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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>
743 lines
16 KiB
C
743 lines
16 KiB
C
/*
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* builtin-record.c
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*
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* Builtin record command: Record the profile of a workload
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* (or a CPU, or a PID) into the perf.data output file - for
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* later analysis via perf report.
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*/
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#include "builtin.h"
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#include "perf.h"
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#include "util/util.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/string.h"
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#include "util/header.h"
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#include "util/event.h"
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#include "util/debug.h"
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#include "util/trace-event.h"
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#include <unistd.h>
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#include <sched.h>
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#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
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#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static long default_interval = 100000;
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static int nr_cpus = 0;
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static unsigned int page_size;
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static unsigned int mmap_pages = 128;
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static int freq = 0;
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static int output;
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static const char *output_name = "perf.data";
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static int group = 0;
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static unsigned int realtime_prio = 0;
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static int raw_samples = 0;
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static int system_wide = 0;
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static int profile_cpu = -1;
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static pid_t target_pid = -1;
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static pid_t child_pid = -1;
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static int inherit = 1;
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static int force = 0;
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static int append_file = 0;
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static int call_graph = 0;
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static int inherit_stat = 0;
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static int no_samples = 0;
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static int sample_address = 0;
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static int multiplex = 0;
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static int multiplex_fd = -1;
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static long samples;
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static struct timeval last_read;
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static struct timeval this_read;
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static u64 bytes_written;
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static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
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static int nr_poll;
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static int nr_cpu;
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static int file_new = 1;
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struct perf_header *header;
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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 struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
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static unsigned long mmap_read_head(struct mmap_data *md)
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{
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struct perf_event_mmap_page *pc = md->base;
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long 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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static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
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{
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struct perf_event_mmap_page *pc = md->base;
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/*
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* ensure all reads are done before we write the tail out.
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*/
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/* mb(); */
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pc->data_tail = tail;
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}
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static void write_output(void *buf, size_t size)
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{
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while (size) {
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int ret = write(output, buf, size);
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if (ret < 0)
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die("failed to write");
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size -= ret;
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buf += ret;
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bytes_written += ret;
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}
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}
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static void mmap_read(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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unsigned long size;
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void *buf;
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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 < 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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if (old != head)
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samples++;
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size = head - old;
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if ((old & md->mask) + size != (head & md->mask)) {
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buf = &data[old & md->mask];
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size = md->mask + 1 - (old & md->mask);
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old += size;
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write_output(buf, size);
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}
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buf = &data[old & md->mask];
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size = head - old;
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old += size;
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write_output(buf, size);
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md->prev = old;
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mmap_write_tail(md, old);
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}
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static volatile int done = 0;
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static volatile int signr = -1;
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static void sig_handler(int sig)
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{
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done = 1;
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signr = sig;
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}
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static void sig_atexit(void)
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{
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if (child_pid != -1)
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kill(child_pid, SIGTERM);
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if (signr == -1)
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return;
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signal(signr, SIG_DFL);
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kill(getpid(), signr);
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}
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static pid_t pid_synthesize_comm_event(pid_t pid, int full)
