2009-04-08 15:01:31 +02:00
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2009-05-23 18:28:58 +02:00
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#include "perf.h"
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2009-05-01 18:29:57 +02:00
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#include "util/util.h"
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2009-05-26 09:17:18 +02:00
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#include "util/parse-options.h"
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2009-05-26 11:10:09 +02:00
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#include "util/parse-events.h"
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2009-05-01 18:29:57 +02:00
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2009-04-08 15:01:31 +02:00
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#include <sched.h>
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2009-05-26 09:17:18 +02:00
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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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2009-05-15 03:50:46 +02:00
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2009-04-08 15:01:31 +02:00
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static int default_interval = 100000;
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static int event_count[MAX_COUNTERS];
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2009-05-26 11:10:09 +02:00
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2009-04-08 15:01:31 +02:00
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static int fd[MAX_NR_CPUS][MAX_COUNTERS];
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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 = 16;
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static int output;
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2009-05-26 09:17:18 +02:00
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static const char *output_name = "output.perf";
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2009-04-08 15:01:31 +02:00
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static int group = 0;
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2009-05-05 17:50:27 +02:00
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static unsigned int realtime_prio = 0;
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static int system_wide = 0;
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2009-05-15 03:50:46 +02:00
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static pid_t target_pid = -1;
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2009-05-05 17:50:27 +02:00
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static int inherit = 1;
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static int nmi = 1;
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2009-04-08 15:01:31 +02:00
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const unsigned int default_count[] = {
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1000000,
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1000000,
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10000,
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10000,
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1000000,
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10000,
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};
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struct mmap_data {
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int counter;
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void *base;
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unsigned int mask;
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unsigned int prev;
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};
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static unsigned int mmap_read_head(struct mmap_data *md)
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{
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struct perf_counter_mmap_page *pc = md->base;
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int head;
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head = pc->data_head;
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rmb();
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return head;
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}
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static long events;
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static struct timeval last_read, this_read;
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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 screw up the events under us.
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*
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* If we somehow ended up ahead of the head, we got messed up.
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*
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* In either case, truncate and restart at head.
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*/
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diff = head - old;
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if (diff > md->mask / 2 || diff < 0) {
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struct timeval iv;
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unsigned long msecs;
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timersub(&this_read, &last_read, &iv);
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msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
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fprintf(stderr, "WARNING: failed to keep up with mmap data."
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" Last read %lu msecs ago.\n", msecs);
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/*
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* head points to a known good entry, start there.
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*/
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old = head;
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}
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last_read = this_read;
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if (old != head)
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events++;
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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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while (size) {
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int ret = write(output, buf, size);
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if (ret < 0) {
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perror("failed to write");
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exit(-1);
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}
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size -= ret;
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buf += ret;
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}
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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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while (size) {
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int ret = write(output, buf, size);
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if (ret < 0) {
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perror("failed to write");
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exit(-1);
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}
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size -= ret;
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buf += ret;
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}
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md->prev = old;
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}
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static volatile int done = 0;
