-04-20 15:00:56 +0200236 );
237
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300238 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
239 struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
240 struct symbol *sym = (struct symbol *)(syme + 1);
Ingo Molnar8fc03212009-06-04 15:19:47 +0200241 char *color = PERF_COLOR_NORMAL;
242 double pcnt;
Ingo Molnar07800602009-04-20 15:00:56 +0200243
Ingo Molnar6e53cdf2009-06-04 08:53:05 +0200244 if (++printed > print_entries || syme->snap_count < count_filter)
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300245 continue;
Ingo Molnar07800602009-04-20 15:00:56 +0200246
Ingo Molnar2debbc82009-06-05 14:29:10 +0200247 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
248 sum_ksamples));
Mike Galbraithd94b9432009-05-25 09:57:56 +0200249
Ingo Molnar8fc03212009-06-04 15:19:47 +0200250 /*
Ingo Molnaraefcf372009-06-08 23:15:28 +0200251 * We color high-overhead entries in red, mid-overhead
252 * entries in green - and keep the low overhead places
253 * normal:
Ingo Molnar8fc03212009-06-04 15:19:47 +0200254 */
Ingo Molnaraefcf372009-06-08 23:15:28 +0200255 if (pcnt >= 5.0) {
Ingo Molnar8fc03212009-06-04 15:19:47 +0200256 color = PERF_COLOR_RED;
Ingo Molnaraefcf372009-06-08 23:15:28 +0200257 } else {
258 if (pcnt >= 0.5)
259 color = PERF_COLOR_GREEN;
260 }
Ingo Molnar8fc03212009-06-04 15:19:47 +0200261
Mike Galbraithd94b9432009-05-25 09:57:56 +0200262 if (nr_counters == 1)
Ingo Molnar2debbc82009-06-05 14:29:10 +0200263 printf("%20.2f - ", syme->weight);
Mike Galbraithd94b9432009-05-25 09:57:56 +0200264 else
Ingo Molnar2debbc82009-06-05 14:29:10 +0200265 printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
Ingo Molnar8fc03212009-06-04 15:19:47 +0200266
267 color_fprintf(stdout, color, "%4.1f%%", pcnt);
268 printf(" - %016llx : %s\n", sym->start, sym->name);
Ingo Molnar07800602009-04-20 15:00:56 +0200269 }
Ingo Molnar07800602009-04-20 15:00:56 +0200270}
271
272static void *display_thread(void *arg)
273{
Frederic Weisbecker0f5486b2009-06-04 20:48:04 +0200274 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
275 int delay_msecs = delay_secs * 1000;
276
Ingo Molnarf2521b62009-06-03 19:17:25 +0200277 printf("PerfTop refresh period: %d seconds\n", delay_secs);
Ingo Molnar07800602009-04-20 15:00:56 +0200278
Frederic Weisbecker0f5486b2009-06-04 20:48:04 +0200279 do {
Ingo Molnar07800602009-04-20 15:00:56 +0200280 print_sym_table();
Frederic Weisbecker0f5486b2009-06-04 20:48:04 +0200281 } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
282
283 printf("key pressed - exiting.\n");
284 exit(0);
Ingo Molnar07800602009-04-20 15:00:56 +0200285
286 return NULL;
287}
288
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300289static int symbol_filter(struct dso *self, struct symbol *sym)
Ingo Molnar07800602009-04-20 15:00:56 +0200290{
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300291 static int filter_match;
292 struct sym_entry *syme;
293 const char *name = sym->name;
Ingo Molnar07800602009-04-20 15:00:56 +0200294
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300295 if (!strcmp(name, "_text") ||
296 !strcmp(name, "_etext") ||
297 !strcmp(name, "_sinittext") ||
298 !strncmp("init_module", name, 11) ||
299 !strncmp("cleanup_module", name, 14) ||
300 strstr(name, "_text_start") ||
301 strstr(name, "_text_end"))
Ingo Molnar07800602009-04-20 15:00:56 +0200302 return 1;
303
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300304 syme = dso__sym_priv(self, sym);
Ingo Molnar2debbc82009-06-05 14:29:10 +0200305 /* Tag samples to be skipped. */
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300306 if (!strcmp("default_idle", name) ||
307 !strcmp("cpu_idle", name) ||
308 !strcmp("enter_idle", name) ||
309 !strcmp("exit_idle", name) ||
310 !strcmp("mwait_idle", name))
311 syme->skip = 1;
Ingo Molnar07800602009-04-20 15:00:56 +0200312
313 if (filter_match == 1) {
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300314 filter_end = sym->start;
Ingo Molnar07800602009-04-20 15:00:56 +0200315 filter_match = -1;
316 if (filter_end - filter_start > 10000) {
