![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Usually "_text" is enough, but I received reports that its not always available, so fallback to "_stext" for the symbol we use to check if we need to apply any relocation to all the symbols in the kernel symtab, for when, for instance, kexec is being used. Reported-by: Darren Hart <dvhltc@us.ibm.com> Reported-by: Steven Rostedt <rostedt@goodmis.org> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
730 lines
17 KiB
C
730 lines
17 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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#define _FILE_OFFSET_BITS 64
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#include "builtin.h"
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#include "perf.h"
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#include "util/build-id.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/session.h"
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#include "util/symbol.h"
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#include "util/cpumap.h"
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#include <unistd.h>
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#include <sched.h>
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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static long default_interval = 0;
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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 = 1000;
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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 = 0;
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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 = 0;
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static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
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static int nr_poll = 0;
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static int nr_cpu = 0;
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static int file_new = 1;
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static off_t post_processing_offset;
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static struct perf_session *session;
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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 int process_synthesized_event(event_t *event,
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struct perf_session *self __used)
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{
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write_output(event, event->header.size);
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return 0;
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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 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 < session->header.attrs) {
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h_attr = session->header.attr[nr];
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} else {
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h_attr = perf_header_attr__new(a);
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if (h_attr != NULL)
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if (perf_header__add_attr(&session->header, h_attr) < 0) {
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perf_header_attr__delete(h_attr);
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h_attr = NULL;
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}
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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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char *filter = filters[counter];
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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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int ret;
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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 (nr_counters > 1)
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attr->sample_type |= PERF_SAMPLE_ID;
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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 = 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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#if defined(__i386__) || defined(__x86_64__)
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if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
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die("No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.\n");
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#endif
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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 (h_attr == NULL)
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die("nomem\n");
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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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if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
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pr_warning("Not enough memory to add id\n");
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exit(-1);
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}
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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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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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if (filter != NULL) {
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ret = ioctl(fd[nr_cpu][counter],
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PERF_EVENT_IOC_SET_FILTER, filter);
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if (ret) {
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error("failed to set filter with %d (%s)\n", errno,
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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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static int process_buildids(void)
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{
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u64 size = lseek(output, 0, SEEK_CUR);
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if (size == 0)
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return 0;
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session->fd = output;
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return __perf_session__process_events(session, post_processing_offset,
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size - post_processing_offset,
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size, &build_id__mark_dso_hit_ops);
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}
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static void atexit_header(void)
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{
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session->header.data_size += bytes_written;
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process_buildids();
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perf_header__write(&session->header, output, true);
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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 err;
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unsigned long waking = 0;
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int child_ready_pipe[2], go_pipe[2];
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const bool forks = target_pid == -1 && argc > 0;
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char buf;
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page_size = sysconf(_SC_PAGE_SIZE);
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atexit(sig_atexit);
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signal(SIGCHLD, sig_handler);
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signal(SIGINT, sig_handler);
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if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
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perror("failed to create pipes");
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exit(-1);
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}
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if (!stat(output_name, &st) && st.st_size) {
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if (!force) {
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if (!append_file) {
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pr_err("Error, output file %s exists, use -A "
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"to append or -f to overwrite.\n",
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output_name);
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exit(-1);
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}
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} else {
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char oldname[PATH_MAX];
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snprintf(oldname, sizeof(oldname), "%s.old",
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output_name);
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unlink(oldname);
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rename(output_name, oldname);
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}
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} else {
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append_file = 0;
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}
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flags = O_CREAT|O_RDWR;
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if (append_file)
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file_new = 0;
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else
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flags |= O_TRUNC;
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output = open(output_name, flags, S_IRUSR|S_IWUSR);
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if (output < 0) {
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perror("failed to create output file");
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exit(-1);
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}
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session = perf_session__new(output_name, O_WRONLY, force);
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if (session == NULL) {
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pr_err("Not enough memory for reading perf file header\n");
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return -1;
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}
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if (!file_new) {
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err = perf_header__read(&session->header, output);
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if (err < 0)
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return err;
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}
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if (raw_samples) {
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perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
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} else {
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for (i = 0; i < nr_counters; i++) {
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if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
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perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
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break;
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}
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}
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}
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atexit(atexit_header);
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if (forks) {
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pid = fork();
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if (pid < 0) {
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perror("failed to fork");
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exit(-1);
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}
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if (!pid) {
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close(child_ready_pipe[0]);
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close(go_pipe[1]);
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fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
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/*
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* Do a dummy execvp to get the PLT entry resolved,
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* so we avoid the resolver overhead on the real
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* execvp call.
