1 files changed, 182 insertions, 240 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 108b0db7bbe..5a72d421e21 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 
 #include "evlist.h"
+#include "evsel.h"
 #include "util.h"
 #include "header.h"
 #include "../perf.h"
@@ -19,89 +20,6 @@
 
 static bool no_buildid_cache = false;
 
-/*
- * Create new perf.data header attribute:
- */
-struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
-{
-        struct perf_header_attr *self = malloc(sizeof(*self));
-
-        if (self != NULL) {
-                self->attr = *attr;
-                self->ids  = 0;
-                self->size = 1;
-                self->id   = malloc(sizeof(u64));
-                if (self->id == NULL) {
-                        free(self);
-                        self = NULL;
-                }
-        }
-
-        return self;
-}
-
-void perf_header_attr__delete(struct perf_header_attr *self)
-{
-        free(self->id);
-        free(self);
-}
-
-int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
-{
-        int pos = self->ids;
-
-        self->ids++;
-        if (self->ids > self->size) {
-                int nsize = self->size * 2;
-                u64 *nid = realloc(self->id, nsize * sizeof(u64));
-
-                if (nid == NULL)
-                        return -1;
-
-                self->size = nsize;
-                self->id = nid;
-        }
-        self->id[pos] = id;
-        return 0;
-}
-
-int perf_header__init(struct perf_header *self)
-{
-        self->size = 1;
-        self->attr = malloc(sizeof(void *));
-        return self->attr == NULL ? -ENOMEM : 0;
-}
-
-void perf_header__exit(struct perf_header *self)
-{
-        int i;
-        for (i = 0; i < self->attrs; ++i)
-                perf_header_attr__delete(self->attr[i]);
-        free(self->attr);
-}
-
-int perf_header__add_attr(struct perf_header *self,
-                          struct perf_header_attr *attr)
-{
-        if (self->frozen)
-                return -1;
-
-        if (self->attrs == self->size) {
-                int nsize = self->size * 2;
-                struct perf_header_attr **nattr;
-
-                nattr = realloc(self->attr, nsize * sizeof(void *));
-                if (nattr == NULL)
-                        return -1;
-
-                self->size = nsize;
-                self->attr = nattr;
-        }
-
-        self->attr[self->attrs++] = attr;
-        return 0;
-}
-
 static int event_count;
 static struct perf_trace_event_type *events;
 
@@ -148,19 +66,19 @@ struct perf_file_attr {
         struct perf_file_section        ids;
 };
 
-void perf_header__set_feat(struct perf_header *self, int feat)
+void perf_header__set_feat(struct perf_header *header, int feat)
 {
-        set_bit(feat, self->adds_features);
+        set_bit(feat, header->adds_features);
 }
 
-void perf_header__clear_feat(struct perf_header *self, int feat)
+void perf_header__clear_feat(struct perf_header *header, int feat)
 {
-        clear_bit(feat, self->adds_features);
+        clear_bit(feat, header->adds_features);
 }
 
-bool perf_header__has_feat(const struct perf_header *self, int feat)
+bool perf_header__has_feat(const struct perf_header *header, int feat)
 {
-        return test_bit(feat, self->adds_features);
+        return test_bit(feat, header->adds_features);
 }
 
 static int do_write(int fd, const void *buf, size_t size)
@@ -229,22 +147,22 @@ static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
         return 0;
 }
 
-static int machine__write_buildid_table(struct machine *self, int fd)
+static int machine__write_buildid_table(struct machine *machine, int fd)
 {
         int err;
         u16 kmisc = PERF_RECORD_MISC_KERNEL,
             umisc = PERF_RECORD_MISC_USER;
 
-        if (!machine__is_host(self)) {
+        if (!machine__is_host(machine)) {
                 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
                 umisc = PERF_RECORD_MISC_GUEST_USER;
         }
 
