perf record: Stop intercepting events, use postprocessing to get build-ids

We want to stream events as fast as possible to perf.data, and
also in the future we want to have splice working, when no
interception will be possible.

Using build_id__mark_dso_hit_ops to create the list of DSOs that
back MMAPs we also optimize disk usage in the build-id cache by
only caching DSOs that had hits.

Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1265223128-11786-6-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 73 insertions, 53 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 949167efa1e..706f00196b8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -12,6 +12,7 @@
 
 #include "perf.h"
 
+#include "util/build-id.h"
 #include "util/util.h"
 #include "util/parse-options.h"
 #include "util/parse-events.h"
@@ -65,6 +66,7 @@ static int			nr_poll				=      0;
 static int                      nr_cpu                          =      0;
 
 static int                      file_new                        =      1;
+static off_t                    post_processing_offset;
 
 static struct perf_session      *session;
 
@@ -114,26 +116,10 @@ static void write_output(void *buf, size_t size)
         }
 }
 
-static void write_event(event_t *buf, size_t size)
-{
-        /*
-        * Add it to the list of DSOs, so that when we finish this
-         * record session we can pick the available build-ids.
-         */
-        if (buf->header.type == PERF_RECORD_MMAP) {
-                struct list_head *head = &dsos__user;
-                if (buf->mmap.header.misc == 1)
-                        head = &dsos__kernel;
-                __dsos__findnew(head, buf->mmap.filename);
-        }
-
-        write_output(buf, size);
-}
-
 static int process_synthesized_event(event_t *event,
                                      struct perf_session *self __used)
 {
-        write_event(event, event->header.size);
+        write_output(event, event->header.size);
         return 0;
 }
 
@@ -185,14 +171,14 @@ static void mmap_read(struct mmap_data *md)
                 size = md->mask + 1 - (old & md->mask);
                 old += size;
 
-                write_event(buf, size);
+                write_output(buf, size);
         }
 
         buf = &data[old & md->mask];
         size = head - old;
         old += size;
 
-        write_event(buf, size);
+        write_output(buf, size);
 
         md->prev = old;
         mmap_write_tail(md, old);
@@ -402,10 +388,21 @@ static void open_counters(int cpu, pid_t pid)
         nr_cpu++;
 }
 
+static int process_buildids(void)
+{
+        u64 size = lseek(output, 0, SEEK_CUR);
+
+        session->fd = output;
+        return __perf_session__process_events(session, post_processing_offset,
+                                              size - post_processing_offset,
+                                              size, &build_id__mark_dso_hit_ops);
+}
+
 static void atexit_header(void)
 {
         session->header.data_size += bytes_written;
 
+        process_buildids();
         perf_header__write(&session->header, output, true);
 }
 
@@ -558,6 +555,8 @@ static int __cmd_record(int argc, const char **argv)
                         return err;
         }
 
+        post_processing_offset = lseek(output, 0, SEEK_CUR);
+
         err = event__synthesize_kernel_mmap(process_synthesized_event,
                                             session, "_text");
         if (err < 0) {
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ed3efd728b4..d5facd5ab1f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -205,8 +205,11 @@ static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)
         dsos__for_each_with_build_id(pos, head) {
                 int err;
                 struct build_id_event b;
-                size_t len = pos->long_name_len + 1;
+                size_t len;
 
+                if (!pos->hit)
+                        continue;
+                len = pos->long_name_len + 1;
                 len = ALIGN(len, NAME_ALIGN);
                 memset(&b, 0, sizeof(b));
                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
@@ -371,7 +374,7 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
         u64 sec_start;
         int idx = 0, err;
 
-        if (dsos__read_build_ids())
+        if (dsos__read_build_ids(true))
                 perf_header__set_feat(self, HEADER_BUILD_ID);
 
         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index aa8a03120bb..74cbc64a3a3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -385,8 +385,9 @@ static struct thread *perf_session__register_idle_thread(struct perf_session *se
         return thread;
 }
 
-int perf_session__process_events(struct perf_session *self,
-                                 struct perf_event_ops *ops)
+int __perf_session__process_events(struct perf_session *self,
+                                   u64 data_offset, u64 data_size,
+                                   u64 file_size, struct perf_event_ops *ops)
 {
         int err, mmap_prot, mmap_flags;
         u64 head, shift;
@@ -396,32 +397,11 @@ int perf_session__process_events(struct perf_session *self,
         uint32_t size;
         char *buf;
 
