From: yuzhoujian <yuzhouj...@didichuxing.com>
One can just record callchains in the kernel or user space with
this new options. We can use it together with "--all-kernel" options.
This two options is used just like print_stack(sys) or print_ustack(usr)
for systemtap.
Show below is the usage of this new option combined with "--all-kernel"
options.
1. Configure all used events to run in kernel space and just
collect kernel callchains.
$ perf record -a -g --all-kernel --kernel-callchains
2. Configure all used events to run in kernel space and just
collect user callchains.
$ perf record -a -g --all-kernel --user-callchains
Signed-off-by: yuzhoujian <yuzhouj...@didichuxing.com>
---
tools/perf/Documentation/perf-record.txt | 6 ++++++
tools/perf/builtin-record.c | 4 ++++
tools/perf/perf.h | 2 ++
tools/perf/util/evsel.c | 4 ++++
4 files changed, 16 insertions(+)
diff --git a/tools/perf/Documentation/perf-record.txt
b/tools/perf/Documentation/perf-record.txt
index de269430720a..b647eb3db0c6 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -490,6 +490,12 @@ Configure all used events to run in kernel space.
--all-user::
Configure all used events to run in user space.
+--kernel-callchains::
+Collect callchains from kernel space.
+
+--user-callchains::
+Collect callchains from user space.
+
--timestamp-filename
Append timestamp to output file name.
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e2c3a585a61e..dca55997934e 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -2191,6 +2191,10 @@ static struct option __record_options[] = {
OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
"Configure all used events to run in user space.",
PARSE_OPT_EXCLUSIVE),
+ OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
+ "collect kernel callchains"),
+ OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
+ "collect user callchains"),
OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
"clang binary to use for compiling BPF scriptlets"),
OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index d59dee61b64d..711e009381ec 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -61,6 +61,8 @@ struct record_opts {
bool record_switch_events;
bool all_kernel;
bool all_user;
+ bool kernel_callchains;
+ bool user_callchains;
bool tail_synthesize;
bool overwrite;
bool ignore_missing_thread;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index a6f572a40deb..a606b2833e27 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -680,6 +680,10 @@ static void __perf_evsel__config_callchain(struct
perf_evsel *evsel,
attr->sample_max_stack = param->max_stack;
+ if (opts->kernel_callchains)
+ attr->exclude_callchain_user = 1;
+ if (opts->user_callchains)
+ attr->exclude_callchain_kernel = 1;
if (param->record_mode == CALLCHAIN_LBR) {
if (!opts->branch_stack) {
if (attr->exclude_user) {
--
2.14.1