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300317 fprintf(stderr,
318 "hm, too large filter symbol <%s> - skipping.\n",
Ingo Molnar07800602009-04-20 15:00:56 +0200319 sym_filter);
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300320 fprintf(stderr, "symbol filter start: %016lx\n",
321 filter_start);
322 fprintf(stderr, " end: %016lx\n",
323 filter_end);
Ingo Molnar07800602009-04-20 15:00:56 +0200324 filter_end = filter_start = 0;
325 sym_filter = NULL;
326 sleep(1);
327 }
328 }
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300329
330 if (filter_match == 0 && sym_filter && !strcmp(name, sym_filter)) {
Ingo Molnar07800602009-04-20 15:00:56 +0200331 filter_match = 1;
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300332 filter_start = sym->start;
Ingo Molnar07800602009-04-20 15:00:56 +0200333 }
334
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300335
Ingo Molnar07800602009-04-20 15:00:56 +0200336 return 0;
337}
338
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300339static int parse_symbols(void)
Ingo Molnar07800602009-04-20 15:00:56 +0200340{
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300341 struct rb_node *node;
342 struct symbol *sym;
Ingo Molnar07800602009-04-20 15:00:56 +0200343
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300344 kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
345 if (kernel_dso == NULL)
346 return -1;
Ingo Molnar07800602009-04-20 15:00:56 +0200347
Ingo Molnarbd741372009-06-04 14:13:04 +0200348 if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) != 0)
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300349 goto out_delete_dso;
Ingo Molnar07800602009-04-20 15:00:56 +0200350
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300351 node = rb_first(&kernel_dso->syms);
352 sym = rb_entry(node, struct symbol, rb_node);
353 min_ip = sym->start;
Ingo Molnar07800602009-04-20 15:00:56 +0200354
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300355 node = rb_last(&kernel_dso->syms);
356 sym = rb_entry(node, struct symbol, rb_node);
Mike Galbraithda417a72009-05-29 08:23:16 +0200357 max_ip = sym->end;
Ingo Molnar07800602009-04-20 15:00:56 +0200358
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300359 if (dump_symtab)
Mike Galbraitha3ec8d72009-05-29 06:46:46 +0200360 dso__fprintf(kernel_dso, stderr);
Ingo Molnar07800602009-04-20 15:00:56 +0200361
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300362 return 0;
Ingo Molnar07800602009-04-20 15:00:56 +0200363
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300364out_delete_dso:
365 dso__delete(kernel_dso);
366 kernel_dso = NULL;
367 return -1;
Ingo Molnar07800602009-04-20 15:00:56 +0200368}
369
Ingo Molnar07800602009-04-20 15:00:56 +0200370#define TRACE_COUNT 3
371
Ingo Molnar07800602009-04-20 15:00:56 +0200372/*
373 * Binary search in the histogram table and record the hit:
374 */
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000375static void record_ip(u64 ip, int counter)
Ingo Molnar07800602009-04-20 15:00:56 +0200376{
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300377 struct symbol *sym = dso__find_symbol(kernel_dso, ip);
Ingo Molnar07800602009-04-20 15:00:56 +0200378
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300379 if (sym != NULL) {
380 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
Ingo Molnar07800602009-04-20 15:00:56 +0200381
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300382 if (!syme->skip) {
383 syme->count[counter]++;
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300384 pthread_mutex_lock(&active_symbols_lock);
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300385 if (list_empty(&syme->node) || !syme->node.next)
Arnaldo Carvalho de Meloc44613a2009-05-29 17:03:07 -0300386 __list_insert_active_sym(syme);
387 pthread_mutex_unlock(&active_symbols_lock);
Arnaldo Carvalho de Melode046872009-05-28 14:55:41 -0300388 return;
Ingo Molnar07800602009-04-20 15:00:56 +0200389 }
Ingo Molnar07800602009-04-20 15:00:56 +0200390 }
391
Ingo Molnar2debbc82009-06-05 14:29:10 +0200392 samples--;
Ingo Molnar07800602009-04-20 15:00:56 +0200393}
394
