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perf record: Allow specifying a pid to record
Allow specifying a pid instead of always fork+exec'ing a command. Because the PERF_EVENT_COMM and PERF_EVENT_MMAP events happened before we connected, we must synthesize them so that 'perf report' can get what it needs. [ Impact: add new command line option ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20090515015046.GA13664@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
Ingo Molnar
parent
5bb9efe33e
commit
1a853e3687
@ -34,6 +34,9 @@
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#include "perf.h"
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#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
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#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
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static int nr_counters = 0;
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static __u64 event_id[MAX_COUNTERS] = { };
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static int default_interval = 100000;
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@ -47,6 +50,7 @@ static char *output_name = "output.perf";
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static int group = 0;
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static unsigned int realtime_prio = 0;
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static int system_wide = 0;
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static pid_t target_pid = -1;
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static int inherit = 1;
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static int nmi = 1;
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@ -180,6 +184,7 @@ static void display_help(void)
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" -c CNT --count=CNT # event period to sample\n"
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" -m pages --mmap_pages=<pages> # number of mmap data pages\n"
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" -o file --output=<file> # output file\n"
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" -p pid --pid=<pid> # record events on existing pid\n"
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" -r prio --realtime=<prio> # use RT prio\n"
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" -s --system # system wide profiling\n"
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);
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@ -199,13 +204,14 @@ static void process_options(int argc, const char *argv[])
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{"event", required_argument, NULL, 'e'},
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{"mmap_pages", required_argument, NULL, 'm'},
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{"output", required_argument, NULL, 'o'},
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{"pid", required_argument, NULL, 'p'},
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{"realtime", required_argument, NULL, 'r'},
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{"system", no_argument, NULL, 's'},
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{"inherit", no_argument, NULL, 'i'},
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{"nmi", no_argument, NULL, 'n'},
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{NULL, 0, NULL, 0 }
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};
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int c = getopt_long(argc, argv, "+:c:e:m:o:r:sin",
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int c = getopt_long(argc, argv, "+:c:e:m:o:p:r:sin",
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long_options, &option_index);
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if (c == -1)
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break;
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@ -215,6 +221,7 @@ static void process_options(int argc, const char *argv[])
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case 'e': error = parse_events(optarg); break;
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case 'm': mmap_pages = atoi(optarg); break;
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case 'o': output_name = strdup(optarg); break;
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case 'p': target_pid = atoi(optarg); break;
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case 'r': realtime_prio = atoi(optarg); break;
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case 's': system_wide ^= 1; break;
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case 'i': inherit ^= 1; break;
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@ -223,7 +230,7 @@ static void process_options(int argc, const char *argv[])
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}
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}
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if (argc - optind == 0)
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if (argc - optind == 0 && target_pid == -1)
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error = 1;
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if (error)
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@ -350,15 +357,135 @@ 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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static void open_counters(int cpu)
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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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{
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struct perf_counter_hw_event hw_event;
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int counter, group_fd;
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int track = 1;
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pid_t pid = -1;
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if (cpu < 0)
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pid = 0;
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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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group_fd = -1;
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for (counter = 0; counter < nr_counters; counter++) {
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@ -435,22 +562,24 @@ int cmd_record(int argc, const char **argv)
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argc -= optind;
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argv += optind;
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if (!system_wide)
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open_counters(-1);
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else for (i = 0; i < nr_cpus; i++)
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open_counters(i);
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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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signal(SIGCHLD, sig_handler);
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signal(SIGINT, sig_handler);
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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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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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if (!pid) {
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if (execvp(argv[0], argv)) {
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perror(argv[0]);
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exit(-1);
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if (!pid) {
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if (execvp(argv[0], argv)) {
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perror(argv[0]);
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exit(-1);
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}
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}
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}
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