perf record: Use perf_evsel__open

Now its time to factor out the mmap handling bits into the perf_evsel
class.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 113 insertions, 120 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 1614d89b4765..ec43f2eb7b72 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -72,8 +72,6 @@ static struct perf_evlist	*evsel_list;
 static long                     samples                         =      0;
 static u64                      bytes_written                   =      0;
 
-static int                      nr_cpu                          =      0;
-
 static int                      file_new                        =      1;
 static off_t                    post_processing_offset;
 
@@ -208,8 +206,6 @@ static void sig_atexit(void)
         kill(getpid(), signr);
 }
 
-static int group_fd;
-
 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 {
         struct perf_header_attr *h_attr;
@@ -234,7 +230,6 @@ static void create_counter(struct perf_evlist *evlist,
         char *filter = evsel->filter;
         struct perf_event_attr *attr = &evsel->attr;
         struct perf_header_attr *h_attr;
-        int track = !evsel->idx; /* only the first counter needs these */
         int thread_index;
         int ret;
         struct {
@@ -243,19 +238,77 @@ static void create_counter(struct perf_evlist *evlist,
                 u64 time_running;
                 u64 id;
         } read_data;
-        /*
-         * Check if parse_single_tracepoint_event has already asked for
-         * PERF_SAMPLE_TIME.
-         *
-         * XXX this is kludgy but short term fix for problems introduced by
-         * eac23d1c that broke 'perf script' by having different sample_types
-         * when using multiple tracepoint events when we use a perf binary
-         * that tries to use sample_id_all on an older kernel.
-         *
-         * We need to move counter creation to perf_session, support
-         * different sample_types, etc.
-         */
-        bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
+
+        for (thread_index = 0; thread_index < threads->nr; thread_index++) {
+                h_attr = get_header_attr(attr, evsel->idx);
+                if (h_attr == NULL)
+                        die("nomem\n");
+
+                if (!file_new) {
+                        if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
+                                fprintf(stderr, "incompatible append\n");
+                                exit(-1);
+                        }
+                }
+
+                if (read(FD(evsel, cpu, thread_index), &read_data, sizeof(read_data)) == -1) {
+                        perror("Unable to read perf file descriptor");
+                        exit(-1);
+                }
+
+                if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
+                        pr_warning("Not enough memory to add id\n");
+                        exit(-1);
+                }
+
+                assert(FD(evsel, cpu, thread_index) >= 0);
+                fcntl(FD(evsel, cpu, thread_index), F_SETFL, O_NONBLOCK);
+
+                if (evsel->idx || thread_index) {
+                        struct perf_evsel *first;
+                        first = list_entry(evlist->entries.next, struct perf_evsel, node);
+                        ret = ioctl(FD(evsel, cpu, thread_index),
+                                    PERF_EVENT_IOC_SET_OUTPUT,
+                                    FD(first, cpu, 0));
+                        if (ret) {
+                                error("failed to set output: %d (%s)\n", errno,
+                                                strerror(errno));
+                                exit(-1);
+                        }
+                } else {
+                        mmap_array[cpu].prev = 0;
+                        mmap_array[cpu].mask = mmap_pages*page_size - 1;
+                        mmap_array[cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
+                                PROT_READ | PROT_WRITE, MAP_SHARED, FD(evsel, cpu, thread_index), 0);
+                        if (mmap_array[cpu].base == MAP_FAILED) {
+                                error("failed to mmap with %d (%s)\n", errno, strerror(errno));
+                                exit(-1);
+                        }
+
+                        evlist->pollfd[evlist->nr_fds].fd = FD(evsel, cpu, thread_index);
+                        evlist->pollfd[evlist->nr_fds].events = POLLIN;
+                        evlist->nr_fds++;
+                }
+
+                if (filter != NULL) {
+                        ret = ioctl(FD(evsel, cpu, thread_index),
+                                    PERF_EVENT_IOC_SET_FILTER, filter);
+                        if (ret) {
+                                error("failed to set filter with %d (%s)\n", errno,
+                                                strerror(errno));
+                                exit(-1);
+                        }
+                }
+        }
+
+        if (!sample_type)
+                sample_type = attr->sample_type;
+}
+
+static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
+{
+        struct perf_event_attr *attr = &evsel->attr;
+        int track = !evsel->idx; /* only the first counter needs these */
 
         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
@@ -315,19 +368,39 @@ static void create_counter(struct perf_evlist *evlist,
 
         attr->mmap              = track;
         attr->comm              = track;
-        attr->inherit           = !no_inherit;
+
         if (target_pid == -1 && target_tid == -1 && !system_wide) {
                 attr->disabled = 1;
                 attr->enable_on_exec = 1;
         }
-retry_sample_id:
-        attr->sample_id_all = sample_id_all_avail ? 1 : 0;
+}
 
-        for (thread_index = 0; thread_index < threads->nr; thread_index++) {
-try_again:
-                FD(evsel, nr_cpu, thread_index) = sys_perf_event_open(attr, threads->map[thread_index], cpu, group_fd, 0);
+static void open_counters(struct perf_evlist *evlist)
+{
+        struct perf_evsel *pos;
+        int cpu;
+
+        list_for_each_entry(pos, &evlist->entries, node) {
+                struct perf_event_attr *attr = &pos->attr;
+                /*
+                 * Check if parse_single_tracepoint_event has already asked for
+                 * PERF_SAMPLE_TIME.
+                 *
+                 * XXX this is kludgy but short term fix for problems introduced by
+                 * eac23d1c that broke 'perf script' by having different sample_types
+                 * when using multiple tracepoint events when we use a perf binary
+                 * that tries to use sample_id_all on an older kernel.
+                 *
+                 * We need to move counter creation to perf_session, support
+                 * different sample_types, etc.
+                 */
+                bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
 