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{
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struct comm_event comm_ev;
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char filename[PATH_MAX];
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char bf[BUFSIZ];
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FILE *fp;
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size_t size = 0;
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DIR *tasks;
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struct dirent dirent, *next;
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pid_t tgid = 0;
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snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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/*
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* We raced with a task exiting - just return:
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*/
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if (verbose)
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fprintf(stderr, "couldn't open %s\n", filename);
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return 0;
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}
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memset(&comm_ev, 0, sizeof(comm_ev));
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while (!comm_ev.comm[0] || !comm_ev.pid) {
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if (fgets(bf, sizeof(bf), fp) == NULL)
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goto out_failure;
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if (memcmp(bf, "Name:", 5) == 0) {
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char *name = bf + 5;
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while (*name && isspace(*name))
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++name;
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size = strlen(name) - 1;
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memcpy(comm_ev.comm, name, size++);
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} else if (memcmp(bf, "Tgid:", 5) == 0) {
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char *tgids = bf + 5;
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while (*tgids && isspace(*tgids))
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++tgids;
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tgid = comm_ev.pid = atoi(tgids);
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}
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}
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comm_ev.header.type = PERF_RECORD_COMM;
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size = ALIGN(size, sizeof(u64));
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comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
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if (!full) {
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comm_ev.tid = pid;
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write_output(&comm_ev, comm_ev.header.size);
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goto out_fclose;
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}
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snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
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tasks = opendir(filename);
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while (!readdir_r(tasks, &dirent, &next) && next) {
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char *end;
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pid = strtol(dirent.d_name, &end, 10);
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if (*end)
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continue;
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comm_ev.tid = pid;
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write_output(&comm_ev, comm_ev.header.size);
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}
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closedir(tasks);
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out_fclose:
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fclose(fp);
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return tgid;
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out_failure:
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fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
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filename);
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exit(EXIT_FAILURE);
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}
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static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid)
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{
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char filename[PATH_MAX];
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FILE *fp;
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snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
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fp = fopen(filename, "r");
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if (fp == NULL) {
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/*
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* We raced with a task exiting - just return:
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*/
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if (verbose)
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fprintf(stderr, "couldn't open %s\n", filename);
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return;
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}
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while (1) {
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char bf[BUFSIZ], *pbf = bf;
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struct mmap_event mmap_ev = {
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.header = { .type = PERF_RECORD_MMAP },
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};
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int n;
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size_t size;
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if (fgets(bf, sizeof(bf), fp) == NULL)
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break;
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/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
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n = hex2u64(pbf, &mmap_ev.start);
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if (n < 0)
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continue;
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pbf += n + 1;
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n = hex2u64(pbf, &mmap_ev.len);
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if (n < 0)
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continue;
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pbf += n + 3;
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if (*pbf == 'x') { /* vm_exec */
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char *execname = strchr(bf, '/');
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/* Catch VDSO */
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if (execname == NULL)
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execname = strstr(bf, "[vdso]");
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if (execname == NULL)
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continue;
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size = strlen(execname);
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execname[size - 1] = '\0'; /* Remove \n */
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memcpy(mmap_ev.filename, execname, size);
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size = ALIGN(size, sizeof(u64));
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mmap_ev.len -= mmap_ev.start;
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mmap_ev.header.size = (sizeof(mmap_ev) -
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(sizeof(mmap_ev.filename) - size));
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mmap_ev.pid = tgid;
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mmap_ev.tid = pid;
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write_output(&mmap_ev, mmap_ev.header.size);
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}
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}
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fclose(fp);
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}
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static void synthesize_all(void)
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{
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DIR *proc;
