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.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arun Sharma <asharma@fb.com>
Tested-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1401335910-16832-21-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

2 files changed, 14 insertions, 1 deletions

diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index dcfa54c851e9..180ae02137a5 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.
 --fields=::
         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.
 
+--children::
+        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.
+
 --max-stack::
         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 b1cb5f589ade..fea55e3fc931 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1098,6 +1098,8 @@ 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,
                      &parse_callchain_opt),
+        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)),
@@ -1203,6 +1205,11 @@ 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);