-        err = __dsos__write_buildid_table(&self->kernel_dsos, self->pid,
+        err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
                                           kmisc, fd);
         if (err == 0)
-                err = __dsos__write_buildid_table(&self->user_dsos,
-                                                  self->pid, umisc, fd);
+                err = __dsos__write_buildid_table(&machine->user_dsos,
+                                                  machine->pid, umisc, fd);
         return err;
 }
 
@@ -362,12 +280,12 @@ out_free:
         return err;
 }
 
-static int dso__cache_build_id(struct dso *self, const char *debugdir)
+static int dso__cache_build_id(struct dso *dso, const char *debugdir)
 {
-        bool is_kallsyms = self->kernel && self->long_name[0] != '/';
+        bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
 
-        return build_id_cache__add_b(self->build_id, sizeof(self->build_id),
-                                     self->long_name, debugdir, is_kallsyms);
+        return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
+                                     dso->long_name, debugdir, is_kallsyms);
 }
 
 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
@@ -382,14 +300,14 @@ static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
         return err;
 }
 
-static int machine__cache_build_ids(struct machine *self, const char *debugdir)
+static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
 {
-        int ret = __dsos__cache_build_ids(&self->kernel_dsos, debugdir);
-        ret |= __dsos__cache_build_ids(&self->user_dsos, debugdir);
+        int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
+        ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
         return ret;
 }
 
-static int perf_session__cache_build_ids(struct perf_session *self)
+static int perf_session__cache_build_ids(struct perf_session *session)
 {
         struct rb_node *nd;
         int ret;
@@ -400,28 +318,28 @@ static int perf_session__cache_build_ids(struct perf_session *self)
         if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
                 return -1;
 
-        ret = machine__cache_build_ids(&self->host_machine, debugdir);
+        ret = machine__cache_build_ids(&session->host_machine, debugdir);
 
-        for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
+        for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
                 ret |= machine__cache_build_ids(pos, debugdir);
         }
         return ret ? -1 : 0;
 }
 
-static bool machine__read_build_ids(struct machine *self, bool with_hits)
+static bool machine__read_build_ids(struct machine *machine, bool with_hits)
 {
-        bool ret = __dsos__read_build_ids(&self->kernel_dsos, with_hits);
-        ret |= __dsos__read_build_ids(&self->user_dsos, with_hits);
+        bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
+        ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
         return ret;
 }
 
-static bool perf_session__read_build_ids(struct perf_session *self, bool with_hits)
+static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 {
         struct rb_node *nd;
-        bool ret = machine__read_build_ids(&self->host_machine, with_hits);
+        bool ret = machine__read_build_ids(&session->host_machine, with_hits);
 
-        for (nd = rb_first(&self->machines); nd; nd = rb_next(nd)) {
+        for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
                 ret |= machine__read_build_ids(pos, with_hits);
         }
@@ -429,7 +347,7 @@ static bool perf_session__read_build_ids(struct perf_session *self, bool with_hi
         return ret;
 }
 
-static int perf_header__adds_write(struct perf_header *self,
+static int perf_header__adds_write(struct perf_header *header,
                                    struct perf_evlist *evlist, int fd)
 {
         int nr_sections;
@@ -439,13 +357,13 @@ static int perf_header__adds_write(struct perf_header *self,
         u64 sec_start;
         int idx = 0, err;
 
-        session = container_of(self, struct perf_session, header);
+        session = container_of(header, struct perf_session, header);
 
-        if (perf_header__has_feat(self, HEADER_BUILD_ID &&
+        if (perf_header__has_feat(header, HEADER_BUILD_ID &&
             !perf_session__read_build_ids(session, true)))
-                perf_header__clear_feat(self, HEADER_BUILD_ID);
+                perf_header__clear_feat(header, HEADER_BUILD_ID);
 
-        nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
+        nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
         if (!nr_sections)
                 return 0;
 
@@ -455,10 +373,10 @@ static int perf_header__adds_write(struct perf_header *self,
 
         sec_size = sizeof(*feat_sec) * nr_sections;
 
