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c10edee2e1
The perf_event_open() system call returns EACCES if the user is
not root which results in a very confusing error message:
$ perf record -A -a -f
Error: perfcounter syscall returned with -1 (Permission denied)
Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
It turns out that's because perf tools are checking only for
EPERM. Fix that up to get a much better error message:
$ perf record -A -a -f
Fatal: Permission error - are you root?
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1257696066-4046-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1216 lines
27 KiB
C
1216 lines
27 KiB
C
/*
|
||
* 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 <linux/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 "util/debug.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 <termios.h>
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#include <unistd.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 int 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 inherit = 0;
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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 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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* Source
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*/
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struct source_line {
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u64 eip;
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unsigned long count[MAX_COUNTERS];
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char *line;
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struct source_line *next;
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};
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static char *sym_filter = NULL;
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struct sym_entry *sym_filter_entry = NULL;
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static int sym_pcnt_filter = 5;
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static int sym_counter = 0;
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static int display_weighted = -1;
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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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struct source_line *source;
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struct source_line *lines;
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struct source_line **lines_tail;
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pthread_mutex_t source_lock;
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};
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/*
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* Source functions
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*/
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static void parse_source(struct sym_entry *syme)
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{
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struct symbol *sym;
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struct module *module;
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struct section *section = NULL;
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FILE *file;
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char command[PATH_MAX*2];
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const char *path = vmlinux_name;
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u64 start, end, len;
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if (!syme)
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return;
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if (syme->lines) {
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pthread_mutex_lock(&syme->source_lock);
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goto out_assign;
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}
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sym = (struct symbol *)(syme + 1);
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module = sym->module;
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if (module)
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path = module->path;
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if (!path)
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return;
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start = sym->obj_start;
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if (!start)
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start = sym->start;
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if (module) {
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section = module->sections->find_section(module->sections, ".text");
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if (section)
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start -= section->vma;
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}
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end = start + sym->end - sym->start + 1;
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len = sym->end - sym->start;
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sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
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file = popen(command, "r");
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if (!file)
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return;
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pthread_mutex_lock(&syme->source_lock);
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syme->lines_tail = &syme->lines;
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while (!feof(file)) {
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struct source_line *src;
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size_t dummy = 0;
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char *c;
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src = malloc(sizeof(struct source_line));
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assert(src != NULL);
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memset(src, 0, sizeof(struct source_line));
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if (getline(&src->line, &dummy, file) < 0)
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break;
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if (!src->line)
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break;
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c = strchr(src->line, '\n');
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if (c)
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*c = 0;
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src->next = NULL;
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*syme->lines_tail = src;
