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Commit 1de7b8bf authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Arnaldo Carvalho de Melo
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perf probe: Search SDT/cached event from all probe caches 



Search SDT/cached event from all probe caches if user doesn't pass any
binary. With this, we don't have to specify target binary for SDT and
named cached events (which start with %).

E.g. without this, a target binary must be passed with -x.

  # perf probe -x /usr/lib64/libc-2.20.so -a %sdt_libc:\*

With this change, we don't need it anymore.

  # perf probe -a %sdt_libc:\*

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146831792812.17065.2353705982669445313.stgit@devbox


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 42bba263

tools/perf/util/probe-event.c

+86 −19
Original line number Diff line number Diff line
@@ -2557,41 +2557,60 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev, 
	return 0;

}



static int __add_probe_trace_events(struct perf_probe_event *pev,

				     struct probe_trace_event *tevs,

				     int ntevs, bool allow_suffix)

static int __open_probe_file_and_namelist(bool uprobe,

					  struct strlist **namelist)

{

	int i, fd, ret;

	struct probe_trace_event *tev = NULL;

	struct probe_cache *cache = NULL;

	struct strlist *namelist;

	int fd;



	fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));

	fd = probe_file__open(PF_FL_RW | (uprobe ? PF_FL_UPROBE : 0));

	if (fd < 0)

		return fd;



	/* Get current event names */

	namelist = probe_file__get_namelist(fd);

	if (!namelist) {

	*namelist = probe_file__get_namelist(fd);

	if (!(*namelist)) {

		pr_debug("Failed to get current event list.\n");

		ret = -ENOMEM;

		goto close_out;

		close(fd);

		return -ENOMEM;

	}

	return fd;

}



static int __add_probe_trace_events(struct perf_probe_event *pev,

				     struct probe_trace_event *tevs,

				     int ntevs, bool allow_suffix)

{

	int i, fd[2] = {-1, -1}, up, ret;

	struct probe_trace_event *tev = NULL;

	struct probe_cache *cache = NULL;

	struct strlist *namelist[2] = {NULL, NULL};



	up = pev->uprobes ? 1 : 0;

	fd[up] = __open_probe_file_and_namelist(up, &namelist[up]);

	if (fd[up] < 0)

		return fd[up];



	ret = 0;

	for (i = 0; i < ntevs; i++) {

		tev = &tevs[i];

		up = tev->uprobes ? 1 : 0;

		if (fd[up] == -1) {	/* Open the kprobe/uprobe_events */

			fd[up] = __open_probe_file_and_namelist(up,

								&namelist[up]);

			if (fd[up] < 0)

				goto close_out;

		}

		/* Skip if the symbol is out of .text or blacklisted */

		if (!tev->point.symbol && !pev->uprobes)

			continue;



		/* Set new name for tev (and update namelist) */

		ret = probe_trace_event__set_name(tev, pev, namelist,

		ret = probe_trace_event__set_name(tev, pev, namelist[up],

						  allow_suffix);

		if (ret < 0)

			break;



		ret = probe_file__add_event(fd, tev);

		ret = probe_file__add_event(fd[up], tev);

		if (ret < 0)

			break;
@@ -2614,9 +2633,12 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, 
		probe_cache__delete(cache);

	}



	strlist__delete(namelist);

close_out:

	close(fd);

	for (up = 0; up < 2; up++) {

		strlist__delete(namelist[up]);

		if (fd[up] >= 0)

			close(fd[up]);

	}

	return ret;

}
@@ -2989,6 +3011,48 @@ static int find_cached_events(struct perf_probe_event *pev, 
	return ret;

}



/* Try to find probe_trace_event from all probe caches */

static int find_cached_events_all(struct perf_probe_event *pev,

				   struct probe_trace_event **tevs)

{

	struct probe_trace_event *tmp_tevs = NULL;

	struct strlist *bidlist;

	struct str_node *nd;

	char *pathname;

	int ntevs = 0;

	int ret;



	/* Get the buildid list of all valid caches */

	bidlist = build_id_cache__list_all(true);

	if (!bidlist) {

		ret = -errno;

		pr_debug("Failed to get buildids: %d\n", ret);

		return ret;

	}



	ret = 0;

	strlist__for_each_entry(nd, bidlist) {

		pathname = build_id_cache__origname(nd->s);

		ret = find_cached_events(pev, &tmp_tevs, pathname);

		/* In the case of cnt == 0, we just skip it */

		if (ret > 0)

			ret = concat_probe_trace_events(tevs, &ntevs,

							&tmp_tevs, ret);

		free(pathname);

		if (ret < 0)

			break;

	}

	strlist__delete(bidlist);



	if (ret < 0) {

		clear_probe_trace_events(*tevs, ntevs);

		zfree(tevs);

	} else

		ret = ntevs;



	return ret;

}



static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,

					      struct probe_trace_event **tevs)

{
@@ -2998,10 +3062,13 @@ static int find_probe_trace_events_from_cache(struct perf_probe_event *pev, 
	struct str_node *node;

	int ret, i;



	if (pev->sdt)

	if (pev->sdt) {

		/* For SDT/cached events, we use special search functions */

		if (!pev->target)

			return find_cached_events_all(pev, tevs);

		else

			return find_cached_events(pev, tevs, pev->target);



	}

	cache = probe_cache__new(pev->target);

	if (!cache)

		return 0;