diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-06-06 18:33:43 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-06-06 18:33:43 (GMT) |
commit | 864709302a80f26fa9da3be5b47304f0b8bae192 (patch) | |
tree | 8c2bab78f141fe43a38914bd3e3aae0a88f958e5 /tools/perf/builtin-top.c | |
parent | 75b5032212641f6d38ac041416945e70da833b68 (diff) | |
download | linux-fsl-qoriq-864709302a80f26fa9da3be5b47304f0b8bae192.tar.xz |
perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/
Several people have suggested that 'perf' has become a full-fledged
tool that should be moved out of Documentation/. Move it to the
(new) tools/ directory.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-top.c')
-rw-r--r-- | tools/perf/builtin-top.c | 692 |
1 files changed, 692 insertions, 0 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c new file mode 100644 index 0000000..f2e7312 --- /dev/null +++ b/tools/perf/builtin-top.c @@ -0,0 +1,692 @@ +/* + * builtin-top.c + * + * Builtin top command: Display a continuously updated profile of + * any workload, CPU or specific PID. + * + * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com> + * + * Improvements and fixes by: + * + * Arjan van de Ven <arjan@linux.intel.com> + * Yanmin Zhang <yanmin.zhang@intel.com> + * Wu Fengguang <fengguang.wu@intel.com> + * Mike Galbraith <efault@gmx.de> + * Paul Mackerras <paulus@samba.org> + * + * Released under the GPL v2. (and only v2, not any later version) + */ +#include "builtin.h" + +#include "perf.h" + +#include "util/symbol.h" +#include "util/color.h" +#include "util/util.h" +#include "util/rbtree.h" +#include "util/parse-options.h" +#include "util/parse-events.h" + +#include <assert.h> +#include <fcntl.h> + +#include <stdio.h> + +#include <errno.h> +#include <time.h> +#include <sched.h> +#include <pthread.h> + +#include <sys/syscall.h> +#include <sys/ioctl.h> +#include <sys/poll.h> +#include <sys/prctl.h> +#include <sys/wait.h> +#include <sys/uio.h> +#include <sys/mman.h> + +#include <linux/unistd.h> +#include <linux/types.h> + +static int fd[MAX_NR_CPUS][MAX_COUNTERS]; + +static int system_wide = 0; + +static int default_interval = 100000; + +static __u64 count_filter = 5; +static int print_entries = 15; + +static int target_pid = -1; +static int profile_cpu = -1; +static int nr_cpus = 0; +static unsigned int realtime_prio = 0; +static int group = 0; +static unsigned int page_size; +static unsigned int mmap_pages = 16; +static int freq = 0; + +static char *sym_filter; +static unsigned long filter_start; +static unsigned long filter_end; + +static int delay_secs = 2; +static int zero; +static int dump_symtab; + +/* + * Symbols + */ + +static uint64_t min_ip; +static uint64_t max_ip = -1ll; + +struct sym_entry { + struct rb_node rb_node; + struct list_head node; + unsigned long count[MAX_COUNTERS]; + unsigned long snap_count; + double weight; + int skip; +}; + +struct sym_entry *sym_filter_entry; + +struct dso *kernel_dso; + +/* + * Symbols will be added here in record_ip and will get out + * after decayed. + */ +static LIST_HEAD(active_symbols); +static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER; + +/* + * Ordering weight: count-1 * count-2 * ... / count-n + */ +static double sym_weight(const struct sym_entry *sym) +{ + double weight = sym->snap_count; + int counter; + + for (counter = 1; counter < nr_counters-1; counter++) + weight *= sym->count[counter]; + + weight /= (sym->count[counter] + 1); + + return weight; +} + +static long samples; +static long userspace_samples; +static const char CONSOLE_CLEAR[] = "[H[2J"; + +static void __list_insert_active_sym(struct sym_entry *syme) +{ + list_add(&syme->node, &active_symbols); +} + +static void list_remove_active_sym(struct sym_entry *syme) +{ + pthread_mutex_lock(&active_symbols_lock); + list_del_init(&syme->node); + pthread_mutex_unlock(&active_symbols_lock); +} + +static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se) +{ + struct rb_node **p = &tree->rb_node; + struct rb_node *parent = NULL; + struct sym_entry *iter; + + while (*p != NULL) { + parent = *p; + iter = rb_entry(parent, struct sym_entry, rb_node); + + if (se->weight > iter->weight) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + + rb_link_node(&se->rb_node, parent, p); + rb_insert_color(&se->rb_node, tree); +} + +static