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syme->lines_tail = &src->next;
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if (strlen(src->line)>8 && src->line[8] == ':') {
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src->eip = strtoull(src->line, NULL, 16);
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if (section)
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src->eip += section->vma;
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}
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if (strlen(src->line)>8 && src->line[16] == ':') {
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src->eip = strtoull(src->line, NULL, 16);
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if (section)
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src->eip += section->vma;
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}
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}
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pclose(file);
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out_assign:
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sym_filter_entry = syme;
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pthread_mutex_unlock(&syme->source_lock);
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}
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static void __zero_source_counters(struct sym_entry *syme)
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{
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int i;
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struct source_line *line;
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line = syme->lines;
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while (line) {
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for (i = 0; i < nr_counters; i++)
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line->count[i] = 0;
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line = line->next;
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}
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}
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static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
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{
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struct source_line *line;
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if (syme != sym_filter_entry)
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return;
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if (pthread_mutex_trylock(&syme->source_lock))
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return;
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if (!syme->source)
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goto out_unlock;
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for (line = syme->lines; line; line = line->next) {
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if (line->eip == ip) {
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line->count[counter]++;
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break;
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}
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if (line->eip > ip)
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break;
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}
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out_unlock:
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pthread_mutex_unlock(&syme->source_lock);
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}
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static void lookup_sym_source(struct sym_entry *syme)
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{
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struct symbol *symbol = (struct symbol *)(syme + 1);
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struct source_line *line;
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char pattern[PATH_MAX];
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char *idx;
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sprintf(pattern, "<%s>:", symbol->name);
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if (symbol->module) {
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idx = strstr(pattern, "\t");
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if (idx)
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*idx = 0;
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}
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pthread_mutex_lock(&syme->source_lock);
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for (line = syme->lines; line; line = line->next) {
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if (strstr(line->line, pattern)) {
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syme->source = line;
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break;
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}
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}
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pthread_mutex_unlock(&syme->source_lock);
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}
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static void show_lines(struct source_line *queue, int count, int total)
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{
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int i;
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struct source_line *line;
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line = queue;
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for (i = 0; i < count; i++) {
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float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
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printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
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line = line->next;
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}
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}
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#define TRACE_COUNT 3
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static void show_details(struct sym_entry *syme)
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{
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struct symbol *symbol;
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struct source_line *line;
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struct source_line *line_queue = NULL;
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int displayed = 0;
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int line_queue_count = 0, total = 0, more = 0;
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if (!syme)
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return;
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if (!syme->source)
