Em Thu, May 30, 2019 at 02:29:22PM +0100, ufo19890607 escreveu: > 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.
Ok, changing this to: Collect callchains only from kernel space. I.e. this option sets perf_event_attr.exclude_callchain_user to 1, perf_event_attr.exclude_callchain_kernel to 0. > + > +--user-callchains:: > +Collect callchains from user space. And this one to: Collect callchains only from user space. I.e. this option sets perf_event_attr.exclude_callchain_kernel to 1, perf_event_attr.exclude_callchain_user to 0. So that the user don't try using: pref record --user-callchains --kernel-callchains expecting to get both user and kernel callchains and instead gets nothing. Ok? - Arnaldo > + > --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 -- - Arnaldo