perf hist: Only allocate callchain_node if processing callchains

The struct callchain_node size is 120 bytes, that are never used when
there are no callchains or '-g none' is specified, so conditionally
allocate it, reducing sizeof(struct hist_entry) from 210 bytes to only
96, greatly speeding the non-callchain processing.

LKML-Reference: <new-submission>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 381918515a5c..1fb13e5fd1f9 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -110,8 +110,8 @@ static int perf_session__add_hist_entry(struct perf_session *self,
 
         if (symbol_conf.use_callchain) {
                 if (!hit)
-                        callchain_init(&he->callchain);
-                err = append_chain(&he->callchain, data->callchain, syms);
+                        callchain_init(he->callchain);
+                err = append_chain(he->callchain, data->callchain, syms);
                 free(syms);
 
                 if (err)