perf tools: Ask for ID PERF_SAMPLE_ info on all PERF_RECORD_ events

So that we can use -T == --timestamp, asking for PERF_SAMPLE_TIME:

  $ perf record -aT
  $ perf report -D | grep PERF_RECORD_
  <SNIP>
   3   5951915425 0x47530 [0x58]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff8138c1a2 period: 215979 cpu:3
   3   5952026879 0x47588 [0x90]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff810cb480 period: 215979 cpu:3
   3   5952059959 0x47618 [0x38]: PERF_RECORD_FORK(6853:6853):(16811:16811)
   3   5952138878 0x47650 [0x78]: PERF_RECORD_SAMPLE(IP, 1): 16811/16811: 0xffffffff811bac35 period: 431478 cpu:3
   3   5952375068 0x476c8 [0x30]: PERF_RECORD_COMM: find:6853
   3   5952395923 0x476f8 [0x50]: PERF_RECORD_MMAP 6853/6853: [0x400000(0x25000) @ 0]: /usr/bin/find
   3   5952413756 0x47748 [0xa0]: PERF_RECORD_SAMPLE(IP, 1): 6853/6853: 0xffffffff810d080f period: 859332 cpu:3
   3   5952419837 0x477e8 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44600000(0x21d000) @ 0]: /lib64/ld-2.5.so
   3   5952437929 0x47840 [0x48]: PERF_RECORD_MMAP 6853/6853: [0x7fff7e1c9000(0x1000) @ 0x7fff7e1c9000]: [vdso]
   3   5952570127 0x47888 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f46200000(0x218000) @ 0]: /lib64/libselinux.so.1
   3   5952623637 0x478e0 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44a00000(0x356000) @ 0]: /lib64/libc-2.5.so
   3   5952675720 0x47938 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f44e00000(0x204000) @ 0]: /lib64/libdl-2.5.so
   3   5952710080 0x47990 [0x58]: PERF_RECORD_MMAP 6853/6853: [0x3f45a00000(0x246000) @ 0]: /lib64/libsepol.so.1
   3   5952847802 0x479e8 [0x58]: PERF_RECORD_SAMPLE(IP, 1): 6853/6853: 0xffffffff813897f0 period: 1142536 cpu:3
  <SNIP>

First column is the cpu and the second the timestamp.

That way we can investigate problems in the event stream.

If the new perf binary is run on an older kernel, it will disable this feature
automatically.

Tested-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <1291318772-30880-5-git-send-email-acme@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 200 insertions, 85 deletions

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 34510f441975..e4cdc1ebe0fb 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -33,11 +33,10 @@ static struct sample_data synth_sample = {
         .period    = 1,
 };
 
-static pid_t event__synthesize_comm(pid_t pid, int full,
+static pid_t event__synthesize_comm(event_t *event, pid_t pid, int full,
                                     event__handler_t process,
                                     struct perf_session *session)
 {
-        event_t ev;
         char filename[PATH_MAX];
         char bf[BUFSIZ];
         FILE *fp;
@@ -58,34 +57,39 @@ out_race:
                 return 0;
         }
 
-        memset(&ev.comm, 0, sizeof(ev.comm));
-        while (!ev.comm.comm[0] || !ev.comm.pid) {
-                if (fgets(bf, sizeof(bf), fp) == NULL)
-                        goto out_failure;
+        memset(&event->comm, 0, sizeof(event->comm));
+
+        while (!event->comm.comm[0] || !event->comm.pid) {
+                if (fgets(bf, sizeof(bf), fp) == NULL) {
+                        pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
+                        goto out;
+                }
 
                 if (memcmp(bf, "Name:", 5) == 0) {
                         char *name = bf + 5;
                         while (*name && isspace(*name))
                                 ++name;
                         size = strlen(name) - 1;
-                        memcpy(ev.comm.comm, name, size++);
+                        memcpy(event->comm.comm, name, size++);
                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
                         char *tgids = bf + 5;
                         while (*tgids && isspace(*tgids))
                                 ++tgids;
-                        tgid = ev.comm.pid = atoi(tgids);
+                        tgid = event->comm.pid = atoi(tgids);
                 }
         }
 
