perf session: Reduce the number of parms to perf_session__process_events

By having the cwd/cwdlen in the perf_session struct and
full_paths in perf_event_ops.

Now its just a matter of passing the ops.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260741029-4430-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-annotate.c

@@ -469,8 +469,7 @@ static int __cmd_annotate(void)
 	if (session == NULL)
 		return -ENOMEM;
 
-	ret = perf_session__process_events(session, &event_ops, 0,
-					   &event__cwdlen, &event__cwd);
+	ret = perf_session__process_events(session, &event_ops);
 	if (ret)
 		goto out_delete;
 

tools/perf/builtin-kmem.c

@@ -372,8 +372,7 @@ static int read_events(void)
 	if (session == NULL)
 		return -ENOMEM;
 
-	err = perf_session__process_events(session, &event_ops, 0,
-					   &event__cwdlen, &event__cwd);
+	err = perf_session__process_events(session, &event_ops);
 	perf_session__delete(session);
 	return err;
 }

tools/perf/builtin-report.c

@@ -39,7 +39,6 @@ static struct strlist	*dso_list, *comm_list, *sym_list;
 
 static int		force;
 
-static int		full_paths;
 static int		show_nr_samples;
 
 static int		show_threads;
@@ -771,8 +770,7 @@ static int __cmd_report(void)
 	if (show_threads)
 		perf_read_values_init(&show_threads_values);
 
-	ret = perf_session__process_events(session, &event_ops, full_paths,
-					   &event__cwdlen, &event__cwd);
+	ret = perf_session__process_events(session, &event_ops);
 	if (ret)
 		goto out_delete;
 
@@ -877,7 +875,7 @@ static const struct option options[] = {
 		   "pretty printing style key: normal raw"),
 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 		   "sort by key(s): pid, comm, dso, symbol, parent"),
-	OPT_BOOLEAN('P', "full-paths", &full_paths,
+	OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
 		    "Don't shorten the pathnames taking into account the cwd"),
 	OPT_STRING('p', "parent", &parent_pattern, "regex",
 		   "regex filter to identify parent, see: '--sort parent'"),

tools/perf/builtin-sched.c

@@ -1670,8 +1670,7 @@ static int read_events(void)
 	if (session == NULL)
 		return -ENOMEM;
 
-	err = perf_session__process_events(session, &event_ops, 0,
-					   &event__cwdlen, &event__cwd);
+	err = perf_session__process_events(session, &event_ops);
 	perf_session__delete(session);
 	return err;
 }

tools/perf/builtin-timechart.c

@@ -1062,8 +1062,7 @@ static int __cmd_timechart(void)
 	if (session == NULL)
 		return -ENOMEM;
 
-	ret = perf_session__process_events(session, &event_ops, 0,
-					   &event__cwdlen, &event__cwd);
+	ret = perf_session__process_events(session, &event_ops);
 	if (ret)
 		goto out_delete;
 

tools/perf/builtin-trace.c

@@ -125,8 +125,7 @@ static struct perf_event_ops event_ops = {
 
 static int __cmd_trace(struct perf_session *session)
 {
-	return perf_session__process_events(session, &event_ops, 0,
-					    &event__cwdlen, &event__cwd);
+	return perf_session__process_events(session, &event_ops);
 }
 
 struct script_spec {

tools/perf/util/data_map.c

@@ -4,9 +4,6 @@
 #include "thread.h"
 #include "session.h"
 
-static unsigned long	mmap_window = 32;
-static char		__cwd[PATH_MAX];
-
 static int process_event_stub(event_t *event __used,
 			      struct perf_session *session __used)
 {
@@ -141,8 +138,7 @@ static struct thread *perf_session__register_idle_thread(struct perf_session *se
 }
 
 int perf_session__process_events(struct perf_session *self,
-				 struct perf_event_ops *ops,
-				 int full_paths, int *cwdlen, char **cwd)
+				 struct perf_event_ops *ops)
 {
 	int err;
 	unsigned long head, shift;
@@ -168,17 +164,21 @@ int perf_session__process_events(struct perf_session *self,
 	    ops->sample_type_check(sample_type) < 0)
 		goto out_err;
 