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struct dirent dirent, *next;
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proc = opendir("/proc");
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while (!readdir_r(proc, &dirent, &next) && next) {
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char *end;
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pid_t pid, tgid;
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pid = strtol(dirent.d_name, &end, 10);
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if (*end) /* only interested in proper numerical dirents */
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continue;
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tgid = pid_synthesize_comm_event(pid, 1);
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pid_synthesize_mmap_samples(pid, tgid);
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}
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closedir(proc);
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}
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static int group_fd;
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static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
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{
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struct perf_header_attr *h_attr;
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if (nr < header->attrs) {
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h_attr = header->attr[nr];
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} else {
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h_attr = perf_header_attr__new(a);
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perf_header__add_attr(header, h_attr);
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}
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return h_attr;
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}
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static void create_counter(int counter, int cpu, pid_t pid)
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{
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struct perf_event_attr *attr = attrs + counter;
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struct perf_header_attr *h_attr;
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int track = !counter; /* only the first counter needs these */
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struct {
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u64 count;
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u64 time_enabled;
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u64 time_running;
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u64 id;
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} read_data;
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attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
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PERF_FORMAT_TOTAL_TIME_RUNNING |
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PERF_FORMAT_ID;
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attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
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if (freq) {
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attr->sample_type |= PERF_SAMPLE_PERIOD;
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attr->freq = 1;
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attr->sample_freq = freq;
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}
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if (no_samples)
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attr->sample_freq = 0;
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if (inherit_stat)
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attr->inherit_stat = 1;
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if (sample_address)
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attr->sample_type |= PERF_SAMPLE_ADDR;
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if (call_graph)
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attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
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if (raw_samples) {
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attr->sample_type |= PERF_SAMPLE_TIME;
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attr->sample_type |= PERF_SAMPLE_RAW;
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attr->sample_type |= PERF_SAMPLE_CPU;
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}
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attr->mmap = track;
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attr->comm = track;
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attr->inherit = (cpu < 0) && inherit;
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attr->disabled = 1;
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try_again:
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fd[nr_cpu][counter] = sys_perf_event_open(attr, pid, cpu, group_fd, 0);
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if (fd[nr_cpu][counter] < 0) {
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int err = errno;
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if (err == EPERM || err == EACCES)
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die("Permission error - are you root?\n");
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else if (err == ENODEV && profile_cpu != -1)
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die("No such device - did you specify an out-of-range profile CPU?\n");
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/*
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* If it's cycles then fall back to hrtimer
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* based cpu-clock-tick sw counter, which
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* is always available even if no PMU support:
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*/
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if (attr->type == PERF_TYPE_HARDWARE
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&& attr->config == PERF_COUNT_HW_CPU_CYCLES) {
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if (verbose)
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warning(" ... trying to fall back to cpu-clock-ticks\n");
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attr->type = PERF_TYPE_SOFTWARE;
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attr->config = PERF_COUNT_SW_CPU_CLOCK;
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goto try_again;
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}
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printf("\n");
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error("perfcounter syscall returned with %d (%s)\n",
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fd[nr_cpu][counter], strerror(err));
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die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
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exit(-1);
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}
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h_attr = get_header_attr(attr, counter);
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if (!file_new) {
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if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
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fprintf(stderr, "incompatible append\n");
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exit(-1);
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}
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}
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if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) {
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perror("Unable to read perf file descriptor\n");
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exit(-1);
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}
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perf_header_attr__add_id(h_attr, read_data.id);
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assert(fd[nr_cpu][counter] >= 0);
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fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
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/*
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* First counter acts as the group leader:
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*/
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if (group && group_fd == -1)
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group_fd = fd[nr_cpu][counter];
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if (multiplex && multiplex_fd == -1)
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multiplex_fd = fd[nr_cpu][counter];