-        sec_start = self->data_offset + self->data_size;
+        sec_start = header->data_offset + header->data_size;
         lseek(fd, sec_start + sec_size, SEEK_SET);
 
-        if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
+        if (perf_header__has_feat(header, HEADER_TRACE_INFO)) {
                 struct perf_file_section *trace_sec;
 
                 trace_sec = &feat_sec[idx++];
@@ -469,14 +387,14 @@ static int perf_header__adds_write(struct perf_header *self,
                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
         }
 
-        if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
+        if (perf_header__has_feat(header, HEADER_BUILD_ID)) {
                 struct perf_file_section *buildid_sec;
 
                 buildid_sec = &feat_sec[idx++];
 
                 /* Write build-ids */
                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
-                err = dsos__write_buildid_table(self, fd);
+                err = dsos__write_buildid_table(header, fd);
                 if (err < 0) {
                         pr_debug("failed to write buildid table\n");
                         goto out_free;
@@ -515,33 +433,41 @@ int perf_header__write_pipe(int fd)
         return 0;
 }
 
-int perf_header__write(struct perf_header *self, struct perf_evlist *evlist,
-                       int fd, bool at_exit)
+int perf_session__write_header(struct perf_session *session,
+                               struct perf_evlist *evlist,
+                               int fd, bool at_exit)
 {
         struct perf_file_header f_header;
         struct perf_file_attr   f_attr;
-        struct perf_header_attr *attr;
-        int i, err;
+        struct perf_header *header = &session->header;
+        struct perf_evsel *attr, *pair = NULL;
+        int err;
 
         lseek(fd, sizeof(f_header), SEEK_SET);
 
-        for (i = 0; i < self->attrs; i++) {
-                attr = self->attr[i];
+        if (session->evlist != evlist)
+                pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
 
+        list_for_each_entry(attr, &evlist->entries, node) {
                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
                 if (err < 0) {
+out_err_write:
                         pr_debug("failed to write perf header\n");
                         return err;
                 }
+                if (session->evlist != evlist) {
+                        err = do_write(fd, pair->id, pair->ids * sizeof(u64));
+                        if (err < 0)
+                                goto out_err_write;
+                        attr->ids += pair->ids;
+                        pair = list_entry(pair->node.next, struct perf_evsel, node);
+                }
         }
 
+        header->attr_offset = lseek(fd, 0, SEEK_CUR);
 
-        self->attr_offset = lseek(fd, 0, SEEK_CUR);
-
-        for (i = 0; i < self->attrs; i++) {
-                attr = self->attr[i];
-
+        list_for_each_entry(attr, &evlist->entries, node) {
                 f_attr = (struct perf_file_attr){
                         .attr = attr->attr,
                         .ids  = {
@@ -556,20 +482,20 @@ int perf_header__write(struct perf_header *self, struct perf_evlist *evlist,
                 }
         }
 
-        self->event_offset = lseek(fd, 0, SEEK_CUR);
-        self->event_size = event_count * sizeof(struct perf_trace_event_type);
+        header->event_offset = lseek(fd, 0, SEEK_CUR);
+        header->event_size = event_count * sizeof(struct perf_trace_event_type);
         if (events) {
-                err = do_write(fd, events, self->event_size);
+                err = do_write(fd, events, header->event_size);
                 if (err < 0) {
                         pr_debug("failed to write perf header events\n");
                         return err;
                 }
         }
 
-        self->data_offset = lseek(fd, 0, SEEK_CUR);
+        header->data_offset = lseek(fd, 0, SEEK_CUR);
 
         if (at_exit) {
-                err = perf_header__adds_write(self, evlist, fd);
+                err = perf_header__adds_write(header, evlist, fd);
                 if (err < 0)
                         return err;
         }
@@ -579,20 +505,20 @@ int perf_header__write(struct perf_header *self, struct perf_evlist *evlist,
                 .size      = sizeof(f_header),
                 .attr_size = sizeof(f_attr),
                 .attrs = {
-                        .offset = self->attr_offset,
-                        .size   = self->attrs * sizeof(f_attr),
+                        .offset = header->attr_offset,
+                        .size   = evlist->nr_entries * sizeof(f_attr),
                 },
                 .data = {
-                        .offset = self->data_offset,
-                        .size   = self->data_size,
+                        .offset = header->data_offset,
+                        .size   = header->data_size,
                 },
                 .event_types = {
-                        .offset = self->event_offset,
-                        .size   = self->event_size,
+                        .offset = header->event_offset,
+                        .size   = header->event_size,
                 },
         };
 