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lookup_sym_source(syme);
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if (!syme->source)
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return;
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symbol = (struct symbol *)(syme + 1);
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printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
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printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter);
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pthread_mutex_lock(&syme->source_lock);
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line = syme->source;
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while (line) {
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total += line->count[sym_counter];
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line = line->next;
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}
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line = syme->source;
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while (line) {
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float pcnt = 0.0;
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|
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if (!line_queue_count)
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line_queue = line;
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line_queue_count++;
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|
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if (line->count[sym_counter])
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pcnt = 100.0 * line->count[sym_counter] / (float)total;
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if (pcnt >= (float)sym_pcnt_filter) {
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if (displayed <= print_entries)
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show_lines(line_queue, line_queue_count, total);
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else more++;
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displayed += line_queue_count;
|
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line_queue_count = 0;
|
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line_queue = NULL;
|
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} else if (line_queue_count > TRACE_COUNT) {
|
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line_queue = line_queue->next;
|
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line_queue_count--;
|
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}
|
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|
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line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
|
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line = line->next;
|
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}
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pthread_mutex_unlock(&syme->source_lock);
|
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if (more)
|
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printf("%d lines not displayed, maybe increase display entries [e]\n", more);
|
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}
|
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|
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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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/*
|
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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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|
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if (!display_weighted)
|
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return weight;
|
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|
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for (counter = 1; counter < nr_counters-1; counter++)
|
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weight *= sym->count[counter];
|
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|
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weight /= (sym->count[counter] + 1);
|
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|
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return weight;
|
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}
|
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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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|
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static void __list_insert_active_sym(struct sym_entry *syme)
|
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{
|
||
list_add(&syme->node, &active_symbols);
|
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}
|
||
|
||
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);
|
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}
|
||
|
||
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, snap = !display_weighted ? sym_counter : 0;
|
||
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[snap];
|
||
if (syme->snap_count != 0) {
|
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syme->weight = sym_weight(syme);
|
||
rb_insert_active_sym(&tmp, syme);
|
||
sum_ksamples += syme->snap_count;
|
||
|
||
for (j = 0; j < nr_counters; j++)
|
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syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
|
||
} else
|
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list_remove_active_sym(syme);
|
||
}
|
||
|
||
puts(CONSOLE_CLEAR);
|
||
|
||
printf(
|
||
"------------------------------------------------------------------------------\n");
|
||
printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [",
|
||
samples_per_sec,
|
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100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
|
||
|
||
if (nr_counters == 1 || !display_weighted) {
|
||
printf("%Ld", (u64)attrs[0].sample_period);
|
||
if (freq)
|
||
printf("Hz ");
|
||
else
|
||
printf(" ");
|
||
}
|
||
|
||
if (!display_weighted)
|
||
printf("%s", event_name(sym_counter));
|
||
else 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 (sym_filter_entry) {
|
||
show_details(sym_filter_entry);
|
||
return;
|
||
}
|
||
|
||
if (nr_counters == 1)
|
||
printf(" samples pcnt");
|
||
else
|
||
printf(" weight samples pcnt");
|
||
|
||
if (verbose)
|
||
printf(" RIP ");
|
||
printf(" kernel function\n");
|
||
printf(" %s _______ _____",
|
||
nr_counters == 1 ? " " : "______");
|
||
if (verbose)
|
||
printf(" ________________");
|
||
printf(" _______________\n\n");
|
||
|
||
for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
|
||
struct symbol *sym;
|
||
double pcnt;
|
||
|
||
syme = rb_entry(nd, struct sym_entry, rb_node);
|
||
sym = (struct symbol *)(syme + 1);
|
||
|
||
if (++printed > print_entries || (int)syme->snap_count < count_filter)