Peter Zijlstrae6e18ec2009-06-25 11:27:12 +0200395static void process_event(u64 ip, int counter, int user)
Ingo Molnar07800602009-04-20 15:00:56 +0200396{
Ingo Molnar2debbc82009-06-05 14:29:10 +0200397 samples++;
Ingo Molnar07800602009-04-20 15:00:56 +0200398
Peter Zijlstrae6e18ec2009-06-25 11:27:12 +0200399 if (user) {
Ingo Molnar2debbc82009-06-05 14:29:10 +0200400 userspace_samples++;
Ingo Molnar07800602009-04-20 15:00:56 +0200401 return;
402 }
403
404 record_ip(ip, counter);
405}
406
Ingo Molnar07800602009-04-20 15:00:56 +0200407struct mmap_data {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200408 int counter;
409 void *base;
410 unsigned int mask;
411 unsigned int prev;
Ingo Molnar07800602009-04-20 15:00:56 +0200412};
413
414static unsigned int mmap_read_head(struct mmap_data *md)
415{
416 struct perf_counter_mmap_page *pc = md->base;
417 int head;
418
419 head = pc->data_head;
420 rmb();
421
422 return head;
423}
424
425struct timeval last_read, this_read;
426
Frederic Weisbecker2f011902009-06-06 23:10:43 +0200427static void mmap_read_counter(struct mmap_data *md)
Ingo Molnar07800602009-04-20 15:00:56 +0200428{
429 unsigned int head = mmap_read_head(md);
430 unsigned int old = md->prev;
431 unsigned char *data = md->base + page_size;
432 int diff;
433
434 gettimeofday(&this_read, NULL);
435
436 /*
437 * If we're further behind than half the buffer, there's a chance
Ingo Molnar2debbc82009-06-05 14:29:10 +0200438 * the writer will bite our tail and mess up the samples under us.
Ingo Molnar07800602009-04-20 15:00:56 +0200439 *
440 * If we somehow ended up ahead of the head, we got messed up.
441 *
442 * In either case, truncate and restart at head.
443 */
444 diff = head - old;
445 if (diff > md->mask / 2 || diff < 0) {
446 struct timeval iv;
447 unsigned long msecs;
448
449 timersub(&this_read, &last_read, &iv);
450 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
451
452 fprintf(stderr, "WARNING: failed to keep up with mmap data."
453 " Last read %lu msecs ago.\n", msecs);
454
455 /*
456 * head points to a known good entry, start there.
457 */
458 old = head;
459 }
460
461 last_read = this_read;
462
463 for (; old != head;) {
464 struct ip_event {
465 struct perf_event_header header;
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000466 u64 ip;
467 u32 pid, target_pid;
Ingo Molnar07800602009-04-20 15:00:56 +0200468 };
469 struct mmap_event {
470 struct perf_event_header header;
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000471 u32 pid, target_pid;
472 u64 start;
473 u64 len;
474 u64 pgoff;
Ingo Molnar07800602009-04-20 15:00:56 +0200475 char filename[PATH_MAX];
476 };
477
478 typedef union event_union {
479 struct perf_event_header header;
480 struct ip_event ip;
481 struct mmap_event mmap;
482 } event_t;
483
484 event_t *event = (event_t *)&data[old & md->mask];
485
486 event_t event_copy;
487
Ingo Molnar6f06ccb2009-04-20 15:22:22 +0200488 size_t size = event->header.size;
Ingo Molnar07800602009-04-20 15:00:56 +0200489
490 /*
491 * Event straddles the mmap boundary -- header should always
492 * be inside due to u64 alignment of output.
493 */
494 if ((old & md->mask) + size != ((old + size) & md->mask)) {
495 unsigned int offset = old;
496 unsigned int len = min(sizeof(*event), size), cpy;
497 void *dst = &event_copy;
498
499 do {
500 cpy = min(md->mask + 1 - (offset & md->mask), len);
501 memcpy(dst, &data[offset & md->mask], cpy);
502 offset += cpy;
503 dst += cpy;
504 len -= cpy;
505 } while (len);
506
507 event = &event_copy;
508 }
509
510 old += size;
511
Peter Zijlstrae6e18ec2009-06-25 11:27:12 +0200512 if (event->header.type == PERF_EVENT_SAMPLE) {
513 int user =
514 (event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
515 process_event(event->ip.ip, md->counter, user);
Ingo Molnar07800602009-04-20 15:00:56 +0200516 }
517 }
518
519 md->prev = old;
520}
521
Mike Galbraithc2990a22009-05-24 08:35:49 +0200522static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
523static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
524
Frederic Weisbecker2f011902009-06-06 23:10:43 +0200525static void mmap_read(void)