-        memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
+        memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
 
         lseek(fd, 0, SEEK_SET);
         err = do_write(fd, &f_header, sizeof(f_header));
@@ -600,26 +526,26 @@ int perf_header__write(struct perf_header *self, struct perf_evlist *evlist,
                 pr_debug("failed to write perf header\n");
                 return err;
         }
-        lseek(fd, self->data_offset + self->data_size, SEEK_SET);
+        lseek(fd, header->data_offset + header->data_size, SEEK_SET);
 
-        self->frozen = 1;
+        header->frozen = 1;
         return 0;
 }
 
-static int perf_header__getbuffer64(struct perf_header *self,
+static int perf_header__getbuffer64(struct perf_header *header,
                                     int fd, void *buf, size_t size)
 {
         if (readn(fd, buf, size) <= 0)
                 return -1;
 
-        if (self->needs_swap)
+        if (header->needs_swap)
                 mem_bswap_64(buf, size);
 
         return 0;
 }
 
-int perf_header__process_sections(struct perf_header *self, int fd,
-                                  int (*process)(struct perf_file_section *self,
+int perf_header__process_sections(struct perf_header *header, int fd,
+                                  int (*process)(struct perf_file_section *section,
                                                  struct perf_header *ph,
                                                  int feat, int fd))
 {
@@ -629,7 +555,7 @@ int perf_header__process_sections(struct perf_header *self, int fd,
         int idx = 0;
         int err = -1, feat = 1;
 
-        nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
+        nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
         if (!nr_sections)
                 return 0;
 
@@ -639,17 +565,17 @@ int perf_header__process_sections(struct perf_header *self, int fd,
 
         sec_size = sizeof(*feat_sec) * nr_sections;
 
-        lseek(fd, self->data_offset + self->data_size, SEEK_SET);
+        lseek(fd, header->data_offset + header->data_size, SEEK_SET);
 
-        if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
+        if (perf_header__getbuffer64(header, fd, feat_sec, sec_size))
                 goto out_free;
 
         err = 0;
         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
-                if (perf_header__has_feat(self, feat)) {
+                if (perf_header__has_feat(header, feat)) {
                         struct perf_file_section *sec = &feat_sec[idx++];
 
-                        err = process(sec, self, feat, fd);
+                        err = process(sec, header, feat, fd);
                         if (err < 0)
                                 break;
                 }
@@ -660,35 +586,35 @@ out_free:
         return err;
 }
 
-int perf_file_header__read(struct perf_file_header *self,
+int perf_file_header__read(struct perf_file_header *header,
                            struct perf_header *ph, int fd)
 {
         lseek(fd, 0, SEEK_SET);
 
-        if (readn(fd, self, sizeof(*self)) <= 0 ||
-            memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
+        if (readn(fd, header, sizeof(*header)) <= 0 ||
+            memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
                 return -1;
 
-        if (self->attr_size != sizeof(struct perf_file_attr)) {
-                u64 attr_size = bswap_64(self->attr_size);
+        if (header->attr_size != sizeof(struct perf_file_attr)) {
+                u64 attr_size = bswap_64(header->attr_size);
 
                 if (attr_size != sizeof(struct perf_file_attr))
                         return -1;
 
-                mem_bswap_64(self, offsetof(struct perf_file_header,
+                mem_bswap_64(header, offsetof(struct perf_file_header,
                                             adds_features));
                 ph->needs_swap = true;
         }
 
