738 строки
17 KiB
C
738 строки
17 KiB
C
/*
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* builtin-top.c
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*
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* Builtin top command: Display a continuously updated profile of
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* any workload, CPU or specific PID.
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*
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* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
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*
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* Improvements and fixes by:
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*
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* Arjan van de Ven <arjan@linux.intel.com>
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* Yanmin Zhang <yanmin.zhang@intel.com>
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* Wu Fengguang <fengguang.wu@intel.com>
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* Mike Galbraith <efault@gmx.de>
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* Paul Mackerras <paulus@samba.org>
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*
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* Released under the GPL v2. (and only v2, not any later version)
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*/
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#include "builtin.h"
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#include "perf.h"
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#include "util/symbol.h"
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#include "util/color.h"
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#include "util/util.h"
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#include "util/rbtree.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <sched.h>
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#include <pthread.h>
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#include <sys/syscall.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <sys/mman.h>
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#include <linux/unistd.h>
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#include <linux/types.h>
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static int system_wide = 0;
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static int default_interval = 100000;
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static u64 count_filter = 5;
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static int print_entries = 15;
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static int target_pid = -1;
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static int profile_cpu = -1;
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static int nr_cpus = 0;
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static unsigned int realtime_prio = 0;
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static int group = 0;
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static unsigned int page_size;
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static unsigned int mmap_pages = 16;
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static int freq = 0;
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static int verbose = 0;
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static char *sym_filter;
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static unsigned long filter_start;
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static unsigned long filter_end;
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static int delay_secs = 2;
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static int zero;
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static int dump_symtab;
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/*
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* Symbols
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*/
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static u64 min_ip;
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static u64 max_ip = -1ll;
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struct sym_entry {
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struct rb_node rb_node;
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struct list_head node;
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unsigned long count[MAX_COUNTERS];
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unsigned long snap_count;
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double weight;
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int skip;
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};
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struct sym_entry *sym_filter_entry;
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struct dso *kernel_dso;
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/*
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* Symbols will be added here in record_ip and will get out
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* after decayed.
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*/
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static LIST_HEAD(active_symbols);
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static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
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/*
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* Ordering weight: count-1 * count-2 * ... / count-n
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*/
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static double sym_weight(const struct sym_entry *sym)
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{
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double weight = sym->snap_count;
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int counter;
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for (counter = 1; counter < nr_counters-1; counter++)
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weight *= sym->count[counter];
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weight /= (sym->count[counter] + 1);
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return weight;
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}
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static long samples;
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static long userspace_samples;
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static const char CONSOLE_CLEAR[] = "[H[2J";
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static void __list_insert_active_sym(struct sym_entry *syme)
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{
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list_add(&syme->node, &active_symbols);
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}
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static void list_remove_active_sym(struct sym_entry *syme)
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{
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pthread_mutex_lock(&active_symbols_lock);
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list_del_init(&syme->node);
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pthread_mutex_unlock(&active_symbols_lock);
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}
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static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
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{
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struct rb_node **p = &tree->rb_node;
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struct rb_node *parent = NULL;
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struct sym_entry *iter;
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while (*p != NULL) {
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parent = *p;
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iter = rb_entry(parent, struct sym_entry, rb_node);
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if (se->weight > iter->weight)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&se->rb_node, parent, p);
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rb_insert_color(&se->rb_node, tree);
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}
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static void print_sym_table(void)
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{
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int printed = 0, j;
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int counter;
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float samples_per_sec = samples/delay_secs;
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float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
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float sum_ksamples = 0.0;
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struct sym_entry *syme, *n;
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struct rb_root tmp = RB_ROOT;
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struct rb_node *nd;
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samples = userspace_samples = 0;
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/* Sort the active symbols */
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pthread_mutex_lock(&active_symbols_lock);
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syme = list_entry(active_symbols.next, struct sym_entry, node);
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pthread_mutex_unlock(&active_symbols_lock);
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list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
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syme->snap_count = syme->count[0];
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if (syme->snap_count != 0) {
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syme->weight = sym_weight(syme);
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rb_insert_active_sym(&tmp, syme);
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sum_ksamples += syme->snap_count;
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for (j = 0; j < nr_counters; j++)
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syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
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} else
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list_remove_active_sym(syme);
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}
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puts(CONSOLE_CLEAR);
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printf(
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"------------------------------------------------------------------------------\n");
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printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
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samples_per_sec,
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100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
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if (nr_counters == 1) {
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printf("%Ld", (u64)attrs[0].sample_period);
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if (freq)
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printf("Hz ");
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else
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printf(" ");
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}
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for (counter = 0; counter < nr_counters; counter++) {
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if (counter)
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printf("/");
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printf("%s", event_name(counter));
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}
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printf( "], ");
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if (target_pid != -1)
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printf(" (target_pid: %d", target_pid);
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else
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printf(" (all");
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if (profile_cpu != -1)
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printf(", cpu: %d)\n", profile_cpu);
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else {
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if (target_pid != -1)
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printf(")\n");
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else
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printf(", %d CPUs)\n", nr_cpus);
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}
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printf("------------------------------------------------------------------------------\n\n");