-        ev.comm.header.type = PERF_RECORD_COMM;
+        event->comm.header.type = PERF_RECORD_COMM;
         size = ALIGN(size, sizeof(u64));
-        ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
-
+        memset(event->comm.comm + size, 0, session->id_hdr_size);
+        event->comm.header.size = (sizeof(event->comm) -
+                                (sizeof(event->comm.comm) - size) +
+                                session->id_hdr_size);
         if (!full) {
-                ev.comm.tid = pid;
+                event->comm.tid = pid;
 
-                process(&ev, &synth_sample, session);
-                goto out_fclose;
+                process(event, &synth_sample, session);
+                goto out;
         }
 
         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
@@ -100,22 +104,19 @@ out_race:
                 if (*end)
                         continue;
 
-                ev.comm.tid = pid;
+                event->comm.tid = pid;
 
-                process(&ev, &synth_sample, session);
+                process(event, &synth_sample, session);
         }
-        closedir(tasks);
 
-out_fclose:
+        closedir(tasks);
+out:
         fclose(fp);
-        return tgid;
 
-out_failure:
-        pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
-        return -1;
+        return tgid;
 }
 
-static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
+static int event__synthesize_mmap_events(event_t *event, pid_t pid, pid_t tgid,
                                          event__handler_t process,
                                          struct perf_session *session)
 {
@@ -133,29 +134,25 @@ static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
                 return -1;
         }
 
+        event->header.type = PERF_RECORD_MMAP;
+        /*
+         * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
+         */
+        event->header.misc = PERF_RECORD_MISC_USER;
+
         while (1) {
                 char bf[BUFSIZ], *pbf = bf;
-                event_t ev = {
-                        .header = {
-                                .type = PERF_RECORD_MMAP,
-                                /*
-                                 * Just like the kernel, see __perf_event_mmap
-                                 * in kernel/perf_event.c
-                                 */
-                                .misc = PERF_RECORD_MISC_USER,
-                         },
-                };
                 int n;
                 size_t size;
                 if (fgets(bf, sizeof(bf), fp) == NULL)
                         break;
 
                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
-                n = hex2u64(pbf, &ev.mmap.start);
+                n = hex2u64(pbf, &event->mmap.start);
                 if (n < 0)
                         continue;
                 pbf += n + 1;
-                n = hex2u64(pbf, &ev.mmap.len);
+                n = hex2u64(pbf, &event->mmap.len);
                 if (n < 0)
                         continue;
                 pbf += n + 3;
@@ -170,19 +167,21 @@ static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
                                 continue;
 
                         pbf += 3;
-                        n = hex2u64(pbf, &ev.mmap.pgoff);
+                        n = hex2u64(pbf, &event->mmap.pgoff);
 
                         size = strlen(execname);
                         execname[size - 1] = '\0'; /* Remove \n */
-                        memcpy(ev.mmap.filename, execname, size);
+                        memcpy(event->mmap.filename, execname, size);
                         size = ALIGN(size, sizeof(u64));
-                        ev.mmap.len -= ev.mmap.start;
-                        ev.mmap.header.size = (sizeof(ev.mmap) -
-                                               (sizeof(ev.mmap.filename) - size));
-                        ev.mmap.pid = tgid;
-                        ev.mmap.tid = pid;
-
-                        process(&ev, &synth_sample, session);
+                        event->mmap.len -= event->mmap.start;
+                        event->mmap.header.size = (sizeof(event->mmap) -
+                                                (sizeof(event->mmap.filename) - size));
+                        memset(event->mmap.filename + size, 0, session->id_hdr_size);
+                        event->mmap.header.size += session->id_hdr_size;
+                        event->mmap.pid = tgid;
+                        event->mmap.tid = pid;
+
+                        process(event, &synth_sample, session);
                 }
         }
 
@@ -196,20 +195,27 @@ int event__synthesize_modules(event__handler_t process,
 {
         struct rb_node *nd;
         struct map_groups *kmaps = &machine->kmaps;
-        u16 misc;
+        event_t *event = zalloc(sizeof(event->mmap) + session->id_hdr_size);
+
+        if (event == NULL) {
+                pr_debug("Not enough memory synthesizing mmap event "
+                         "for kernel modules\n");
+                return -1;
+        }
+
+        event->header.type = PERF_RECORD_MMAP;
 
