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>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 949167e..706f001 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_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_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 @@
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 @@
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 @@
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 ed3efd7..d5facd5 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -205,8 +205,11 @@
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 @@
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 aa8a031..74cbc64 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -385,8 +385,9 @@
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 @@
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 @@
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 @@
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 752d75a..31950fc 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -50,6 +50,9 @@
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 e752837..bfb0554 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1076,25 +1076,28 @@
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 e90568a..1b4192e 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -157,7 +157,7 @@
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,