void print_sym_table(void) +{ + int printed = 0, j; + int counter; + float samples_per_sec = samples/delay_secs; + float ksamples_per_sec = (samples-userspace_samples)/delay_secs; + float sum_ksamples = 0.0; + struct sym_entry *syme, *n; + struct rb_root tmp = RB_ROOT; + struct rb_node *nd; + + samples = userspace_samples = 0; + + /* Sort the active symbols */ + pthread_mutex_lock(&active_symbols_lock); + syme = list_entry(active_symbols.next, struct sym_entry, node); + pthread_mutex_unlock(&active_symbols_lock); + + list_for_each_entry_safe_from(syme, n, &active_symbols, node) { + syme->snap_count = syme->count[0]; + if (syme->snap_count != 0) { + syme->weight = sym_weight(syme); + rb_insert_active_sym(&tmp, syme); + sum_ksamples += syme->snap_count; + + for (j = 0; j < nr_counters; j++) + syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8; + } else + list_remove_active_sym(syme); + } + + puts(CONSOLE_CLEAR); + + printf( +"------------------------------------------------------------------------------\n"); + printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [", + samples_per_sec, + 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec))); + + if (nr_counters == 1) { + printf("%Ld", attrs[0].sample_period); + if (freq) + printf("Hz "); + else + printf(" "); + } + + for (counter = 0; counter < nr_counters; counter++) { + if (counter) + printf("/"); + + printf("%s", event_name(counter)); + } + + printf( "], "); + + if (target_pid != -1) + printf(" (target_pid: %d", target_pid); + else + printf(" (all"); + + if (profile_cpu != -1) + printf(", cpu: %d)\n", profile_cpu); + else { + if (target_pid != -1) + printf(")\n"); + else + printf(", %d CPUs)\n", nr_cpus); + } + + printf("------------------------------------------------------------------------------\n\n"); + + if (nr_counters == 1) + printf(" samples pcnt"); + else + printf(" weight samples pcnt"); + + printf(" RIP kernel function\n" + " ______ _______ _____ ________________ _______________\n\n" + ); + + for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) { + struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node); + struct symbol *sym = (struct symbol *)(syme + 1); + char *color = PERF_COLOR_NORMAL; + double pcnt; + + if (++printed > print_entries || syme->snap_count < count_filter) + continue; + + pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) / + sum_ksamples)); + + /* + * We color high-overhead entries in red, low-overhead + * entries in green - and keep the middle ground normal: + */ + if (pcnt >= 5.0) + color = PERF_COLOR_RED; + if (pcnt < 0.5) + color = PERF_COLOR_GREEN; + + if (nr_counters == 1) + printf("%20.2f - ", syme->weight); + else + printf("%9.1f %10ld - ", syme->weight, syme->snap_count); + + color_fprintf(stdout, color, "%4.1f%%", pcnt); + printf(" - %016llx : %s\n", sym->start, sym->name); + } +} + +static void *display_thread(void *arg) +{ + struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; + int delay_msecs = delay_secs * 1000; + + printf("PerfTop refresh period: %d seconds\n", delay_secs); + + do { + print_sym_table(); + } while (!poll(&stdin_poll, 1, delay_msecs) == 1); + + printf("key pressed - exiting.\n"); + exit(0); + + return NULL; +} + +static int symbol_filter(struct dso *self, struct symbol *sym) +{ + static int filter_match; + struct sym_entry *syme; + const char *name = sym->name; + + if (!strcmp(name, "_text") || + !strcmp(name, "_etext") || + !strcmp(name, "_sinittext") || + !strncmp("init_module", name, 11) || + !strncmp("cleanup_module", name, 14) || + strstr(name, "_text_start") || + strstr(name, "_text_end")) + return 1; + + syme = dso__sym_priv(self, sym); + /* Tag samples to be skipped. */ + if (!strcmp("default_idle", name) || + !strcmp("cpu_idle", name) || + !strcmp("enter_idle", name) || + !strcmp("exit_idle", name) || + !strcmp("mwait_idle", name)) + syme->skip = 1; + + if (filter_match == 1) { + filter_end = sym->start; + filter_match = -1; + if (filter_end - filter_start > 10000) { + fprintf(stderr, + "hm, too large filter symbol <%s> - skipping.