|
||
continue;
|
||
|
||
pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
|
||
sum_ksamples));
|
||
|
||
if (nr_counters == 1 || !display_weighted)
|
||
printf("%20.2f - ", syme->weight);
|
||
else
|
||
printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
|
||
|
||
percent_color_fprintf(stdout, "%4.1f%%", pcnt);
|
||
if (verbose)
|
||
printf(" - %016llx", sym->start);
|
||
printf(" : %s", sym->name);
|
||
if (sym->module)
|
||
printf("\t[%s]", sym->module->name);
|
||
printf("\n");
|
||
}
|
||
}
|
||
|
||
static void prompt_integer(int *target, const char *msg)
|
||
{
|
||
char *buf = malloc(0), *p;
|
||
size_t dummy = 0;
|
||
int tmp;
|
||
|
||
fprintf(stdout, "\n%s: ", msg);
|
||
if (getline(&buf, &dummy, stdin) < 0)
|
||
return;
|
||
|
||
p = strchr(buf, '\n');
|
||
if (p)
|
||
*p = 0;
|
||
|
||
p = buf;
|
||
while(*p) {
|
||
if (!isdigit(*p))
|
||
goto out_free;
|
||
p++;
|
||
}
|
||
tmp = strtoul(buf, NULL, 10);
|
||
*target = tmp;
|
||
out_free:
|
||
free(buf);
|
||
}
|
||
|
||
static void prompt_percent(int *target, const char *msg)
|
||
{
|
||
int tmp = 0;
|
||
|
||
prompt_integer(&tmp, msg);
|
||
if (tmp >= 0 && tmp <= 100)
|
||
*target = tmp;
|
||
}
|
||
|
||
static void prompt_symbol(struct sym_entry **target, const char *msg)
|
||
{
|
||
char *buf = malloc(0), *p;
|
||
struct sym_entry *syme = *target, *n, *found = NULL;
|
||
size_t dummy = 0;
|
||
|
||
/* zero counters of active symbol */
|
||
if (syme) {
|
||
pthread_mutex_lock(&syme->source_lock);
|
||
__zero_source_counters(syme);
|
||
*target = NULL;
|
||
pthread_mutex_unlock(&syme->source_lock);
|
||
}
|
||
|
||
fprintf(stdout, "\n%s: ", msg);
|
||
if (getline(&buf, &dummy, stdin) < 0)
|
||
goto out_free;
|
||
|
||
p = strchr(buf, '\n');
|
||
if (p)
|
||
*p = 0;
|
||
|
||
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) {
|
||
struct symbol *sym = (struct symbol *)(syme + 1);
|
||
|
||
if (!strcmp(buf, sym->name)) {
|
||
found = syme;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!found) {
|
||
fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
|
||
sleep(1);
|
||
return;
|
||
} else
|
||
parse_source(found);
|
||
|
||
out_free:
|
||
free(buf);
|
||
}
|
||
|
||
static void print_mapped_keys(void)
|
||
{
|
||
char *name = NULL;
|
||
|
||
if (sym_filter_entry) {
|
||
struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
|
||
name = sym->name;
|
||
}
|
||
|
||
fprintf(stdout, "\nMapped keys:\n");
|
||
fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs);
|
||
fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries);
|
||
|
||
if (nr_counters > 1)
|
||
fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter));
|
||
|
||
fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
|
||
|
||
if (vmlinux_name) {
|
||
fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
|
||
fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
|
||
fprintf(stdout, "\t[S] stop annotation.\n");
|
||
}
|
||
|
||
if (nr_counters > 1)
|
||
fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
|
||
|
||
fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0);
|
||
fprintf(stdout, "\t[qQ] quit.\n");
|
||
}
|
||
|
||
static int key_mapped(int c)
|
||
{
|
||
switch (c) {
|
||
case 'd':
|
||
case 'e':
|
||
case 'f':
|
||
case 'z':
|
||
case 'q':
|
||
case 'Q':
|
||
return 1;
|
||
case 'E':
|
||
case 'w':
|
||
return nr_counters > 1 ? 1 : 0;
|
||
case 'F':
|
||
case 's':
|
||
case 'S':
|
||
return vmlinux_name ? 1 : 0;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void handle_keypress(int c)
|
||
{
|
||
if (!key_mapped(c)) {
|
||
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
|
||
struct termios tc, save;
|
||
|
||
print_mapped_keys();
|
||
fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
|
||
fflush(stdout);
|
||
|
||
tcgetattr(0, &save);
|
||
tc = save;
|
||
tc.c_lflag &= ~(ICANON | ECHO);
|
||
tc.c_cc[VMIN] = 0;
|
||
tc.c_cc[VTIME] = 0;
|
||
tcsetattr(0, TCSANOW, &tc);
|
||
|
||
poll(&stdin_poll, 1, -1);
|
||
c = getc(stdin);
|
||
|
||
tcsetattr(0, TCSAFLUSH, &save);
|
||
if (!key_mapped(c))
|
||
return;
|
||
}
|
||
|
||
switch (c) {
|
||
case 'd':
|
||
prompt_integer(&delay_secs, "Enter display delay");
|
||
if (delay_secs < 1)
|
||
delay_secs = 1;
|
||
break;
|
||
case 'e':
|
||
prompt_integer(&print_entries, "Enter display entries (lines)");
|
||
break;
|
||
case 'E':
|
||
if (nr_counters > 1) {
|
||
int i;
|
||
|
||
fprintf(stderr, "\nAvailable events:");
|
||
for (i = 0; i < nr_counters; i++)
|
||
fprintf(stderr, "\n\t%d %s", i, event_name(i));
|
||
|
||
prompt_integer(&sym_counter, "Enter details event counter");
|
||
|
||
if (sym_counter >= nr_counters) {
|
||
fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
|
||
sym_counter = 0;
|
||
sleep(1);
|
||
}
|
||
} else sym_counter = 0;
|
||
break;
|
||
case 'f':
|
||
prompt_integer(&count_filter, "Enter display event count filter");
|
||
break;
|
||
case 'F':
|
||
prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
|
||
break;
|
||
case 'q':
|
||
case 'Q':
|
||
printf("exiting.\n");
|
||
exit(0);
|
||
case 's':
|
||
prompt_symbol(&sym_filter_entry, "Enter details symbol");
|
||
break;
|
||
case 'S':
|
||
if (!sym_filter_entry)
|
||
break;
|
||
else {
|
||
struct sym_entry *syme = sym_filter_entry;
|
||
|
||
pthread_mutex_lock(&syme->source_lock);
|
||
sym_filter_entry = NULL;
|
||
__zero_source_counters(syme);
|
||
pthread_mutex_unlock(&syme->source_lock);
|
||
}
|
||
break;
|
||
case 'w':
|
||
display_weighted = ~display_weighted;
|
||
break;
|
||
case 'z':
|
||
zero = ~zero;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
static void *display_thread(void *arg __used)
|
||
{
|
||
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
|
||
struct termios tc, save;
|
||
int delay_msecs, c;
|
||
|
||
tcgetattr(0, &save);
|
||
tc = save;
|
||
tc.c_lflag &= ~(ICANON | ECHO);
|
||
tc.c_cc[VMIN] = 0;
|
||
tc.c_cc[VTIME] = 0;
|
||
|
||
repeat:
|
||
delay_msecs = delay_secs * 1000;
|
||
tcsetattr(0, TCSANOW, &tc);
|
||
/* trash return*/
|
||
getc(stdin);
|
||
|
||
do {
|
||
print_sym_table();
|
||
} while (!poll(&stdin_poll, 1, delay_msecs) == 1);
|
||
|
||
c = getc(stdin);
|
||
tcsetattr(0, TCSAFLUSH, &save);
|
||
|
||
handle_keypress(c);
|
||
goto repeat;
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Tag samples to be skipped. */
|
||
static const char *skip_symbols[] = {
|
||
"default_idle",
|
||
"cpu_idle",
|
||
"enter_idle",
|
||
"exit_idle",
|
||
"mwait_idle",
|
||
"mwait_idle_with_hints",
|
||
"poll_idle",
|
||
"ppc64_runlatch_off",
|
||
"pseries_dedicated_idle_sleep",
|
||
NULL
|
||
};
|
||
|
||
static int symbol_filter(struct dso *self, struct symbol *sym)
|
||
{
|
||
struct sym_entry *syme;
|
||
const char *name = sym->name;
|
||
int i;
|
||
|
||
/*
|
||
* ppc64 uses function descriptors and appends a '.' to the
|
||
* start of every instruction address. Remove it.