-        if (self->size != sizeof(*self)) {
+        if (header->size != sizeof(*header)) {
                 /* Support the previous format */
-                if (self->size == offsetof(typeof(*self), adds_features))
-                        bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
+                if (header->size == offsetof(typeof(*header), adds_features))
+                        bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
                 else
                         return -1;
         }
 
-        memcpy(&ph->adds_features, &self->adds_features,
+        memcpy(&ph->adds_features, &header->adds_features,
                sizeof(ph->adds_features));
         /*
          * FIXME: hack that assumes that if we need swap the perf.data file
@@ -702,10 +628,10 @@ int perf_file_header__read(struct perf_file_header *self,
                 perf_header__set_feat(ph, HEADER_BUILD_ID);
         }
 
-        ph->event_offset = self->event_types.offset;
-        ph->event_size   = self->event_types.size;
-        ph->data_offset  = self->data.offset;
-        ph->data_size    = self->data.size;
+        ph->event_offset = header->event_types.offset;
+        ph->event_size   = header->event_types.size;
+        ph->data_offset  = header->data.offset;
+        ph->data_size    = header->data.size;
         return 0;
 }
 
@@ -764,11 +690,10 @@ out:
         return err;
 }
 
-static int perf_header__read_build_ids(struct perf_header *self,
-                        int input, u64 offset, u64 size)
+static int perf_header__read_build_ids(struct perf_header *header,
+                                       int input, u64 offset, u64 size)
 {
-        struct perf_session *session = container_of(self,
-                        struct perf_session, header);
+        struct perf_session *session = container_of(header, struct perf_session, header);
         struct build_id_event bev;
         char filename[PATH_MAX];
         u64 limit = offset + size;
@@ -780,7 +705,7 @@ static int perf_header__read_build_ids(struct perf_header *self,
                 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
                         goto out;
 
-                if (self->needs_swap)
+                if (header->needs_swap)
                         perf_event_header__bswap(&bev.header);
 
                 len = bev.header.size - sizeof(bev);
@@ -796,13 +721,13 @@ out:
         return err;
 }
 
-static int perf_file_section__process(struct perf_file_section *self,
+static int perf_file_section__process(struct perf_file_section *section,
                                       struct perf_header *ph,
                                       int feat, int fd)
 {
-        if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
+        if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
-                          "%d, continuing...\n", self->offset, feat);
+                          "%d, continuing...\n", section->offset, feat);
                 return 0;
         }
 
@@ -812,7 +737,7 @@ static int perf_file_section__process(struct perf_file_section *self,
                 break;
 
         case HEADER_BUILD_ID:
-                if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
+                if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
                         pr_debug("Failed to read buildids, continuing...\n");
                 break;
         default:
@@ -822,21 +747,21 @@ static int perf_file_section__process(struct perf_file_section *self,
         return 0;
 }
 
-static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
+static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
                                        struct perf_header *ph, int fd,
                                        bool repipe)
 {
-        if (readn(fd, self, sizeof(*self)) <= 0 ||
-            memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
+        if (readn(fd, header, sizeof(*header)) <= 0 ||
+            memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
                 return -1;
 
-        if (repipe && do_write(STDOUT_FILENO, self, sizeof(*self)) < 0)
+        if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
                 return -1;
 
-        if (self->size != sizeof(*self)) {
-                u64 size = bswap_64(self->size);
+        if (header->size != sizeof(*header)) {
+                u64 size = bswap_64(header->size);
 
-                if (size != sizeof(*self))
+                if (size != sizeof(*header))
                         return -1;
 
                 ph->needs_swap = true;
@@ -847,10 +772,10 @@ static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,
 
 static int perf_header__read_pipe(struct perf_session *session, int fd)
 {
-        struct perf_header *self = &session->header;
+        struct perf_header *header = &session->header;
         struct perf_pipe_file_header f_header;
 