526{
527 int i, counter;
528
529 for (i = 0; i < nr_cpus; i++) {
530 for (counter = 0; counter < nr_counters; counter++)
531 mmap_read_counter(&mmap_array[i][counter]);
532 }
533}
534
Ingo Molnar716c69f2009-06-07 17:31:52 +0200535int nr_poll;
536int group_fd;
537
538static void start_counter(int i, int counter)
Ingo Molnar07800602009-04-20 15:00:56 +0200539{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200540 struct perf_counter_attr *attr;
Ingo Molnar07800602009-04-20 15:00:56 +0200541 unsigned int cpu;
Ingo Molnar716c69f2009-06-07 17:31:52 +0200542
543 cpu = profile_cpu;
544 if (target_pid == -1 && profile_cpu == -1)
545 cpu = i;
546
547 attr = attrs + counter;
548
549 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
550 attr->freq = freq;
551
552try_again:
553 fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
554
555 if (fd[i][counter] < 0) {
556 int err = errno;
557
Ingo Molnar716c69f2009-06-07 17:31:52 +0200558 if (err == EPERM)
Ingo Molnar3da297a2009-06-07 17:39:02 +0200559 die("No permission - are you root?\n");
Ingo Molnar716c69f2009-06-07 17:31:52 +0200560 /*
561 * If it's cycles then fall back to hrtimer
562 * based cpu-clock-tick sw counter, which
563 * is always available even if no PMU support:
564 */
565 if (attr->type == PERF_TYPE_HARDWARE
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200566 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
Ingo Molnar716c69f2009-06-07 17:31:52 +0200567
Ingo Molnar3da297a2009-06-07 17:39:02 +0200568 if (verbose)
569 warning(" ... trying to fall back to cpu-clock-ticks\n");
570
Ingo Molnar716c69f2009-06-07 17:31:52 +0200571 attr->type = PERF_TYPE_SOFTWARE;
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +0200572 attr->config = PERF_COUNT_SW_CPU_CLOCK;
Ingo Molnar716c69f2009-06-07 17:31:52 +0200573 goto try_again;
574 }
Ingo Molnar30c806a2009-06-07 17:46:24 +0200575 printf("\n");
576 error("perfcounter syscall returned with %d (%s)\n",
577 fd[i][counter], strerror(err));
578 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
Ingo Molnar716c69f2009-06-07 17:31:52 +0200579 exit(-1);
580 }
581 assert(fd[i][counter] >= 0);
582 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
583
584 /*
585 * First counter acts as the group leader:
586 */
587 if (group && group_fd == -1)
588 group_fd = fd[i][counter];
589
590 event_array[nr_poll].fd = fd[i][counter];
591 event_array[nr_poll].events = POLLIN;
592 nr_poll++;
593
594 mmap_array[i][counter].counter = counter;
595 mmap_array[i][counter].prev = 0;
596 mmap_array[i][counter].mask = mmap_pages*page_size - 1;
597 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
598 PROT_READ, MAP_SHARED, fd[i][counter], 0);
599 if (mmap_array[i][counter].base == MAP_FAILED)
600 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
601}
602
603static int __cmd_top(void)
604{
605 pthread_t thread;
606 int i, counter;
Ingo Molnar07800602009-04-20 15:00:56 +0200607 int ret;
608
Ingo Molnar07800602009-04-20 15:00:56 +0200609 for (i = 0; i < nr_cpus; i++) {
610 group_fd = -1;
Ingo Molnar716c69f2009-06-07 17:31:52 +0200611 for (counter = 0; counter < nr_counters; counter++)
612 start_counter(i, counter);
Ingo Molnar07800602009-04-20 15:00:56 +0200613 }
614
Frederic Weisbecker2f011902009-06-06 23:10:43 +0200615 /* Wait for a minimal set of events before starting the snapshot */
616 poll(event_array, nr_poll, 100);
617
618 mmap_read();
619
Ingo Molnar07800602009-04-20 15:00:56 +0200620 if (pthread_create(&thread, NULL, display_thread, NULL)) {
621 printf("Could not create display thread.\n");
622 exit(-1);
623 }
624
625 if (realtime_prio) {
626 struct sched_param param;
627
628 param.sched_priority = realtime_prio;
629 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
630 printf("Could not set realtime priority.\n");
631 exit(-1);
632 }
633 }
634
635 while (1) {
Ingo Molnar2debbc82009-06-05 14:29:10 +0200636 int hits = samples;
Ingo Molnar07800602009-04-20 15:00:56 +0200637
Frederic Weisbecker2f011902009-06-06 23:10:43 +0200638 mmap_read();
Ingo Molnar07800602009-04-20 15:00:56 +0200639