|
||
*/
|
||
if (name[0] == '.')
|
||
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);
|
||
pthread_mutex_init(&syme->source_lock, NULL);
|
||
if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
|
||
sym_filter_entry = syme;
|
||
|
||
for (i = 0; skip_symbols[i]; i++) {
|
||
if (!strcmp(skip_symbols[i], name)) {
|
||
syme->skip = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int parse_symbols(void)
|
||
{
|
||
struct rb_node *node;
|
||
struct symbol *sym;
|
||
int use_modules = vmlinux_name ? 1 : 0;
|
||
|
||
kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
|
||
if (kernel_dso == NULL)
|
||
return -1;
|
||
|
||
if (dso__load_kernel(kernel_dso, vmlinux_name, symbol_filter, verbose, use_modules) <= 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;
|
||
}
|
||
|
||
/*
|
||
* Binary search in the histogram table and record the hit:
|
||
*/
|
||
static void record_ip(u64 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]++;
|
||
record_precise_ip(syme, counter, ip);
|
||
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(u64 ip, int counter, int user)
|
||
{
|
||
samples++;
|
||
|
||
if (user) {
|
||
userspace_samples++;
|
||
return;
|
||
}
|
||
|
||
record_ip(ip, counter);
|
||
}
|
||
|
||
struct mmap_data {
|
||
int counter;
|
||
void *base;
|
||
int mask;
|
||
unsigned int prev;
|
||
};
|
||
|
||
static unsigned int mmap_read_head(struct mmap_data *md)
|
||
{
|
||
struct perf_event_mmap_page *pc = md->base;
|
||
int head;
|
||
|
||
head = pc->data_head;
|
||
rmb();
|
||
|
||
return head;
|
||
}
|
||
|
||
struct timeval last_read, this_read;
|
||
|
||
static void mmap_read_counter(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;) {
|
||
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.type == PERF_RECORD_SAMPLE) {
|
||
int user =
|
||
(event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
|
||
process_event(event->ip.ip, md->counter, user);
|
||
}
|
||
}
|
||
|
||
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 void mmap_read(void)
|
||
{
|
||
int i, counter;
|
||
|
||
for (i = 0; i < nr_cpus; i++) {
|
||
for (counter = 0; counter < nr_counters; counter++)
|
||
mmap_read_counter(&mmap_array[i][counter]);
|
||
}
|
||
}
|
||
|
||
int nr_poll;
|
||
int group_fd;
|
||
|
||
static void start_counter(int i, int counter)
|
||
{
|
||
struct perf_event_attr *attr;
|
||
int cpu;
|
||
|
||
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;
|
||
attr->inherit = (cpu < 0) && inherit;
|
||
|
||
try_again:
|
||
fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
|
||
|
||
if (fd[i][counter] < 0) {
|
||
int err = errno;
|
||
|
||
if (err == EPERM || err == EACCES)
|
||
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_EVENTS=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_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
|
||
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_BOOLEAN('i', "inherit", &inherit,
|
||
"child tasks inherit counters"),
|
||
OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
|
||
"symbol to annotate - requires -k option"),
|
||
OPT_BOOLEAN('z', "zero", &zero,
|
||
"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 __used)
|
||
{
|
||
int counter;
|
||
|
||
symbol__init();
|
||
|
||
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();
|
||
parse_source(sym_filter_entry);
|
||
|
||
/*
|
||
* 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();
|
||
}
|