-        if (perf_file_header__read_pipe(&f_header, self, fd,
+        if (perf_file_header__read_pipe(&f_header, header, fd,
                                         session->repipe) < 0) {
                 pr_debug("incompatible file format\n");
                 return -EINVAL;
@@ -861,18 +786,22 @@ static int perf_header__read_pipe(struct perf_session *session, int fd)
         return 0;
 }
 
-int perf_header__read(struct perf_session *session, int fd)
+int perf_session__read_header(struct perf_session *session, int fd)
 {
-        struct perf_header *self = &session->header;
+        struct perf_header *header = &session->header;
         struct perf_file_header f_header;
         struct perf_file_attr   f_attr;
         u64                     f_id;
         int nr_attrs, nr_ids, i, j;
 
+        session->evlist = perf_evlist__new(NULL, NULL);
+        if (session->evlist == NULL)
+                return -ENOMEM;
+
         if (session->fd_pipe)
                 return perf_header__read_pipe(session, fd);
 
-        if (perf_file_header__read(&f_header, self, fd) < 0) {
+        if (perf_file_header__read(&f_header, header, fd) < 0) {
                 pr_debug("incompatible file format\n");
                 return -EINVAL;
         }
@@ -881,33 +810,39 @@ int perf_header__read(struct perf_session *session, int fd)
         lseek(fd, f_header.attrs.offset, SEEK_SET);
 
         for (i = 0; i < nr_attrs; i++) {
-                struct perf_header_attr *attr;
+                struct perf_evsel *evsel;
                 off_t tmp;
 
-                if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
+                if (perf_header__getbuffer64(header, fd, &f_attr, sizeof(f_attr)))
                         goto out_errno;
 
                 tmp = lseek(fd, 0, SEEK_CUR);
+                evsel = perf_evsel__new(&f_attr.attr, i);
 
-                attr = perf_header_attr__new(&f_attr.attr);
-                if (attr == NULL)
-                         return -ENOMEM;
+                if (evsel == NULL)
+                        goto out_delete_evlist;
+                /*
+                 * Do it before so that if perf_evsel__alloc_id fails, this
+                 * entry gets purged too at perf_evlist__delete().
+                 */
+                perf_evlist__add(session->evlist, evsel);
 
                 nr_ids = f_attr.ids.size / sizeof(u64);
+                /*
+                 * We don't have the cpu and thread maps on the header, so
+                 * for allocating the perf_sample_id table we fake 1 cpu and
+                 * hattr->ids threads.
+                 */
+                if (perf_evsel__alloc_id(evsel, 1, nr_ids))
+                        goto out_delete_evlist;
+
                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 
                 for (j = 0; j < nr_ids; j++) {
-                        if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
+                        if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
                                 goto out_errno;
 
-                        if (perf_header_attr__add_id(attr, f_id) < 0) {
-                                perf_header_attr__delete(attr);
-                                return -ENOMEM;
-                        }
-                }
-                if (perf_header__add_attr(self, attr) < 0) {
-                        perf_header_attr__delete(attr);
-                        return -ENOMEM;
+                        perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
                 }
 
                 lseek(fd, tmp, SEEK_SET);
@@ -918,51 +853,52 @@ int perf_header__read(struct perf_session *session, int fd)
                 events = malloc(f_header.event_types.size);
                 if (events == NULL)
                         return -ENOMEM;
-                if (perf_header__getbuffer64(self, fd, events,
+                if (perf_header__getbuffer64(header, fd, events,
                                              f_header.event_types.size))
                         goto out_errno;
                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
         }
 
-        perf_header__process_sections(self, fd, perf_file_section__process);
+        perf_header__process_sections(header, fd, perf_file_section__process);
 
-        lseek(fd, self->data_offset, SEEK_SET);
+        lseek(fd, header->data_offset, SEEK_SET);
 
-        self->frozen = 1;
+        header->frozen = 1;
         return 0;
 out_errno:
         return -errno;
+
+out_delete_evlist:
+        perf_evlist__delete(session->evlist);
+        session->evlist = NULL;
+        return -ENOMEM;
 }
 
