![Stephane Eranian](/assets/img/avatar_default.png)
There are situations where there is enough information in the perf.data to process the samples. Updating the buildid cache may add unecessary overhead in terms of disk space and time (copying large elf images). A persistent option to do this already exists via the perfconfig file, simply do: [buildid] dir = /dev/null This patch provides a way to suppress builid cache updates on a per-run basis. It addds a new option, -N, to perf record. Buildids are still generated in the perf.data file. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <4c19ef89.93ecd80a.40dc.fffff8e9@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
912 lines
22 KiB
C
912 lines
22 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/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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#include <sys/mman.h>
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enum write_mode_t {
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WRITE_FORCE,
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WRITE_APPEND
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};
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static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
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static u64 user_interval = ULLONG_MAX;
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static u64 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 unsigned int user_freq = UINT_MAX;
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static int freq = 1000;
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static int output;
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static int pipe_output = 0;
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static const char *output_name = "perf.data";
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static int group = 0;
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static int realtime_prio = 0;
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static bool raw_samples = false;
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static bool system_wide = false;
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static pid_t target_pid = -1;
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static pid_t target_tid = -1;
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static pid_t *all_tids = NULL;
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static int thread_num = 0;
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static pid_t child_pid = -1;
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static bool no_inherit = false;
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static enum write_mode_t write_mode = WRITE_FORCE;
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static bool call_graph = false;
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static bool inherit_stat = false;
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static bool no_samples = false;
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static bool sample_address = false;
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static bool no_buildid = false;
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static long samples = 0;
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static u64 bytes_written = 0;
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static struct pollfd *event_array;
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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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static const char *cpu_list;
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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];
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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 advance_output(size_t size)
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{
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bytes_written += size;
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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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/*
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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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fprintf(stderr, "WARNING: failed to keep up with mmap data\n");
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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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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)
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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 thread_index;
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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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/*
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* We default some events to a 1 default interval. But keep
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* it a weak assumption overridable by the user.
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*/
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if (!attr->sample_period || (user_freq != UINT_MAX &&
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user_interval != ULLONG_MAX)) {
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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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} else {
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attr->sample_period = default_interval;
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}
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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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attr->mmap_data = track;
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}
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if (call_graph)
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attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
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if (system_wide)
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attr->sample_type |= PERF_SAMPLE_CPU;
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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 = !no_inherit;
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if (target_pid == -1 && target_tid == -1 && !system_wide) {
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attr->disabled = 1;
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attr->enable_on_exec = 1;
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}
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for (thread_index = 0; thread_index < thread_num; thread_index++) {
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try_again:
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fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
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all_tids[thread_index], cpu, group_fd, 0);
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if (fd[nr_cpu][counter][thread_index] < 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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"\t Consider tweaking"
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" /proc/sys/kernel/perf_event_paranoid.\n");
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else if (err == ENODEV && cpu_list) {
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die("No such device - did you specify"
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" an out-of-range profile CPU?\n");
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}
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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][thread_index], 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."
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" No APIC? If so then you can boot the kernel"
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" with the \"lapic\" boot parameter to"
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" 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][thread_index], &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][thread_index] >= 0);
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fcntl(fd[nr_cpu][counter][thread_index], 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][thread_index];
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if (counter || thread_index) {
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ret = ioctl(fd[nr_cpu][counter][thread_index],
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PERF_EVENT_IOC_SET_OUTPUT,
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fd[nr_cpu][0][0]);
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if (ret) {
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error("failed to set output: %d (%s)\n", errno,
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strerror(errno));
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exit(-1);
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}
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} else {
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mmap_array[nr_cpu].counter = counter;
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mmap_array[nr_cpu].prev = 0;
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mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
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mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
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PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
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if (mmap_array[nr_cpu].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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event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
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event_array[nr_poll].events = POLLIN;
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nr_poll++;
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}
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if (filter != NULL) {
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ret = ioctl(fd[nr_cpu][counter][thread_index],
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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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}
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}
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static void open_counters(int cpu)
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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);
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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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if (!pipe_output) {
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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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}
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static void event__synthesize_guest_os(struct machine *machine, void *data)
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{
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int err;
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char *guest_kallsyms;
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char path[PATH_MAX];
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struct perf_session *psession = data;
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if (machine__is_host(machine))
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return;
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/*
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*As for guest kernel when processing subcommand record&report,
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*we arrange module mmap prior to guest kernel mmap and trigger
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*a preload dso because default guest module symbols are loaded
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*from guest kallsyms instead of /lib/modules/XXX/XXX. This
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*method is used to avoid symbol missing when the first addr is
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*in module instead of in guest kernel.
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*/
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err = event__synthesize_modules(process_synthesized_event,
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psession, machine);
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if (err < 0)
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pr_err("Couldn't record guest kernel [%d]'s reference"
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" relocation symbol.\n", machine->pid);
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if (machine__is_default_guest(machine))
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guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
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else {
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sprintf(path, "%s/proc/kallsyms", machine->root_dir);
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guest_kallsyms = path;
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}
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/*
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* We use _stext for guest kernel because guest kernel's /proc/kallsyms
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* have no _text sometimes.
