perf_counter: Synthesize VDSO mmap event

perf record synthesizes mmap events for the running process.
Right now it just catches file mappings, but we can check for
the vdso symbol and add that too.

Signed-off-by: Anton Blanchard <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <20090716104817.517264409@samba.org>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4ef78a5e6f326bf7aa08cc10715403b86574a5fe..072aaf0369f88cff9ef931b22f8fbcd5aa653b2f 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -313,6 +313,10 @@ static void pid_synthesize_mmap_samples(pid_t pid)
                if (*pbf == 'x') { /* vm_exec */
                        char *execname = strchr(bf, '/');
 
+                       /* Catch VDSO */
+                       if (execname == NULL)
+                               execname = strstr(bf, "[vdso]");
+
                        if (execname == NULL)
                                continue;