linux-kernel - [PATCH 03/14] perf trace: Move vfs_getname storage to per thread area

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Date:	Mon, 17 Aug 2015 16:11:56 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 03/14] perf trace: Move vfs_getname storage to per thread area

From: Arnaldo Carvalho de Melo <acme@...hat.com>

We were storing the vfs_getname payload (i.e. ptr->string) into
the trace wide storage area (struct trace), so that we could use the
last payload when setting up the fd->pathname per thread tables, oops,
not a good idea for multi cpu tracing sessions...

Fix it by moving it to the per thread area (struct thread_trace).

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-3j05ttqyaem7kh7oubvr1keo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 38 +++++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 489cc118a36a..2f1162daa3c5 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1315,7 +1315,10 @@ struct thread_trace {
 	double		  runtime_ms;
         struct {
 		unsigned long ptr;
-		int           entry_str_pos;
+		short int     entry_str_pos;
+		bool	      pending_open;
+		unsigned int  namelen;
+		char	      *name;
 	} filename;
 	struct {
 		int	  max;
@@ -1391,7 +1394,6 @@ struct trace {
 		size_t		nr;
 		int		*entries;
 	}			ev_qualifier_ids;
-	const char 		*last_vfs_getname;
 	struct intlist		*tid_list;
 	struct intlist		*pid_list;
 	struct {
@@ -1966,8 +1968,11 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
 			trace__fprintf_entry_head(trace, thread, 1, sample->time, trace->output);
 			fprintf(trace->output, "%-70s\n", ttrace->entry_str);
 		}
-	} else
+	} else {
 		ttrace->entry_pending = true;
+		/* See trace__vfs_getname & trace__sys_exit */
+		ttrace->filename.pending_open = false;
+	}
 
 	if (trace->current != thread) {
 		thread__put(trace->current);
@@ -2003,9 +2008,9 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 
 	ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
 
-	if (id == trace->audit.open_id && ret >= 0 && trace->last_vfs_getname) {
-		trace__set_fd_pathname(thread, ret, trace->last_vfs_getname);
-		trace->last_vfs_getname = NULL;
+	if (id == trace->audit.open_id && ret >= 0 && ttrace->filename.pending_open) {
+		trace__set_fd_pathname(thread, ret, ttrace->filename.name);
+		ttrace->filename.pending_open = false;
 		++trace->stats.vfs_getname;
 	}
 
@@ -2065,9 +2070,7 @@ static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
 	size_t filename_len, entry_str_len, to_move;
 	ssize_t remaining_space;
 	char *pos;
-	const char *filename;
-
-	trace->last_vfs_getname = perf_evsel__rawptr(evsel, sample, "pathname");
+	const char *filename = perf_evsel__rawptr(evsel, sample, "pathname");
 
 	if (!thread)
 		goto out;
@@ -2076,6 +2079,21 @@ static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
 	if (!ttrace)
 		goto out;
 
+	filename_len = strlen(filename);
+
+	if (ttrace->filename.namelen < filename_len) {
+		char *f = realloc(ttrace->filename.name, filename_len + 1);
+
+		if (f == NULL)
+				goto out;
+
+		ttrace->filename.namelen = filename_len;
+		ttrace->filename.name = f;
+	}
+
+	strcpy(ttrace->filename.name, filename);
+	ttrace->filename.pending_open = true;
+
 	if (!ttrace->filename.ptr)
 		goto out;
 
@@ -2084,8 +2102,6 @@ static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
 	if (remaining_space <= 0)
 		goto out;
 
-	filename = trace->last_vfs_getname;
-	filename_len = strlen(filename);
 	if (filename_len > (size_t)remaining_space) {
 		filename += filename_len - remaining_space;
 		filename_len = remaining_space;
-- 
2.1.0

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