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*/
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err = event__synthesize_kernel_mmap(process_synthesized_event,
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psession, machine, "_text");
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if (err < 0)
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err = event__synthesize_kernel_mmap(process_synthesized_event,
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psession, machine, "_stext");
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if (err < 0)
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pr_err("Couldn't record guest kernel [%d]'s reference"
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" relocation symbol.\n", machine->pid);
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}
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static struct perf_event_header finished_round_event = {
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.size = sizeof(struct perf_event_header),
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.type = PERF_RECORD_FINISHED_ROUND,
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};
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static void mmap_read_all(void)
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{
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int i;
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for (i = 0; i < nr_cpu; i++) {
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if (mmap_array[i].base)
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mmap_read(&mmap_array[i]);
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}
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if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
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write_output(&finished_round_event, sizeof(finished_round_event));
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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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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 = argc > 0;
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char buf;
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struct machine *machine;
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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 (!strcmp(output_name, "-"))
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pipe_output = 1;
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else if (!stat(output_name, &st) && st.st_size) {
|
|
if (write_mode == WRITE_FORCE) {
|
|
char oldname[PATH_MAX];
|
|
snprintf(oldname, sizeof(oldname), "%s.old",
|
|
output_name);
|
|
unlink(oldname);
|
|
rename(output_name, oldname);
|
|
}
|
|
} else if (write_mode == WRITE_APPEND) {
|
|
write_mode = WRITE_FORCE;
|
|
}
|
|
|
|
flags = O_CREAT|O_RDWR;
|
|
if (write_mode == WRITE_APPEND)
|
|
file_new = 0;
|
|
else
|
|
flags |= O_TRUNC;
|
|
|
|
if (pipe_output)
|
|
output = STDOUT_FILENO;
|
|
else
|
|
output = open(output_name, flags, S_IRUSR | S_IWUSR);
|
|
if (output < 0) {
|
|
perror("failed to create output file");
|
|
exit(-1);
|
|
}
|
|
|
|
session = perf_session__new(output_name, O_WRONLY,
|
|
write_mode == WRITE_FORCE, false);
|
|
if (session == NULL) {
|
|
pr_err("Not enough memory for reading perf file header\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!file_new) {
|
|
err = perf_header__read(session, output);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (have_tracepoints(attrs, nr_counters))
|
|
perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
|
|
|
|
atexit(atexit_header);
|
|
|
|
if (forks) {
|
|
child_pid = fork();
|
|
if (child_pid < 0) {
|
|
perror("failed to fork");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!child_pid) {
|
|
if (pipe_output)
|
|
dup2(2, 1);
|
|
close(child_ready_pipe[0]);
|
|
close(go_pipe[1]);
|
|
fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
|
|
|
|
/*
|
|
* Do a dummy execvp to get the PLT entry resolved,
|
|
* so we avoid the resolver overhead on the real
|
|
* execvp call.
|
|
*/
|
|
execvp("", (char **)argv);
|
|
|
|
/*
|
|
* Tell the parent we're ready to go
|
|
*/
|
|
close(child_ready_pipe[1]);
|
|
|
|
/*
|
|
* Wait until the parent tells us to go.
|
|
*/
|
|
if (read(go_pipe[0], &buf, 1) == -1)
|
|
perror("unable to read pipe");
|
|
|
|
execvp(argv[0], (char **)argv);
|
|
|
|
perror(argv[0]);
|
|
exit(-1);
|
|
}
|
|
|
|
if (!system_wide && target_tid == -1 && target_pid == -1)
|
|
all_tids[0] = child_pid;
|
|
|
|
close(child_ready_pipe[1]);
|
|
close(go_pipe[0]);
|
|
/*
|
|
* wait for child to settle
|
|
*/
|
|
if (read(child_ready_pipe[0], &buf, 1) == -1) {
|
|
perror("unable to read pipe");
|
|
exit(-1);
|
|
}
|
|
close(child_ready_pipe[0]);
|
|
}
|
|
|
|
nr_cpus = read_cpu_map(cpu_list);
|
|
if (nr_cpus < 1) {
|
|
perror("failed to collect number of CPUs\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!system_wide && no_inherit && !cpu_list) {
|
|
open_counters(-1);
|
|
} else {
|
|
for (i = 0; i < nr_cpus; i++)
|
|
open_counters(cpumap[i]);
|
|
}
|
|
|
|
if (pipe_output) {
|
|
