Commit 6122e4e4 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by Ingo Molnar
Browse files

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: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarArnaldo 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: default avatarIngo Molnar <mingo@elte.hu>
parent 7b2567c1

tools/perf/builtin-record.c

+18 −19
Original line number Diff line number Diff line
@@ -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) {

tools/perf/util/header.c

+5 −2
Original line number Diff line number Diff line
@@ -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);

tools/perf/util/session.c

+38 −26
Original line number Diff line number Diff line
@@ -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)) {

tools/perf/util/session.h

+3 −0
Original line number Diff line number Diff line
@@ -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);

tools/perf/util/symbol.c

+8 −5
Original line number Diff line number Diff line
@@ -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;

}

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