         /*
          * kernel uses 0 for user space maps, see kernel/perf_event.c
          * __perf_event_mmap
          */
         if (machine__is_host(machine))
-                misc = PERF_RECORD_MISC_KERNEL;
+                event->header.misc = PERF_RECORD_MISC_KERNEL;
         else
-                misc = PERF_RECORD_MISC_GUEST_KERNEL;
+                event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 
         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
              nd; nd = rb_next(nd)) {
-                event_t ev;
                 size_t size;
                 struct map *pos = rb_entry(nd, struct map, rb_node);
 
@@ -217,39 +223,78 @@ int event__synthesize_modules(event__handler_t process,
                         continue;
 
                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
-                memset(&ev, 0, sizeof(ev));
-                ev.mmap.header.misc = misc;
-                ev.mmap.header.type = PERF_RECORD_MMAP;
-                ev.mmap.header.size = (sizeof(ev.mmap) -
-                                        (sizeof(ev.mmap.filename) - size));
-                ev.mmap.start = pos->start;
-                ev.mmap.len   = pos->end - pos->start;
-                ev.mmap.pid   = machine->pid;
-
-                memcpy(ev.mmap.filename, pos->dso->long_name,
+                event->mmap.header.type = PERF_RECORD_MMAP;
+                event->mmap.header.size = (sizeof(event->mmap) -
+                                        (sizeof(event->mmap.filename) - size));
+                memset(event->mmap.filename + size, 0, session->id_hdr_size);
+                event->mmap.header.size += session->id_hdr_size;
+                event->mmap.start = pos->start;
+                event->mmap.len   = pos->end - pos->start;
+                event->mmap.pid   = machine->pid;
+
+                memcpy(event->mmap.filename, pos->dso->long_name,
                        pos->dso->long_name_len + 1);
-                process(&ev, &synth_sample, session);
+                process(event, &synth_sample, session);
         }
 
+        free(event);
         return 0;
 }
 
-int event__synthesize_thread(pid_t pid, event__handler_t process,
-                             struct perf_session *session)
+static int __event__synthesize_thread(event_t *comm_event, event_t *mmap_event,
+                                      pid_t pid, event__handler_t process,
+                                      struct perf_session *session)
 {
-        pid_t tgid = event__synthesize_comm(pid, 1, process, session);
+        pid_t tgid = event__synthesize_comm(comm_event, pid, 1, process,
+                                            session);
         if (tgid == -1)
                 return -1;
-        return event__synthesize_mmap_events(pid, tgid, process, session);
+        return event__synthesize_mmap_events(mmap_event, pid, tgid,
+                                             process, session);
 }
 
-void event__synthesize_threads(event__handler_t process,
-                               struct perf_session *session)
+int event__synthesize_thread(pid_t pid, event__handler_t process,
+                             struct perf_session *session)
+{
+        event_t *comm_event, *mmap_event;
+        int err = -1;
+
+        comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
+        if (comm_event == NULL)
+                goto out;
+
+        mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
+        if (mmap_event == NULL)
+                goto out_free_comm;
+
+        err = __event__synthesize_thread(comm_event, mmap_event, pid,
+                                         process, session);
+        free(mmap_event);
+out_free_comm:
+        free(comm_event);
+out:
+        return err;
+}
+
+int event__synthesize_threads(event__handler_t process,
+                              struct perf_session *session)
 {
         DIR *proc;
         struct dirent dirent, *next;
+        event_t *comm_event, *mmap_event;
+        int err = -1;
+
+        comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
+        if (comm_event == NULL)
+                goto out;
+
+        mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
+        if (mmap_event == NULL)
+                goto out_free_comm;
 
         proc = opendir("/proc");
+        if (proc == NULL)
+                goto out_free_mmap;
 
         while (!readdir_r(proc, &dirent, &next) && next) {
                 char *end;
@@ -258,10 +303,18 @@ void event__synthesize_threads(event__handler_t process,
                 if (*end) /* only interested in proper numerical dirents */
                         continue;
 
-                event__synthesize_thread(pid, process, session);
+                __event__synthesize_thread(comm_event, mmap_event, pid,
+                                           process, session);
         }
 
         closedir(proc);
+        err = 0;
+out_free_mmap:
+        free(mmap_event);
+out_free_comm:
+        free(comm_event);
+out:
+        return err;
 }
 
 struct process_symbol_args {
@@ -295,18 +348,20 @@ int event__synthesize_kernel_mmap(event__handler_t process,
         char path[PATH_MAX];
         char name_buff[PATH_MAX];
         struct map *map;
-
-        event_t ev = {
-                .header = {
-                        .type = PERF_RECORD_MMAP,
-                },
-        };
+        int err;
         /*
          * We should get this from /sys/kernel/sections/.text, but till that is
          * available use this, and after it is use this as a fallback for older
          * kernels.
          */
         struct process_symbol_args args = { .name = symbol_name, };
+        event_t *event = zalloc(sizeof(event->mmap) + session->id_hdr_size);
+
+        if (event == NULL) {
+                pr_debug("Not enough memory synthesizing mmap event "
+                         "for kernel modules\n");
+                return -1;
+        }
 