-u64 perf_header__sample_type(struct perf_header *header)
+u64 perf_evlist__sample_type(struct perf_evlist *evlist)
 {
+        struct perf_evsel *pos;
         u64 type = 0;
-        int i;
-
-        for (i = 0; i < header->attrs; i++) {
-                struct perf_header_attr *attr = header->attr[i];
 
+        list_for_each_entry(pos, &evlist->entries, node) {
                 if (!type)
-                        type = attr->attr.sample_type;
-                else if (type != attr->attr.sample_type)
+                        type = pos->attr.sample_type;
+                else if (type != pos->attr.sample_type)
                         die("non matching sample_type");
         }
 
         return type;
 }
 
-bool perf_header__sample_id_all(const struct perf_header *header)
+bool perf_evlist__sample_id_all(const struct perf_evlist *evlist)
 {
         bool value = false, first = true;
-        int i;
-
-        for (i = 0; i < header->attrs; i++) {
-                struct perf_header_attr *attr = header->attr[i];
+        struct perf_evsel *pos;
 
+        list_for_each_entry(pos, &evlist->entries, node) {
                 if (first) {
-                        value = attr->attr.sample_id_all;
+                        value = pos->attr.sample_id_all;
                         first = false;
-                } else if (value != attr->attr.sample_id_all)
+                } else if (value != pos->attr.sample_id_all)
                         die("non matching sample_id_all");
         }
 
@@ -1000,16 +936,13 @@ int perf_event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
         return err;
 }
 
-int perf_event__synthesize_attrs(struct perf_header *self,
-                                 perf_event__handler_t process,
-                                 struct perf_session *session)
+int perf_session__synthesize_attrs(struct perf_session *session,
+                                   perf_event__handler_t process)
 {
-        struct perf_header_attr *attr;
-        int i, err = 0;
-
-        for (i = 0; i < self->attrs; i++) {
-                attr = self->attr[i];
+        struct perf_evsel *attr;
+        int err = 0;
 
+        list_for_each_entry(attr, &session->evlist->entries, node) {
                 err = perf_event__synthesize_attr(&attr->attr, attr->ids,
                                                   attr->id, process, session);
                 if (err) {
@@ -1024,27 +957,36 @@ int perf_event__synthesize_attrs(struct perf_header *self,
 int perf_event__process_attr(union perf_event *event,
                              struct perf_session *session)
 {
-        struct perf_header_attr *attr;
         unsigned int i, ids, n_ids;
+        struct perf_evsel *evsel;
 
-        attr = perf_header_attr__new(&event->attr.attr);
-        if (attr == NULL)
+        if (session->evlist == NULL) {
+                session->evlist = perf_evlist__new(NULL, NULL);
+                if (session->evlist == NULL)
+                        return -ENOMEM;
+        }
+
+        evsel = perf_evsel__new(&event->attr.attr,
+                                session->evlist->nr_entries);
+        if (evsel == NULL)
                 return -ENOMEM;
 
+        perf_evlist__add(session->evlist, evsel);
+
         ids = event->header.size;
         ids -= (void *)&event->attr.id - (void *)event;
         n_ids = ids / sizeof(u64);
+        /*
+         * We don't have the cpu and thread maps on the header, so
+         * for allocating the perf_sample_id table we fake 1 cpu and
+         * hattr->ids threads.
+         */
+        if (perf_evsel__alloc_id(evsel, 1, n_ids))
+                return -ENOMEM;
 
         for (i = 0; i < n_ids; i++) {
-                if (perf_header_attr__add_id(attr, event->attr.id[i]) < 0) {
-                        perf_header_attr__delete(attr);
-                        return -ENOMEM;
-                }
-        }
-
-        if (perf_header__add_attr(&session->header, attr) < 0) {
-                perf_header_attr__delete(attr);
-                return -ENOMEM;
+                perf_evlist__id_add(session->evlist, evsel, 0, i,
+                                    event->attr.id[i]);
         }
 
         perf_session__update_sample_type(session);