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if (multiplex && fd[nr_cpu][counter] != multiplex_fd) {
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int ret;
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ret = ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
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assert(ret != -1);
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} else {
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event_array[nr_poll].fd = fd[nr_cpu][counter];
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event_array[nr_poll].events = POLLIN;
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nr_poll++;
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mmap_array[nr_cpu][counter].counter = counter;
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mmap_array[nr_cpu][counter].prev = 0;
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mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1;
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mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
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PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter], 0);
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if (mmap_array[nr_cpu][counter].base == MAP_FAILED) {
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error("failed to mmap with %d (%s)\n", errno, strerror(errno));
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exit(-1);
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}
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}
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ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE);
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}
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static void open_counters(int cpu, pid_t pid)
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{
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int counter;
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group_fd = -1;
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for (counter = 0; counter < nr_counters; counter++)
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create_counter(counter, cpu, pid);
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nr_cpu++;
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}
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|
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static void atexit_header(void)
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{
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header->data_size += bytes_written;
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|
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perf_header__write(header, output);
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}
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|
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static int __cmd_record(int argc, const char **argv)
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{
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int i, counter;
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struct stat st;
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pid_t pid = 0;
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int flags;
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int ret;
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unsigned long waking = 0;
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|
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page_size = sysconf(_SC_PAGE_SIZE);
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nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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assert(nr_cpus <= MAX_NR_CPUS);
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assert(nr_cpus >= 0);
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|
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atexit(sig_atexit);
|
|
signal(SIGCHLD, sig_handler);
|
|
signal(SIGINT, sig_handler);
|
|
|
|
if (!stat(output_name, &st) && st.st_size) {
|
|
if (!force && !append_file) {
|
|
fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
|
|
output_name);
|
|
exit(-1);
|
|
}
|
|
} else {
|
|
append_file = 0;
|
|
}
|
|
|
|
flags = O_CREAT|O_RDWR;
|
|
if (append_file)
|
|
file_new = 0;
|
|
else
|
|
flags |= O_TRUNC;
|
|
|
|
output = open(output_name, flags, S_IRUSR|S_IWUSR);
|
|
if (output < 0) {
|
|
perror("failed to create output file");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!file_new)
|
|
header = perf_header__read(output);
|
|
else
|
|
header = perf_header__new();
|
|
|
|
|
|
if (raw_samples) {
|
|
read_tracing_data(attrs, nr_counters);
|
|
} else {
|
|
for (i = 0; i < nr_counters; i++) {
|
|
if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
|
|
read_tracing_data(attrs, nr_counters);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
atexit(atexit_header);
|
|
|
|
if (!system_wide) {
|
|
pid = target_pid;
|
|
if (pid == -1)
|
|
pid = getpid();
|
|
|
|
open_counters(profile_cpu, pid);
|
|
} else {
|
|
if (profile_cpu != -1) {
|
|
open_counters(profile_cpu, target_pid);
|
|
} else {
|
|
for (i = 0; i < nr_cpus; i++)
|
|
open_counters(i, target_pid);
|
|
}
|
|
}
|
|
|
|
if (file_new)
|
|
perf_header__write(header, output);
|
|
|
|
if (!system_wide) {
|
|
pid_t tgid = pid_synthesize_comm_event(pid, 0);
|
|
pid_synthesize_mmap_samples(pid, tgid);
|
|
} else
|
|
synthesize_all();
|
|
|
|
if (target_pid == -1 && argc) {
|
|
pid = fork();
|
|
if (pid < 0)
|
|
perror("failed to fork");
|
|
|
|
if (!pid) {
|
|
if (execvp(argv[0], (char **)argv)) {
|
|
perror(argv[0]);
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
child_pid = pid;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
int hits = samples;
|
|
|
|
for (i = 0; i < nr_cpu; i++) {
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
|
if (mmap_array[i][counter].base)
|
|
mmap_read(&mmap_array[i][counter]);
|
|
}
|
|
}
|
|
|
|
if (hits == samples) {
|
|
if (done)
|
|
break;
|
|
ret = poll(event_array, nr_poll, -1);
|
|
waking++;
|
|
}
|
|
|
|
if (done) {
|
|
for (i = 0; i < nr_cpu; i++) {
|
|
for (counter = 0; counter < nr_counters; counter++)
|
|
ioctl(fd[i][counter], PERF_EVENT_IOC_DISABLE);
|
|
}
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
|
|
|
|
/*
|
|
* Approximate RIP event size: 24 bytes.
|
|
*/
|
|
fprintf(stderr,
|
|
"[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
|
|
(double)bytes_written / 1024.0 / 1024.0,
|
|
output_name,
|
|
bytes_written / 24);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const record_usage[] = {
|
|
"perf record [<options>] [<command>]",
|
|
"perf record [<options>] -- <command> [<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('p', "pid", &target_pid,
|
|
"record events on existing pid"),
|
|
OPT_INTEGER('r', "realtime", &realtime_prio,
|
|
"collect data with this RT SCHED_FIFO priority"),
|
|
OPT_BOOLEAN('R', "raw-samples", &raw_samples,
|
|
"collect raw sample records from all opened counters"),
|
|
OPT_BOOLEAN('a', "all-cpus", &system_wide,
|
|
"system-wide collection from all CPUs"),
|
|
OPT_BOOLEAN('A', "append", &append_file,
|
|
"append to the output file to do incremental profiling"),
|
|
OPT_INTEGER('C', "profile_cpu", &profile_cpu,
|
|
"CPU to profile on"),
|
|
OPT_BOOLEAN('f', "force", &force,
|
|
"overwrite existing data file"),
|
|
OPT_LONG('c', "count", &default_interval,
|
|
"event period to sample"),
|
|
OPT_STRING('o', "output", &output_name, "file",
|
|
"output file name"),
|
|
OPT_BOOLEAN('i', "inherit", &inherit,
|
|
"child tasks inherit counters"),
|
|
OPT_INTEGER('F', "freq", &freq,
|
|
"profile at this frequency"),
|
|
OPT_INTEGER('m', "mmap-pages", &mmap_pages,
|
|
"number of mmap data pages"),
|
|
OPT_BOOLEAN('g', "call-graph", &call_graph,
|
|
"do call-graph (stack chain/backtrace) recording"),
|
|
OPT_BOOLEAN('v', "verbose", &verbose,
|
|
"be more verbose (show counter open errors, etc)"),
|
|
OPT_BOOLEAN('s', "stat", &inherit_stat,
|
|
"per thread counts"),
|
|
OPT_BOOLEAN('d', "data", &sample_address,
|
|
"Sample addresses"),
|
|
OPT_BOOLEAN('n', "no-samples", &no_samples,
|
|
"don't sample"),
|
|
OPT_BOOLEAN('M', "multiplex", &multiplex,
|
|
"multiplex counter output in a single channel"),
|
|
OPT_END()
|
|
};
|
|
|
|
int cmd_record(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
int counter;
|
|
|
|
argc = parse_options(argc, argv, options, record_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
if (!argc && target_pid == -1 && !system_wide)
|
|
usage_with_options(record_usage, options);
|
|
|
|
if (!nr_counters) {
|
|
nr_counters = 1;
|
|
attrs[0].type = PERF_TYPE_HARDWARE;
|
|
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
|
|
}
|
|
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
|
if (attrs[counter].sample_period)
|
|
continue;
|
|
|
|
attrs[counter].sample_period = default_interval;
|
|
}
|
|
|
|
return __cmd_record(argc, argv);
|
|
}
|