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2009-05-05 17:50:27 +02:00
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static void sig_handler(int sig)
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2009-04-08 15:01:31 +02:00
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{
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2009-05-05 17:50:27 +02:00
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done = 1;
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2009-04-08 15:01:31 +02:00
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}
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2009-05-05 17:50:27 +02:00
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static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
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static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
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static int nr_poll;
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static int nr_cpu;
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2009-05-15 03:50:46 +02:00
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struct mmap_event {
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struct perf_event_header header;
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__u32 pid, tid;
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__u64 start;
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__u64 len;
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__u64 pgoff;
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char filename[PATH_MAX];
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};
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struct comm_event {
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struct perf_event_header header;
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__u32 pid,tid;
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char comm[16];
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};
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static pid_t pid_synthesize_comm_event(pid_t pid)
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{
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char filename[PATH_MAX];
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char bf[BUFSIZ];
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struct comm_event comm_ev;
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size_t size;
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int fd;
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snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "couldn't open %s\n", filename);
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exit(EXIT_FAILURE);
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}
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if (read(fd, bf, sizeof(bf)) < 0) {
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fprintf(stderr, "couldn't read %s\n", filename);
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exit(EXIT_FAILURE);
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}
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close(fd);
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pid_t spid, ppid;
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char state;
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char comm[18];
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memset(&comm_ev, 0, sizeof(comm_ev));
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int nr = sscanf(bf, "%d %s %c %d %d ",
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&spid, comm, &state, &ppid, &comm_ev.pid);
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if (nr != 5) {
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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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comm_ev.header.type = PERF_EVENT_COMM;
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comm_ev.tid = pid;
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size = strlen(comm);
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comm[--size] = '\0'; /* Remove the ')' at the end */
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--size; /* Remove the '(' at the begin */
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memcpy(comm_ev.comm, comm + 1, size);
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size = ALIGN(size, sizeof(uint64_t));
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comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
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int ret = write(output, &comm_ev, comm_ev.header.size);
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if (ret < 0) {
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perror("failed to write");
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exit(-1);
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}
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return comm_ev.pid;
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}
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static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid)
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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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fprintf(stderr, "couldn't open %s\n", filename);
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exit(EXIT_FAILURE);
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}
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while (1) {
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char bf[BUFSIZ];
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unsigned char vm_read, vm_write, vm_exec, vm_mayshare;
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struct mmap_event mmap_ev = {
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.header.type = PERF_EVENT_MMAP,
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};
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unsigned long ino;
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int major, minor;
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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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sscanf(bf, "%llx-%llx %c%c%c%c %llx %x:%x %lu",
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&mmap_ev.start, &mmap_ev.len,
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&vm_read, &vm_write, &vm_exec, &vm_mayshare,
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&mmap_ev.pgoff, &major, &minor, &ino);
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if (vm_exec == 'x') {
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char *execname = strrchr(bf, ' ');
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if (execname == NULL || execname[1] != '/')
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continue;
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execname += 1;
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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(uint64_t));
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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 = pgid;
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mmap_ev.tid = pid;
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if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
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perror("failed to write");
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exit(-1);
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}
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}
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}
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fclose(fp);
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}
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static void open_counters(int cpu, pid_t pid)
