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Subject[PATCH 19/21] perf top: Add --children option
The --children option is for showing accumulated overhead (period)
value as well as self overhead. It should be used with one of -g or
--call-graph option.

Tested-by: Arun Sharma <>
Acked-by: Jiri Olsa <>
Cc: Frederic Weisbecker <>
Signed-off-by: Namhyung Kim <>
tools/perf/Documentation/perf-top.txt | 8 +++++++-
tools/perf/builtin-top.c | 7 +++++++
2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index 50fcf97a7dc9..fd2db1a83de2 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -119,7 +119,7 @@ Default is to monitor all CPUS.
Specify output field - multiple keys can be specified in CSV format.
Following fields are available:
- overhead, overhead_sys, overhead_us, sample and period.
+ overhead, overhead_sys, overhead_us, overhead_children, sample and period.
Also it can contain any sort key(s).

By default, every sort keys not specified in --field will be appended
@@ -161,6 +161,12 @@ Default is to monitor all CPUS.
Setup and enable call-graph (stack chain/backtrace) recording,
implies -g.

+ Accumulate callchain of children to parent entry so that then can
+ show up in the output. The output will have a new "Children" column
+ and will be sorted on the data. It requires -g/--call-graph option
+ enabled.
Set the stack depth limit when parsing the callchain, anything
beyond the specified depth will be ignored. This is a trade-off
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b08939c7f15b..2a8dc3e0a913 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1103,6 +1103,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_CALLBACK(0, "call-graph", &top.record_opts,
"mode[,dump_size]", record_callchain_help,
+ OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
+ "Accumulate callchains of children and show total overhead as well"),
OPT_INTEGER(0, "max-stack", &top.max_stack,
"Set the maximum stack depth when parsing the callchain. "
"Default: " __stringify(PERF_MAX_STACK_DEPTH)),
@@ -1205,6 +1207,11 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)

top.sym_evsel = perf_evlist__first(top.evlist);

+ if (!symbol_conf.use_callchain) {
+ symbol_conf.cumulate_callchain = false;
+ perf_hpp__cancel_cumulate();
+ }
symbol_conf.priv_size = sizeof(struct annotation);

symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);

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