perf trace: Move vfs_getname storage to per thread area

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@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-3j05ttqyaem7kh7oubvr1keo@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 489cc11..2f1162d 100644 (file)
--- 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;