perf probe: Use the last field name as the argument name
Set the last field name to the argument name when the argument
is refering a data-structure member.
e.g.
./perf probe --add 'vfs_read file->f_mode'
Add new event:
probe:vfs_read (on vfs_read with f_mode=file->f_mode)
This probe records file->f_mode, but the argument name becomes "f_mode".
This enables perf-trace command to parse trace event format correctly.
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100412171700.3790.72961.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index ab6f53d..19de8b7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -481,6 +481,10 @@
} while (tmp);
(*fieldp)->name = xstrdup(str);
pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
+
+ /* If no name is specified, set the last field name */
+ if (!arg->name)
+ arg->name = xstrdup((*fieldp)->name);
}
/* Parse perf-probe event command */