err = perf_header__write_pipe(output);
|
|
if (err < 0)
|
|
return err;
|
|
} else if (file_new) {
|
|
err = perf_header__write(&session->header, output, false);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
post_processing_offset = lseek(output, 0, SEEK_CUR);
|
|
|
|
if (pipe_output) {
|
|
err = event__synthesize_attrs(&session->header,
|
|
process_synthesized_event,
|
|
session);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize attrs.\n");
|
|
return err;
|
|
}
|
|
|
|
err = event__synthesize_event_types(process_synthesized_event,
|
|
session);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize event_types.\n");
|
|
return err;
|
|
}
|
|
|
|
if (have_tracepoints(attrs, nr_counters)) {
|
|
/*
|
|
* FIXME err <= 0 here actually means that
|
|
* there were no tracepoints so its not really
|
|
* an error, just that we don't need to
|
|
* synthesize anything. We really have to
|
|
* return this more properly and also
|
|
* propagate errors that now are calling die()
|
|
*/
|
|
err = event__synthesize_tracing_data(output, attrs,
|
|
nr_counters,
|
|
process_synthesized_event,
|
|
session);
|
|
if (err <= 0) {
|
|
pr_err("Couldn't record tracing data.\n");
|
|
return err;
|
|
}
|
|
advance_output(err);
|
|
}
|
|
}
|
|
|
|
machine = perf_session__find_host_machine(session);
|
|
if (!machine) {
|
|
pr_err("Couldn't find native kernel information.\n");
|
|
return -1;
|
|
}
|
|
|
|
err = event__synthesize_kernel_mmap(process_synthesized_event,
|
|
session, machine, "_text");
|
|
if (err < 0)
|
|
err = event__synthesize_kernel_mmap(process_synthesized_event,
|
|
session, machine, "_stext");
|
|
if (err < 0) {
|
|
pr_err("Couldn't record kernel reference relocation symbol.\n");
|
|
return err;
|
|
}
|
|
|
|
err = event__synthesize_modules(process_synthesized_event,
|
|
session, machine);
|
|
if (err < 0) {
|
|
pr_err("Couldn't record kernel reference relocation symbol.\n");
|
|
return err;
|
|
}
|
|
if (perf_guest)
|
|
perf_session__process_machines(session, event__synthesize_guest_os);
|
|
|
|
if (!system_wide)
|
|
event__synthesize_thread(target_tid, 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;
|
|
int thread;
|
|
|
|
mmap_read_all();
|
|
|
|
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++) {
|
|
for (thread = 0;
|
|
thread < thread_num;
|
|
thread++)
|
|
ioctl(fd[i][counter][thread],
|
|
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 bool force, append_file;
|
|
|
|
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 process id"),
|
|
OPT_INTEGER('t', "tid", &target_tid,
|
|
"record events on existing thread id"),
|
|
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_STRING('C', "cpu", &cpu_list, "cpu",
|
|
"list of cpus to monitor"),
|
|
OPT_BOOLEAN('f', "force", &force,
|
|
"overwrite existing data file (deprecated)"),
|
|
OPT_U64('c', "count", &user_interval, "event period to sample"),
|
|
OPT_STRING('o', "output", &output_name, "file",
|
|
"output file name"),
|
|
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
|
|
"child tasks do not inherit counters"),
|
|
OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
|
|
OPT_UINTEGER('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_INCR('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('N', "no-buildid-cache", &no_buildid,
|
|
"do not update the buildid cache"),
|
|
OPT_END()
|
|
};
|
|
|
|
int cmd_record(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
int i,j;
|
|
|
|
argc = parse_options(argc, argv, options, record_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
if (!argc && target_pid == -1 && target_tid == -1 &&
|
|
!system_wide && !cpu_list)
|
|
usage_with_options(record_usage, options);
|
|
|
|
if (force && append_file) {
|
|
fprintf(stderr, "Can't overwrite and append at the same time."
|
|
" You need to choose between -f and -A");
|
|
usage_with_options(record_usage, options);
|
|
} else if (append_file) {
|
|
write_mode = WRITE_APPEND;
|
|
} else {
|
|
write_mode = WRITE_FORCE;
|
|
}
|
|
|
|
symbol__init();
|
|
if (no_buildid)
|
|
disable_buildid_cache();
|
|
|
|
if (!nr_counters) {
|
|
nr_counters = 1;
|
|
attrs[0].type = PERF_TYPE_HARDWARE;
|
|
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
|
|
}
|
|
|
|
if (target_pid != -1) {
|
|
target_tid = target_pid;
|
|
thread_num = find_all_tid(target_pid, &all_tids);
|
|
if (thread_num <= 0) {
|
|
fprintf(stderr, "Can't find all threads of pid %d\n",
|
|
target_pid);
|
|
usage_with_options(record_usage, options);
|
|
}
|
|
} else {
|
|
all_tids=malloc(sizeof(pid_t));
|
|
if (!all_tids)
|
|
return -ENOMEM;
|
|
|
|
all_tids[0] = target_tid;
|
|
thread_num = 1;
|
|
}
|
|
|
|
for (i = 0; i < MAX_NR_CPUS; i++) {
|
|
for (j = 0; j < MAX_COUNTERS; j++) {
|
|
fd[i][j] = malloc(sizeof(int)*thread_num);
|
|
if (!fd[i][j])
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
event_array = malloc(
|
|
sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
|
|
if (!event_array)
|
|
return -ENOMEM;
|
|
|
|
if (user_interval != ULLONG_MAX)
|
|
default_interval = user_interval;
|
|
if (user_freq != UINT_MAX)
|
|
freq = user_freq;
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
return __cmd_record(argc, argv);
|
|
}
|