[PATCH] perf: Add vm_ops->name call for mmap event name retrieval

From: Jiri Olsa
Date: Mon Jul 14 2014 - 11:57:47 EST

Following patch added another way to get mmap name:
78d683e mm, fs: Add vm_ops->name as an alternative to arch_vma_name

The vdso vma mapping already switch to this and we no longer
get vdso name via arch_vma_name function. Adding this way to
the perf mmap event name retrieval code.

Caught this via perf test:

$ sudo ./perf test -v 7
7: Validate PERF_RECORD_* events & perf_sample fields :
--- start ---


PERF_RECORD_MMAP for [vdso] missing!
test child finished with 255
---- end ----
Validate PERF_RECORD_* events & perf_sample fields: FAILED!

Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
kernel/events/core.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 67e3b9c..4799676 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5266,6 +5266,12 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)

goto got_name;
} else {
+ if (vma->vm_ops && vma->vm_ops->name) {
+ name = (char *) vma->vm_ops->name(vma);
+ if (name)
+ goto cpy_name;
+ }
name = (char *)arch_vma_name(vma);
if (name)
goto cpy_name;

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