\n", + sym_filter); + fprintf(stderr, "symbol filter start: %016lx\n", + filter_start); + fprintf(stderr, " end: %016lx\n", + filter_end); + filter_end = filter_start = 0; + sym_filter = NULL; + sleep(1); + } + } + + if (filter_match == 0 && sym_filter && !strcmp(name, sym_filter)) { + filter_match = 1; + filter_start = sym->start; + } + + + return 0; +} + +static int parse_symbols(void) +{ + struct rb_node *node; + struct symbol *sym; + + kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry)); + if (kernel_dso == NULL) + return -1; + + if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) != 0) + goto out_delete_dso; + + node = rb_first(&kernel_dso->syms); + sym = rb_entry(node, struct symbol, rb_node); + min_ip = sym->start; + + node = rb_last(&kernel_dso->syms); + sym = rb_entry(node, struct symbol, rb_node); + max_ip = sym->end; + + if (dump_symtab) + dso__fprintf(kernel_dso, stderr); + + return 0; + +out_delete_dso: + dso__delete(kernel_dso); + kernel_dso = NULL; + return -1; +} + +#define TRACE_COUNT 3 + +/* + * Binary search in the histogram table and record the hit: + */ +static void record_ip(uint64_t ip, int counter) +{ + struct symbol *sym = dso__find_symbol(kernel_dso, ip); + + if (sym != NULL) { + struct sym_entry *syme = dso__sym_priv(kernel_dso, sym); + + if (!syme->skip) { + syme->count[counter]++; + pthread_mutex_lock(&active_symbols_lock); + if (list_empty(&syme->node) || !syme->node.next) + __list_insert_active_sym(syme); + pthread_mutex_unlock(&active_symbols_lock); + return; + } + } + + samples--; +} + +static void process_event(uint64_t ip, int counter) +{ + samples++; + + if (ip < min_ip || ip > max_ip) { + userspace_samples++; + return; + } + + record_ip(ip, counter); +} + +struct mmap_data { + int counter; + void *base; + unsigned int mask; + unsigned int prev; +}; + +static unsigned int mmap_read_head(struct mmap_data *md) +{ + struct perf_counter_mmap_page *pc = md->base; + int head; + + head = pc->data_head; + rmb(); + + return head; +} + +struct timeval last_read, this_read; + +static void mmap_read(struct mmap_data *md) +{ + unsigned int head = mmap_read_head(md); + unsigned int old = md->prev; + unsigned char *data = md->base + page_size; + int diff; + + gettimeofday(&this_read, NULL); + + /* + * If we're further behind than half the buffer, there's a chance + * the writer will bite our tail and mess up the samples under us. + * + * If we somehow ended up ahead of the head, we got messed up. + * + * In either case, truncate and restart at head. + */ + diff = head - old; + if (diff > md->mask / 2 || diff < 0) { + struct timeval iv; + unsigned long msecs; + + timersub(&this_read, &last_read, &iv); + msecs = iv.tv_sec*1000 + iv.tv_usec/1000; + + fprintf(stderr, "WARNING: failed to keep up with mmap data." + " Last read %lu msecs ago.\n", msecs); + + /* + * head points to a known good entry, start there. + */ + old = head; + } + + last_read = this_read; + + for (; old != head;) { + struct ip_event { + struct perf_event_header header; + __u64 ip; + __u32 pid, target_pid; + }; + struct mmap_event { + struct perf_event_header header; + __u32 pid, target_pid; + __u64 start; + __u64 len; + __u64 pgoff; + char filename[PATH_MAX]; + }; + + typedef union event_union { + struct perf_event_header header; + struct ip_event ip; + struct mmap_event mmap; + } event_t; + + event_t *event = (event_t *)&data[old & md->mask]; + + event_t event_copy; + + size_t size = event->header.size; + + /* + * Event straddles the mmap boundary -- header should always + * be inside due to u64 alignment of output. + */ + if ((old & md->mask) + size != ((old + size) & md->mask)) { + unsigned int offset = old; + unsigned int len = min(sizeof(*event), size), cpy; + void *dst = &event_copy; + + do { + cpy = min(md->mask + 1 - (offset & md->mask), len); + memcpy(dst, &data[offset & md->mask], cpy); + offset += cpy; + dst += cpy; + len -= cpy; + } while (len); + + event = &event_copy; + } + + old += size; + + if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) { + if (event->header.type & PERF_SAMPLE_IP) + process_event(event->ip.ip, md->counter); + } + } + + md->prev = old; +} + +static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; +static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; + +static int __cmd_top(void) +{ + struct perf_counter_attr *attr; + pthread_t thread; + int i, counter, group_fd, nr_poll = 0; + unsigned int cpu; + int ret; + + for (i = 0; i < nr_cpus; i++) { + group_fd = -1; + for (counter = 0; counter < nr_counters; counter++) { + + cpu = profile_cpu; + if (target_pid == -1 && profile_cpu == -1) + cpu = i; + + attr = attrs + counter; + + attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; + attr->freq = freq; + + fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0); + if (fd[i][counter] < 0) { + int err = errno; + + error("syscall returned with %d (%s)\n", + fd[i][counter], strerror(err)); + if (err == EPERM) + printf("Are you root?