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if (nr_counters == 1)
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printf(" samples pcnt");
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else
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printf(" weight samples pcnt");
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printf(" RIP kernel function\n"
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" ______ _______ _____ ________________ _______________\n\n"
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);
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for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
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struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
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struct symbol *sym = (struct symbol *)(syme + 1);
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char *color = PERF_COLOR_NORMAL;
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double pcnt;
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if (++printed > print_entries || syme->snap_count < count_filter)
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continue;
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pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
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sum_ksamples));
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/*
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* We color high-overhead entries in red, mid-overhead
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* entries in green - and keep the low overhead places
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* normal:
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*/
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if (pcnt >= 5.0) {
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color = PERF_COLOR_RED;
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} else {
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if (pcnt >= 0.5)
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color = PERF_COLOR_GREEN;
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}
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if (nr_counters == 1)
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printf("%20.2f - ", syme->weight);
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else
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printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
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color_fprintf(stdout, color, "%4.1f%%", pcnt);
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printf(" - %016llx : %s\n", sym->start, sym->name);
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}
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}
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static void *display_thread(void *arg)
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{
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struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
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int delay_msecs = delay_secs * 1000;
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printf("PerfTop refresh period: %d seconds\n", delay_secs);
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do {
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print_sym_table();
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} while (!poll(&stdin_poll, 1, delay_msecs) == 1);
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printf("key pressed - exiting.\n");
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exit(0);
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return NULL;
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}
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static int symbol_filter(struct dso *self, struct symbol *sym)
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{
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static int filter_match;
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struct sym_entry *syme;
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const char *name = sym->name;
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if (!strcmp(name, "_text") ||
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!strcmp(name, "_etext") ||
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!strcmp(name, "_sinittext") ||
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!strncmp("init_module", name, 11) ||
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!strncmp("cleanup_module", name, 14) ||
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strstr(name, "_text_start") ||
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strstr(name, "_text_end"))
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return 1;
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syme = dso__sym_priv(self, sym);
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/* Tag samples to be skipped. */
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if (!strcmp("default_idle", name) ||
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!strcmp("cpu_idle", name) ||
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!strcmp("enter_idle", name) ||
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!strcmp("exit_idle", name) ||
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!strcmp("mwait_idle", name))
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syme->skip = 1;
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if (filter_match == 1) {
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filter_end = sym->start;
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filter_match = -1;
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if (filter_end - filter_start > 10000) {
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fprintf(stderr,
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"hm, too large filter symbol <%s> - skipping.\n",
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sym_filter);
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fprintf(stderr, "symbol filter start: %016lx\n",
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filter_start);
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fprintf(stderr, " end: %016lx\n",
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filter_end);
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filter_end = filter_start = 0;
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sym_filter = NULL;
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sleep(1);
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}
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}
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if (filter_match == 0 && sym_filter && !strcmp(name, sym_filter)) {
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filter_match = 1;
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filter_start = sym->start;
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}
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return 0;
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}
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static int parse_symbols(void)
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{
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struct rb_node *node;
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struct symbol *sym;
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kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
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if (kernel_dso == NULL)
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return -1;
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if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) != 0)
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goto out_delete_dso;
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node = rb_first(&kernel_dso->syms);
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sym = rb_entry(node, struct symbol, rb_node);
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min_ip = sym->start;
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node = rb_last(&kernel_dso->syms);
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sym = rb_entry(node, struct symbol, rb_node);
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max_ip = sym->end;
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if (dump_symtab)
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dso__fprintf(kernel_dso, stderr);
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return 0;
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out_delete_dso:
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dso__delete(kernel_dso);
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kernel_dso = NULL;
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return -1;
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}
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#define TRACE_COUNT 3
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/*
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* Binary search in the histogram table and record the hit:
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*/
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static void record_ip(u64 ip, int counter)
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{
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struct symbol *sym = dso__find_symbol(kernel_dso, ip);
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if (sym != NULL) {
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struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
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if (!syme->skip) {
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syme->count[counter]++;
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pthread_mutex_lock(&active_symbols_lock);
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if (list_empty(&syme->node) || !syme->node.next)
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__list_insert_active_sym(syme);
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pthread_mutex_unlock(&active_symbols_lock);
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return;
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}
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}
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samples--;
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}
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static void process_event(u64 ip, int counter, int user)
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{
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samples++;
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if (user) {
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userspace_samples++;
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return;
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}
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record_ip(ip, counter);
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}
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struct mmap_data {
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int counter;
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void *base;
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unsigned int mask;
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unsigned int prev;
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};
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static unsigned int mmap_read_head(struct mmap_data *md)
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{
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struct perf_counter_mmap_page *pc = md->base;
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int head;
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head = pc->data_head;
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rmb();
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return head;
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}
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struct timeval last_read, this_read;
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static void mmap_read_counter(struct mmap_data *md)
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{
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unsigned int head = mmap_read_head(md);
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unsigned int old = md->prev;
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unsigned char *data = md->base + page_size;
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int diff;
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gettimeofday(&this_read, NULL);
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/*
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* If we're further behind than half the buffer, there's a chance
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* the writer will bite our tail and mess up the samples under us.