-	if (!full_paths) {
-		if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
-			pr_err("failed to get the current directory\n");
+	if (!ops->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;
 		}
-		*cwd = __cwd;
-		*cwdlen = strlen(*cwd);
-	} else {
-		*cwd = NULL;
-		*cwdlen = 0;
+		self->cwd = strdup(bf);
+		if (self->cwd == NULL) {
+			err = -ENOMEM;
+			goto out_getcwd_err;
+		}
+		self->cwdlen = strlen(self->cwd);
 	}
 
 	shift = page_size * (head / page_size);
@@ -186,7 +186,7 @@ int perf_session__process_events(struct perf_session *self,
 	head -= shift;
 
 remap:
-	buf = mmap(NULL, page_size * mmap_window, PROT_READ,
+	buf = mmap(NULL, page_size * self->mmap_window, PROT_READ,
 		   MAP_SHARED, self->fd, offset);
 	if (buf == MAP_FAILED) {
 		pr_err("failed to mmap file\n");
@@ -201,12 +201,12 @@ int perf_session__process_events(struct perf_session *self,
 	if (!size)
 		size = 8;
 
-	if (head + event->header.size >= page_size * mmap_window) {
+	if (head + event->header.size >= page_size * self->mmap_window) {
 		int munmap_ret;
 
 		shift = page_size * (head / page_size);
 
-		munmap_ret = munmap(buf, page_size * mmap_window);
+		munmap_ret = munmap(buf, page_size * self->mmap_window);
 		assert(munmap_ret == 0);
 
 		offset += shift;

tools/perf/util/event.c

 #include <linux/types.h>
 #include "event.h"
 #include "debug.h"
+#include "session.h"
 #include "string.h"
 #include "thread.h"
 
@@ -186,9 +187,6 @@ void event__synthesize_threads(int (*process)(event_t *event,
 	closedir(proc);
 }
 
-char *event__cwd;
-int  event__cwdlen;
-
 struct events_stats event__stats;
 
 int event__process_comm(event_t *self, struct perf_session *session __used)
@@ -212,11 +210,11 @@ int event__process_lost(event_t *self, struct perf_session *session __used)
 	return 0;
 }
 
-int event__process_mmap(event_t *self, struct perf_session *session __used)
+int event__process_mmap(event_t *self, struct perf_session *session)
 {
 	struct thread *thread = threads__findnew(self->mmap.pid);
 	struct map *map = map__new(&self->mmap, MAP__FUNCTION,
-				   event__cwd, event__cwdlen);
+				   session->cwd, session->cwdlen);
 
 	dump_printf(" %d/%d: [%p(%p) @ %p]: %s\n",
 		    self->mmap.pid, self->mmap.tid,

tools/perf/util/session.c

@@ -61,6 +61,9 @@ struct perf_session *perf_session__new(const char *filename, int mode,
 		goto out_delete;
 
 	memcpy(self->filename, filename, len);
+	self->mmap_window = 32;
+	self->cwd = NULL;
+	self->cwdlen = 0;
 
 	if (mode == O_RDONLY && perf_session__open(self, force) < 0) {
 		perf_session__delete(self);
@@ -77,5 +80,6 @@ void perf_session__delete(struct perf_session *self)
 {
 	perf_header__exit(&self->header);
 	close(self->fd);
+	free(self->cwd);
 	free(self);
 }

tools/perf/util/session.h

@@ -7,7 +7,10 @@
 struct perf_session {
 	struct perf_header	header;
 	unsigned long		size;
+	unsigned long		mmap_window;
 	int			fd;
+	int			cwdlen;
+	char			*cwd;
 	char filename[0];
 };
 
@@ -25,6 +28,7 @@ struct perf_event_ops {
 	event_op	process_unthrottle_event;
 	int		(*sample_type_check)(u64 sample_type);
 	unsigned long	total_unknown;
+	bool		full_paths;
 };
 
 struct perf_session *perf_session__new(const char *filename, int mode,
@@ -32,8 +36,7 @@ struct perf_session *perf_session__new(const char *filename, int mode,
 void perf_session__delete(struct perf_session *self);
 
 int perf_session__process_events(struct perf_session *self,
-				 struct perf_event_ops *event_ops,
-				 int full_paths, int *cwdlen, char **cwd);
+				 struct perf_event_ops *event_ops);
 
 int perf_header__read_build_ids(int input, u64 offset, u64 file_size);