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2009-04-08 15:01:31 +02:00
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{
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struct perf_counter_hw_event hw_event;
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2009-05-05 17:50:27 +02:00
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int counter, group_fd;
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int track = 1;
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2009-05-15 03:50:46 +02:00
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if (pid > 0) {
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pid_t pgid = pid_synthesize_comm_event(pid);
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pid_synthesize_mmap_events(pid, pgid);
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}
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2009-05-05 17:50:27 +02:00
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group_fd = -1;
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for (counter = 0; counter < nr_counters; counter++) {
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memset(&hw_event, 0, sizeof(hw_event));
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hw_event.config = event_id[counter];
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hw_event.irq_period = event_count[counter];
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hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID;
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hw_event.nmi = nmi;
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hw_event.mmap = track;
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hw_event.comm = track;
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hw_event.inherit = (cpu < 0) && inherit;
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track = 0; // only the first counter needs these
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fd[nr_cpu][counter] =
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sys_perf_counter_open(&hw_event, 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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printf("kerneltop error: syscall returned with %d (%s)\n",
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fd[nr_cpu][counter], strerror(err));
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if (err == EPERM)
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printf("Are you root?\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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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, MAP_SHARED, fd[nr_cpu][counter], 0);
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if (mmap_array[nr_cpu][counter].base == MAP_FAILED) {
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printf("kerneltop error: failed to mmap with %d (%s)\n",
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errno, strerror(errno));
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exit(-1);
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}
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}
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nr_cpu++;
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}
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2009-05-26 09:17:18 +02:00
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static int __cmd_record(int argc, const char **argv)
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2009-05-05 17:50:27 +02:00
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{
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int i, counter;
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2009-04-08 15:01:31 +02:00
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pid_t pid;
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int ret;
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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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output = open(output_name, O_CREAT|O_RDWR, S_IRWXU);
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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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2009-05-15 03:50:46 +02:00
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if (!system_wide) {
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open_counters(-1, target_pid != -1 ? target_pid : 0);
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} else for (i = 0; i < nr_cpus; i++)
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open_counters(i, target_pid);
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2009-04-08 15:01:31 +02:00
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2009-05-05 17:50:27 +02:00
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signal(SIGCHLD, sig_handler);
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signal(SIGINT, sig_handler);
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2009-04-08 15:01:31 +02:00
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2009-05-15 03:50:46 +02:00
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if (target_pid == -1) {
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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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2009-04-08 15:01:31 +02:00
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2009-05-15 03:50:46 +02:00
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if (!pid) {
|
2009-05-26 09:17:18 +02:00
|
|
|
if (execvp(argv[0], (char **)argv)) {
|
2009-05-15 03:50:46 +02:00
|
|
|
perror(argv[0]);
|
|
|
|
exit(-1);
|
|
|
|
}
|
2009-04-08 15:01:31 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* TODO: store the current /proc/$/maps information somewhere
|
|
|
|
*/
|
|
|
|
|
|
|
|
while (!done) {
|
|
|
|
int hits = events;
|
|
|
|
|
2009-05-05 17:50:27 +02:00
|
|
|
for (i = 0; i < nr_cpu; i++) {
|
2009-04-08 15:01:31 +02:00
|
|
|
for (counter = 0; counter < nr_counters; counter++)
|
|
|
|
mmap_read(&mmap_array[i][counter]);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hits == events)
|
|
|
|
ret = poll(event_array, nr_poll, 100);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2009-05-26 09:17:18 +02:00
|
|
|
|
|
|
|
static const char * const record_usage[] = {
|
|
|
|
"perf record [<options>] <command>",
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
2009-05-26 11:10:09 +02:00
|
|
|
static char events_help_msg[EVENTS_HELP_MAX];
|
|
|
|
|
2009-05-26 09:17:18 +02:00
|
|
|
static const struct option options[] = {
|
2009-05-26 09:17:18 +02:00
|
|
|
OPT_CALLBACK('e', "event", NULL, "event",
|
2009-05-26 11:10:09 +02:00
|
|
|
events_help_msg, parse_events),
|
2009-05-26 09:17:18 +02:00
|
|
|
OPT_INTEGER('c', "count", &default_interval,
|
|
|
|
"event period to sample"),
|
|
|
|
OPT_INTEGER('m', "mmap-pages", &mmap_pages,
|
|
|
|
"number of mmap data pages"),
|
|
|
|
OPT_STRING('o', "output", &output_name, "file",
|
|
|
|
"output file name"),
|
|
|
|
OPT_BOOLEAN('i', "inherit", &inherit,
|
|
|
|
"child tasks inherit counters"),
|
|
|
|
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('a', "all-cpus", &system_wide,
|
|
|
|
"system-wide collection from all CPUs"),
|
|
|
|
OPT_END()
|
|
|
|
};
|
|
|
|
|
|
|
|
int cmd_record(int argc, const char **argv, const char *prefix)
|
|
|
|
{
|
|
|
|
int counter;
|
|
|
|
|
2009-05-26 11:10:09 +02:00
|
|
|
create_events_help(events_help_msg);
|
2009-05-26 09:17:18 +02:00
|
|
|
|
|
|
|
argc = parse_options(argc, argv, options, record_usage, 0);
|
|
|
|
if (!argc)
|
|
|
|
usage_with_options(record_usage, options);
|
|
|
|
|
|
|
|
if (!nr_counters) {
|
|
|
|
nr_counters = 1;
|
|
|
|
event_id[0] = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (counter = 0; counter < nr_counters; counter++) {
|
|
|
|
if (event_count[counter])
|
|
|
|
continue;
|
|
|
|
|
|
|
|
event_count[counter] = default_interval;
|
|
|
|
}
|
|
|
|
|
|
|
|
return __cmd_record(argc, argv);
|
|
|
|
}
|