         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
         if (machine__is_host(machine)) {
@@ -314,10 +369,10 @@ int event__synthesize_kernel_mmap(event__handler_t process,
                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
                  * see kernel/perf_event.c __perf_event_mmap
                  */
-                ev.header.misc = PERF_RECORD_MISC_KERNEL;
+                event->header.misc = PERF_RECORD_MISC_KERNEL;
                 filename = "/proc/kallsyms";
         } else {
-                ev.header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
+                event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
                 if (machine__is_default_guest(machine))
                         filename = (char *) symbol_conf.default_guest_kallsyms;
                 else {
@@ -330,17 +385,21 @@ int event__synthesize_kernel_mmap(event__handler_t process,
                 return -ENOENT;
 
         map = machine->vmlinux_maps[MAP__FUNCTION];
-        size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
+        size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
                         "%s%s", mmap_name, symbol_name) + 1;
         size = ALIGN(size, sizeof(u64));
-        ev.mmap.header.size = (sizeof(ev.mmap) -
-                        (sizeof(ev.mmap.filename) - size));
-        ev.mmap.pgoff = args.start;
-        ev.mmap.start = map->start;
-        ev.mmap.len   = map->end - ev.mmap.start;
-        ev.mmap.pid   = machine->pid;
-
-        return process(&ev, &synth_sample, session);
+        event->mmap.header.type = PERF_RECORD_MMAP;
+        event->mmap.header.size = (sizeof(event->mmap) -
+                        (sizeof(event->mmap.filename) - size) + session->id_hdr_size);
+        event->mmap.pgoff = args.start;
+        event->mmap.start = map->start;
+        event->mmap.len   = map->end - event->mmap.start;
+        event->mmap.pid   = machine->pid;
+
+        err = process(event, &synth_sample, session);
+        free(event);
+
+        return err;
 }
 
 static void thread__comm_adjust(struct thread *self, struct hists *hists)
@@ -756,9 +815,65 @@ out_filtered:
         return 0;
 }
 
-int event__parse_sample(const event_t *event, u64 type, struct sample_data *data)
+static int event__parse_id_sample(const event_t *event,
+                                  struct perf_session *session,
+                                  struct sample_data *sample)
 {
-        const u64 *array = event->sample.array;
+        const u64 *array;
+        u64 type;
+
+        sample->cpu = sample->pid = sample->tid = -1;
+        sample->stream_id = sample->id = sample->time = -1ULL;
+
+        if (!session->sample_id_all)
+                return 0;
+
+        array = event->sample.array;
+        array += ((event->header.size -
+                   sizeof(event->header)) / sizeof(u64)) - 1;
+        type = session->sample_type;
+
+        if (type & PERF_SAMPLE_CPU) {
+                u32 *p = (u32 *)array;
+                sample->cpu = *p;
+                array--;
+        }
+
+        if (type & PERF_SAMPLE_STREAM_ID) {
+                sample->stream_id = *array;
+                array--;
+        }
+
+        if (type & PERF_SAMPLE_ID) {
+                sample->id = *array;
+                array--;
+        }
+
+        if (type & PERF_SAMPLE_TIME) {
+                sample->time = *array;
+                array--;
+        }
+
+        if (type & PERF_SAMPLE_TID) {
+                u32 *p = (u32 *)array;
+                sample->pid = p[0];
+                sample->tid = p[1];
+        }
+
+        return 0;
+}
+
+int event__parse_sample(const event_t *event, struct perf_session *session,
+                        struct sample_data *data)
+{
+        const u64 *array;
+        u64 type;
+
+        if (event->header.type != PERF_RECORD_SAMPLE)
+                return event__parse_id_sample(event, session, data);
+
+        array = event->sample.array;
+        type = session->sample_type;
 
         if (type & PERF_SAMPLE_IP) {
                 data->ip = event->ip.ip;