\n"); + exit(-1); + } + assert(fd[i][counter] >= 0); + fcntl(fd[i][counter], F_SETFL, O_NONBLOCK); + + /* + * First counter acts as the group leader: + */ + if (group && group_fd == -1) + group_fd = fd[i][counter]; + + event_array[nr_poll].fd = fd[i][counter]; + event_array[nr_poll].events = POLLIN; + nr_poll++; + + mmap_array[i][counter].counter = counter; + mmap_array[i][counter].prev = 0; + mmap_array[i][counter].mask = mmap_pages*page_size - 1; + mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size, + PROT_READ, MAP_SHARED, fd[i][counter], 0); + if (mmap_array[i][counter].base == MAP_FAILED) + die("failed to mmap with %d (%s)\n", errno, strerror(errno)); + } + } + + if (pthread_create(&thread, NULL, display_thread, NULL)) { + printf("Could not create display thread.\n"); + exit(-1); + } + + if (realtime_prio) { + struct sched_param param; + + param.sched_priority = realtime_prio; + if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { + printf("Could not set realtime priority.\n"); + exit(-1); + } + } + + while (1) { + int hits = samples; + + for (i = 0; i < nr_cpus; i++) { + for (counter = 0; counter < nr_counters; counter++) + mmap_read(&mmap_array[i][counter]); + } + + if (hits == samples) + ret = poll(event_array, nr_poll, 100); + } + + return 0; +} + +static const char * const top_usage[] = { + "perf top [<options>]", + NULL +}; + +static const struct option options[] = { + OPT_CALLBACK('e', "event", NULL, "event", + "event selector. use 'perf list' to list available events", + parse_events), + OPT_INTEGER('c', "count", &default_interval, + "event period to sample"), + OPT_INTEGER('p', "pid", &target_pid, + "profile events on existing pid"), + OPT_BOOLEAN('a', "all-cpus", &system_wide, + "system-wide collection from all CPUs"), + OPT_INTEGER('C', "CPU", &profile_cpu, + "CPU to profile on"), + OPT_INTEGER('m', "mmap-pages", &mmap_pages, + "number of mmap data pages"), + OPT_INTEGER('r', "realtime", &realtime_prio, + "collect data with this RT SCHED_FIFO priority"), + OPT_INTEGER('d', "delay", &delay_secs, + "number of seconds to delay between refreshes"), + OPT_BOOLEAN('D', "dump-symtab", &dump_symtab, + "dump the symbol table used for profiling"), + OPT_INTEGER('f', "count-filter", &count_filter, + "only display functions with more events than this"), + OPT_BOOLEAN('g', "group", &group, + "put the counters into a counter group"), + OPT_STRING('s', "sym-filter", &sym_filter, "pattern", + "only display symbols matchig this pattern"), + OPT_BOOLEAN('z', "zero", &group, + "zero history across updates"), + OPT_INTEGER('F', "freq", &freq, + "profile at this frequency"), + OPT_INTEGER('E', "entries", &print_entries, + "display this many functions"), + OPT_END() +}; + +int cmd_top(int argc, const char **argv, const char *prefix) +{ + int counter; + + page_size = sysconf(_SC_PAGE_SIZE); + + argc = parse_options(argc, argv, options, top_usage, 0); + if (argc) + usage_with_options(top_usage, options); + + if (freq) { + default_interval = freq; + freq = 1; + } + + /* CPU and PID are mutually exclusive */ + if (target_pid != -1 && profile_cpu != -1) { + printf("WARNING: PID switch overriding CPU\n"); + sleep(1); + profile_cpu = -1; + } + + if (!nr_counters) + nr_counters = 1; + + if (delay_secs < 1) + delay_secs = 1; + + parse_symbols(); + + /* + * Fill in the ones not specifically initialized via -c: + */ + for (counter = 0; counter < nr_counters; counter++) { + if (attrs[counter].sample_period) + continue; + + attrs[counter].sample_period = default_interval; + } + + nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); + assert(nr_cpus <= MAX_NR_CPUS); + assert(nr_cpus >= 0); + + if (target_pid != -1 || profile_cpu != -1) + nr_cpus = 1; + + return __cmd_top(); +} |