From: Kan Liang <[email protected]>
The accumulated period for dummy entry should also be 0.
Otherwise, the total overhead could be overcounted.
[perf]$ perf record -e '{LLC-load-misses,cpu/instructions/}'
--call-graph=lbr ./tchain
[perf]$ perf report --stdio
# To display the perf.data header info, please use
--header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 21K of event 'anon group { LLC-load-misses, cpu/instructions/
}'
# Event count (approx.): 16313667937
#
# Children Self Command Shared Object
Symbol
# ................ ................ ........... ................
............................
#
4769.98% 0.01% 0.00% 0.01% tchain_edit [kernel.vmlinux]
[k] update_fast_timekeeper
4356.18% 0.01% 0.00% 0.01% tchain_edit [kernel.vmlinux]
[k] trigger_load_balance
3181.12% 0.01% 0.00% 0.01% tchain_edit [kernel.vmlinux]
[k] irq_work_tick
1592.37% 0.00% 0.00% 0.00% tchain_edit [kernel.vmlinux]
[k] cpu_needs_another_gp
Signed-off-by: Kan Liang <[email protected]>
---
tools/perf/util/hist.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 991a351..657d1ca 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -2062,6 +2062,7 @@ static struct hist_entry *hists__add_dummy_entry(struct hists *hists,
if (he) {
memset(&he->stat, 0, sizeof(he->stat));
he->hists = hists;
+ memset(he->stat_acc, 0, sizeof(he->stat));
rb_link_node(&he->rb_node_in, parent, p);
rb_insert_color(&he->rb_node_in, root);
hists__inc_stats(hists, he);
--
2.5.0