Ingo Molnar2debbc82009-06-05 14:29:10 +0200640 if (hits == samples)
Ingo Molnar07800602009-04-20 15:00:56 +0200641 ret = poll(event_array, nr_poll, 100);
642 }
643
644 return 0;
645}
Ingo Molnarb456bae2009-05-26 09:17:18 +0200646
647static const char * const top_usage[] = {
648 "perf top [<options>]",
649 NULL
650};
651
Ingo Molnarb456bae2009-05-26 09:17:18 +0200652static const struct option options[] = {
653 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200654 "event selector. use 'perf list' to list available events",
655 parse_events),
Ingo Molnarb456bae2009-05-26 09:17:18 +0200656 OPT_INTEGER('c', "count", &default_interval,
657 "event period to sample"),
658 OPT_INTEGER('p', "pid", &target_pid,
659 "profile events on existing pid"),
660 OPT_BOOLEAN('a', "all-cpus", &system_wide,
661 "system-wide collection from all CPUs"),
662 OPT_INTEGER('C', "CPU", &profile_cpu,
663 "CPU to profile on"),
664 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
665 "number of mmap data pages"),
666 OPT_INTEGER('r', "realtime", &realtime_prio,
667 "collect data with this RT SCHED_FIFO priority"),
Mike Galbraithdb20c002009-05-26 15:25:34 +0200668 OPT_INTEGER('d', "delay", &delay_secs,
Ingo Molnarb456bae2009-05-26 09:17:18 +0200669 "number of seconds to delay between refreshes"),
670 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
671 "dump the symbol table used for profiling"),
Ingo Molnar6e53cdf2009-06-04 08:53:05 +0200672 OPT_INTEGER('f', "count-filter", &count_filter,
Ingo Molnarb456bae2009-05-26 09:17:18 +0200673 "only display functions with more events than this"),
674 OPT_BOOLEAN('g', "group", &group,
675 "put the counters into a counter group"),
676 OPT_STRING('s', "sym-filter", &sym_filter, "pattern",
677 "only display symbols matchig this pattern"),
Anton Blanchard1f208ea2009-07-01 09:00:44 +1000678 OPT_BOOLEAN('z', "zero", &zero,
Ingo Molnarb456bae2009-05-26 09:17:18 +0200679 "zero history across updates"),
Ingo Molnar6e53cdf2009-06-04 08:53:05 +0200680 OPT_INTEGER('F', "freq", &freq,
Ingo Molnarb456bae2009-05-26 09:17:18 +0200681 "profile at this frequency"),
Ingo Molnar6e53cdf2009-06-04 08:53:05 +0200682 OPT_INTEGER('E', "entries", &print_entries,
683 "display this many functions"),
Ingo Molnar3da297a2009-06-07 17:39:02 +0200684 OPT_BOOLEAN('v', "verbose", &verbose,
685 "be more verbose (show counter open errors, etc)"),
Ingo Molnarb456bae2009-05-26 09:17:18 +0200686 OPT_END()
687};
688
689int cmd_top(int argc, const char **argv, const char *prefix)
690{
691 int counter;
692
693 page_size = sysconf(_SC_PAGE_SIZE);
694
Ingo Molnarb456bae2009-05-26 09:17:18 +0200695 argc = parse_options(argc, argv, options, top_usage, 0);
696 if (argc)
697 usage_with_options(top_usage, options);
698
699 if (freq) {
700 default_interval = freq;
701 freq = 1;
702 }
703
704 /* CPU and PID are mutually exclusive */
705 if (target_pid != -1 && profile_cpu != -1) {
706 printf("WARNING: PID switch overriding CPU\n");
707 sleep(1);
708 profile_cpu = -1;
709 }
710
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200711 if (!nr_counters)
Ingo Molnarb456bae2009-05-26 09:17:18 +0200712 nr_counters = 1;
Ingo Molnarb456bae2009-05-26 09:17:18 +0200713
Frederic Weisbecker2f335a02009-06-05 19:31:01 +0200714 if (delay_secs < 1)
715 delay_secs = 1;
716
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200717 parse_symbols();
718
719 /*
720 * Fill in the ones not specifically initialized via -c:
721 */
Ingo Molnarb456bae2009-05-26 09:17:18 +0200722 for (counter = 0; counter < nr_counters; counter++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200723 if (attrs[counter].sample_period)
Ingo Molnarb456bae2009-05-26 09:17:18 +0200724 continue;
725
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200726 attrs[counter].sample_period = default_interval;
Ingo Molnarb456bae2009-05-26 09:17:18 +0200727 }
728
729 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
730 assert(nr_cpus <= MAX_NR_CPUS);
731 assert(nr_cpus >= 0);
732
733 if (target_pid != -1 || profile_cpu != -1)
734 nr_cpus = 1;
735
Ingo Molnarb456bae2009-05-26 09:17:18 +0200736 return __cmd_top();
737}