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*
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* If we somehow ended up ahead of the head, we got messed up.
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*
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* In either case, truncate and restart at head.
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*/
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diff = head - old;
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if (diff > md->mask / 2 || diff < 0) {
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struct timeval iv;
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unsigned long msecs;
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timersub(&this_read, &last_read, &iv);
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msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
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fprintf(stderr, "WARNING: failed to keep up with mmap data."
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" Last read %lu msecs ago.\n", msecs);
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/*
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* head points to a known good entry, start there.
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*/
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old = head;
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}
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last_read = this_read;
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for (; old != head;) {
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struct ip_event {
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struct perf_event_header header;
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u64 ip;
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u32 pid, target_pid;
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};
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struct mmap_event {
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struct perf_event_header header;
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u32 pid, target_pid;
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u64 start;
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u64 len;
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u64 pgoff;
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char filename[PATH_MAX];
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};
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typedef union event_union {
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struct perf_event_header header;
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struct ip_event ip;
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struct mmap_event mmap;
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} event_t;
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event_t *event = (event_t *)&data[old & md->mask];
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event_t event_copy;
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size_t size = event->header.size;
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/*
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* Event straddles the mmap boundary -- header should always
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* be inside due to u64 alignment of output.
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*/
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if ((old & md->mask) + size != ((old + size) & md->mask)) {
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unsigned int offset = old;
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unsigned int len = min(sizeof(*event), size), cpy;
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void *dst = &event_copy;
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do {
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cpy = min(md->mask + 1 - (offset & md->mask), len);
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memcpy(dst, &data[offset & md->mask], cpy);
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offset += cpy;
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dst += cpy;
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len -= cpy;
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} while (len);
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event = &event_copy;
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}
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old += size;
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if (event->header.type == PERF_EVENT_SAMPLE) {
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int user =
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(event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
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process_event(event->ip.ip, md->counter, user);
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}
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}
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md->prev = old;
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}
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static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
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static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
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|
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static void mmap_read(void)
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{
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int i, counter;
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|
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for (i = 0; i < nr_cpus; i++) {
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for (counter = 0; counter < nr_counters; counter++)
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mmap_read_counter(&mmap_array[i][counter]);
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}
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}
|
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|
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int nr_poll;
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int group_fd;
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|
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static void start_counter(int i, int counter)
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{
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struct perf_counter_attr *attr;
|
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unsigned int cpu;
|
||
|
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cpu = profile_cpu;
|
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if (target_pid == -1 && profile_cpu == -1)
|
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cpu = i;
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attr = attrs + counter;
|
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|
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attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
|
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attr->freq = freq;
|
||
|
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try_again:
|
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fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
|
||
|
||
if (fd[i][counter] < 0) {
|
||
int err = errno;
|
||
|
||
if (err == EPERM)
|
||
die("No permission - are you root?\n");
|
||
/*
|
||
* If it's cycles then fall back to hrtimer
|
||
* based cpu-clock-tick sw counter, which
|
||
* is always available even if no PMU support:
|
||
*/
|
||
if (attr->type == PERF_TYPE_HARDWARE
|
||
&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {
|
||
|
||
if (verbose)
|
||
warning(" ... trying to fall back to cpu-clock-ticks\n");
|
||
|
||
attr->type = PERF_TYPE_SOFTWARE;
|
||
attr->config = PERF_COUNT_SW_CPU_CLOCK;
|
||
goto try_again;
|
||
}
|
||
printf("\n");
|
||
error("perfcounter syscall returned with %d (%s)\n",
|
||
fd[i][counter], strerror(err));
|
||
die("No CONFIG_PERF_COUNTERS=y kernel support configured?\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));
|
||
}
|
||
|
||
static int __cmd_top(void)
|
||
{
|
||
pthread_t thread;
|
||
int i, counter;
|
||
int ret;
|
||
|
||
for (i = 0; i < nr_cpus; i++) {
|
||
group_fd = -1;
|
||
for (counter = 0; counter < nr_counters; counter++)
|
||
start_counter(i, counter);
|
||
}
|
||
|
||
/* Wait for a minimal set of events before starting the snapshot */
|
||
poll(event_array, nr_poll, 100);
|
||
|
||
mmap_read();
|
||
|
||
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;
|
||
|
||
mmap_read();
|
||
|
||
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_BOOLEAN('v', "verbose", &verbose,
|
||
"be more verbose (show counter open errors, etc)"),
|
||
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();
|
||
}
|