-        if (perf_session__register_idle_thread(self) == NULL)
-                return -ENOMEM;
-
         perf_event_ops__fill_defaults(ops);
 
         page_size = sysconf(_SC_PAGESIZE);
 
-        head = self->header.data_offset;
-
-        if (!symbol_conf.full_paths) {
-                char bf[PATH_MAX];
-
-                if (getcwd(bf, sizeof(bf)) == NULL) {
-                        err = -errno;
-out_getcwd_err:
-                        pr_err("failed to get the current directory\n");
-                        goto out_err;
-                }
-                self->cwd = strdup(bf);
-                if (self->cwd == NULL) {
-                        err = -ENOMEM;
-                        goto out_getcwd_err;
-                }
-                self->cwdlen = strlen(self->cwd);
-        }
-
+        head = data_offset;
         shift = page_size * (head / page_size);
         offset += shift;
         head -= shift;
@@ -486,10 +466,10 @@ more:
 
         head += size;
 
-        if (offset + head >= self->header.data_offset + self->header.data_size)
+        if (offset + head >= data_offset + data_size)
                 goto done;
 
-        if (offset + head < self->size)
+        if (offset + head < file_size)
                 goto more;
 done:
         err = 0;
@@ -497,6 +477,38 @@ out_err:
         return err;
 }
 
+int perf_session__process_events(struct perf_session *self,
+                                 struct perf_event_ops *ops)
+{
+        int err;
+
+        if (perf_session__register_idle_thread(self) == NULL)
+                return -ENOMEM;
+
+        if (!symbol_conf.full_paths) {
+                char bf[PATH_MAX];
+
+                if (getcwd(bf, sizeof(bf)) == NULL) {
+                        err = -errno;
+out_getcwd_err:
+                        pr_err("failed to get the current directory\n");
+                        goto out_err;
+                }
+                self->cwd = strdup(bf);
+                if (self->cwd == NULL) {
+                        err = -ENOMEM;
+                        goto out_getcwd_err;
+                }
+                self->cwdlen = strlen(self->cwd);
+        }
+
+        err = __perf_session__process_events(self, self->header.data_offset,
+                                             self->header.data_size,
+                                             self->size, ops);
+out_err:
+        return err;
+}
+
 bool perf_session__has_traces(struct perf_session *self, const char *msg)
 {
         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 752d75aebad..31950fcd8a4 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -50,6 +50,9 @@ void perf_session__delete(struct perf_session *self);
 
 void perf_event_header__bswap(struct perf_event_header *self);
 
+int __perf_session__process_events(struct perf_session *self,
+                                   u64 data_offset, u64 data_size, u64 size,
+                                   struct perf_event_ops *ops);
 int perf_session__process_events(struct perf_session *self,
                                  struct perf_event_ops *event_ops);
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e752837363e..bfb05545967 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1076,25 +1076,28 @@ static bool dso__build_id_equal(const struct dso *self, u8 *build_id)
         return memcmp(self->build_id, build_id, sizeof(self->build_id)) == 0;
 }
 
-static bool __dsos__read_build_ids(struct list_head *head)
+static bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
 {
         bool have_build_id = false;
         struct dso *pos;
 
-        list_for_each_entry(pos, head, node)
+        list_for_each_entry(pos, head, node) {
+                if (with_hits && !pos->hit)
+                        continue;
                 if (filename__read_build_id(pos->long_name, pos->build_id,
                                             sizeof(pos->build_id)) > 0) {
                         have_build_id     = true;
                         pos->has_build_id = true;
                 }
+        }
 
         return have_build_id;
 }
 
-bool dsos__read_build_ids(void)
+bool dsos__read_build_ids(bool with_hits)
 {
-        bool kbuildids = __dsos__read_build_ids(&dsos__kernel),
-             ubuildids = __dsos__read_build_ids(&dsos__user);
+        bool kbuildids = __dsos__read_build_ids(&dsos__kernel, with_hits),
+             ubuildids = __dsos__read_build_ids(&dsos__user, with_hits);
         return kbuildids || ubuildids;
 }
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index e90568a9e46..1b4192ee530 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -157,7 +157,7 @@ struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
 
 int filename__read_build_id(const char *filename, void *bf, size_t size);
 int sysfs__read_build_id(const char *filename, void *bf, size_t size);
-bool dsos__read_build_ids(void);
+bool dsos__read_build_ids(bool with_hits);
 int build_id__sprintf(const u8 *self, int len, char *bf);
 int kallsyms__parse(const char *filename, void *arg,
                     int (*process_symbol)(void *arg, const char *name,