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*/
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execvp("", (char **)argv);
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/*
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* Tell the parent we're ready to go
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*/
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close(child_ready_pipe[1]);
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/*
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* Wait until the parent tells us to go.
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*/
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if (read(go_pipe[0], &buf, 1) == -1)
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perror("unable to read pipe");
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execvp(argv[0], (char **)argv);
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perror(argv[0]);
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exit(-1);
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}
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child_pid = pid;
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if (!system_wide)
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target_pid = pid;
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close(child_ready_pipe[1]);
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close(go_pipe[0]);
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/*
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* wait for child to settle
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*/
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if (read(child_ready_pipe[0], &buf, 1) == -1) {
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perror("unable to read pipe");
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exit(-1);
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}
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close(child_ready_pipe[0]);
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}
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if ((!system_wide && !inherit) || profile_cpu != -1) {
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open_counters(profile_cpu, target_pid);
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} else {
|
|
nr_cpus = read_cpu_map();
|
|
for (i = 0; i < nr_cpus; i++)
|
|
open_counters(cpumap[i], target_pid);
|
|
}
|
|
|
|
if (file_new) {
|
|
err = perf_header__write(&session->header, output, false);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
post_processing_offset = lseek(output, 0, SEEK_CUR);
|
|
|
|
err = event__synthesize_kernel_mmap(process_synthesized_event,
|
|
session, "_text");
|
|
if (err < 0)
|
|
err = event__synthesize_kernel_mmap(process_synthesized_event,
|
|
session, "_stext");
|
|
if (err < 0) {
|
|
pr_err("Couldn't record kernel reference relocation symbol.\n");
|
|
return err;
|
|
}
|
|
|
|
err = event__synthesize_modules(process_synthesized_event, session);
|
|
if (err < 0) {
|
|
pr_err("Couldn't record kernel reference relocation symbol.\n");
|
|
return err;
|
|
}
|
|
|
|
if (!system_wide && profile_cpu == -1)
|
|
event__synthesize_thread(target_pid, process_synthesized_event,
|
|
session);
|
|
else
|
|
event__synthesize_threads(process_synthesized_event, session);
|
|
|
|
if (realtime_prio) {
|
|
struct sched_param param;
|
|
|
|
param.sched_priority = realtime_prio;
|
|
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
|
|
pr_err("Could not set realtime priority.\n");
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Let the child rip
|
|
*/
|
|
if (forks)
|
|
close(go_pipe[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;
|
|
err = 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_CALLBACK(0, "filter", NULL, "filter",
|
|
"event filter", parse_filter),
|
|
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 && profile_cpu == -1)
|
|
usage_with_options(record_usage, options);
|
|
|
|
symbol__init();
|
|
|
|
if (!nr_counters) {
|
|
nr_counters = 1;
|
|
attrs[0].type = PERF_TYPE_HARDWARE;
|
|
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
|
|
}
|
|
|
|
/*
|
|
* User specified count overrides default frequency.
|
|
*/
|
|
if (default_interval)
|
|
freq = 0;
|
|
else if (freq) {
|
|
default_interval = freq;
|
|
} else {
|
|
fprintf(stderr, "frequency and count are zero, aborting\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
|
if (attrs[counter].sample_period)
|
|
continue;
|
|
|
|
attrs[counter].sample_period = default_interval;
|
|
}
|
|
|
|
return __cmd_record(argc, argv);
|
|
}
|