perf session: Free the ref_reloc_sym memory at the right place

Which is at perf_session__destroy_kernel_maps, counterpart to the
perf_session__create_kernel_maps where the kmap structure is located, just
after the vmlinux_maps.

Make it also check if the kernel maps were actually created, which may not
be the case if, for instance, perf_session__new can't complete due to
permission problems in, for instance, a 'perf report' case, when a
segfault will take place, that is how this was noticed.

The problem was introduced in d65a458, thus post .35.

This also adds code to release guest machines as them are also created
in perf_session__create_kernel_maps, so should be deleted on this newly
introduced counterpart, perf_session__destroy_kernel_maps.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 04a3b3db9e9..5d2fd52fe7b 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -79,6 +79,12 @@ int perf_session__create_kernel_maps(struct perf_session *self)
 	return ret;
 }
 
+static void perf_session__destroy_kernel_maps(struct perf_session *self)
+{
+	machine__destroy_kernel_maps(&self->host_machine);
+	machines__destroy_guest_kernel_maps(&self->machines);
+}
+
 struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
 {
 	size_t len = filename ? strlen(filename) + 1 : 0;
@@ -150,6 +156,7 @@ static void perf_session__delete_threads(struct perf_session *self)
 void perf_session__delete(struct perf_session *self)
 {
 	perf_header__exit(&self->header);
+	perf_session__destroy_kernel_maps(self);
 	perf_session__delete_dead_threads(self);
 	perf_session__delete_threads(self);
 	machine__exit(&self->host_machine);