-                if (FD(evsel, nr_cpu, thread_index) < 0) {
+                config_attr(pos, evlist);
+retry_sample_id:
+                attr->sample_id_all = sample_id_all_avail ? 1 : 0;
+try_again:
+                if (perf_evsel__open(pos, cpus, threads, group, !no_inherit) < 0) {
                         int err = errno;
 
                         if (err == EPERM || err == EACCES)
@@ -364,7 +437,7 @@ try_again:
                         }
                         printf("\n");
                         error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
-                              FD(evsel, nr_cpu, thread_index), strerror(err));
+                              err, strerror(err));
 
 #if defined(__i386__) || defined(__x86_64__)
                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
@@ -375,90 +448,13 @@ try_again:
 #endif
 
                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
-                        exit(-1);
-                }
-
-                h_attr = get_header_attr(attr, evsel->idx);
-                if (h_attr == NULL)
-                        die("nomem\n");
-
-                if (!file_new) {
-                        if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
-                                fprintf(stderr, "incompatible append\n");
-                                exit(-1);
-                        }
-                }
-
-                if (read(FD(evsel, nr_cpu, thread_index), &read_data, sizeof(read_data)) == -1) {
-                        perror("Unable to read perf file descriptor");
-                        exit(-1);
-                }
-
-                if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
-                        pr_warning("Not enough memory to add id\n");
-                        exit(-1);
-                }
-
-                assert(FD(evsel, nr_cpu, thread_index) >= 0);
-                fcntl(FD(evsel, nr_cpu, thread_index), F_SETFL, O_NONBLOCK);
-
-                /*
-                 * First counter acts as the group leader:
-                 */
-                if (group && group_fd == -1)
-                        group_fd = FD(evsel, nr_cpu, thread_index);
-
-                if (evsel->idx || thread_index) {
-                        struct perf_evsel *first;
-                        first = list_entry(evlist->entries.next, struct perf_evsel, node);
-                        ret = ioctl(FD(evsel, nr_cpu, thread_index),
-                                    PERF_EVENT_IOC_SET_OUTPUT,
-                                    FD(first, nr_cpu, 0));
-                        if (ret) {
-                                error("failed to set output: %d (%s)\n", errno,
-                                                strerror(errno));
-                                exit(-1);
-                        }
-                } else {
-                        mmap_array[nr_cpu].prev = 0;
-                        mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
-                        mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
-                                PROT_READ | PROT_WRITE, MAP_SHARED, FD(evsel, nr_cpu, thread_index), 0);
-                        if (mmap_array[nr_cpu].base == MAP_FAILED) {
-                                error("failed to mmap with %d (%s)\n", errno, strerror(errno));
-                                exit(-1);
-                        }
-
-                        evlist->pollfd[evlist->nr_fds].fd = FD(evsel, nr_cpu, thread_index);
-                        evlist->pollfd[evlist->nr_fds].events = POLLIN;
-                        evlist->nr_fds++;
-                }
-
-                if (filter != NULL) {
-                        ret = ioctl(FD(evsel, nr_cpu, thread_index),
-                                    PERF_EVENT_IOC_SET_FILTER, filter);
-                        if (ret) {
-                                error("failed to set filter with %d (%s)\n", errno,
-                                                strerror(errno));
-                                exit(-1);
-                        }
                 }
         }
 
-        if (!sample_type)
-                sample_type = attr->sample_type;
-}
-
-static void open_counters(struct perf_evlist *evlist, int cpu)
-{
-        struct perf_evsel *pos;
-
-        group_fd = -1;
-
-        list_for_each_entry(pos, &evlist->entries, node)
-                create_counter(evlist, pos, cpu);
-
-        nr_cpu++;
+        for (cpu = 0; cpu < cpus->nr; ++cpu) {
+                list_for_each_entry(pos, &evlist->entries, node)
+                        create_counter(evlist, pos, cpu);
+        }
 }
 
 static int process_buildids(void)
@@ -533,7 +529,7 @@ static void mmap_read_all(void)
 {
         int i;
 
-        for (i = 0; i < nr_cpu; i++) {
+        for (i = 0; i < cpus->nr; i++) {
                 if (mmap_array[i].base)
                         mmap_read(&mmap_array[i]);
         }
@@ -673,12 +669,7 @@ static int __cmd_record(int argc, const char **argv)
                 close(child_ready_pipe[0]);
         }
 
-        if (!system_wide && no_inherit && !cpu_list) {
-                open_counters(evsel_list, -1);
-        } else {
-                for (i = 0; i < cpus->nr; i++)
-                        open_counters(evsel_list, cpus->map[i]);
-        }
+        open_counters(evsel_list);
 
         perf_session__set_sample_type(session, sample_type);
 
@@ -795,7 +786,7 @@ static int __cmd_record(int argc, const char **argv)
                 }
 
                 if (done) {
-                        for (i = 0; i < nr_cpu; i++) {
+                        for (i = 0; i < cpus->nr; i++) {
                                 struct perf_evsel *pos;
 
                                 list_for_each_entry(pos, &evsel_list->entries, node) {
@@ -933,11 +924,13 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
                 usage_with_options(record_usage, record_options);
         }
 
-        cpus = cpu_map__new(cpu_list);
-        if (cpus == NULL) {
-                perror("failed to parse CPUs map");
-                return -1;
-        }
+        if (target_tid != -1)
+                cpus = cpu_map__dummy_new();
+        else
+                cpus = cpu_map__new(cpu_list);
+
+        if (cpus == NULL)
+                usage_with_options(record_usage, record_options);
 
         list_for_each_entry(pos, &evsel_list->entries, node) {
                 if (perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0)