[PATCH RESEND v3 5/6] perf record: Support AUX pause and resume with BPF
From: Leo Yan <leo.yan@arm.com>
Date: 2025-07-25 10:08:49
Also in:
bpf, linux-perf-users, lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
This commit introduces an option "--bpf-aux-pause" for loading BPF
program to trigger AUX pause and resume.
After:
perf record -e cs_etm/aux-action=start-paused/ \
--bpf-aux-pause="kretprobe:p:__arm64_sys_openat,kprobe:r:__arm64_sys_openat,tp:r:sched:sched_switch" \
-a -- ls
perf record -e cs_etm/aux-action=start-paused/ \
--bpf-aux-pause="kretprobe:p:__arm64_sys_openat,kprobe:r:__arm64_sys_openat,tp:r:sched:sched_switch" \
--per-thread -- ls
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
tools/perf/builtin-record.c | 20 +++++++++++++++++++-
tools/perf/util/evsel.c | 6 ++++++
tools/perf/util/record.h | 1 +
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8059bce85a510b2dddc66f1b8b0013276840eddc..793609c0a59e8abcd248608f55e0af03a253138d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c@@ -880,7 +880,12 @@ static int record__auxtrace_init(struct record *rec) if (err) return err; - return auxtrace_parse_filters(rec->evlist); + err = auxtrace_parse_filters(rec->evlist); + if (err) + return err; + + return auxtrace__prepare_bpf(rec->itr, + rec->opts.auxtrace_bpf_aux_pause_opts); } #else
@@ -2506,6 +2511,10 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) evlist__config(rec->evlist, opts, &callchain_param); + err = auxtrace__set_bpf_filter(rec->evlist, opts); + if (err) + goto out_free_threads; + /* Debug message used by test scripts */ pr_debug3("perf record opening and mmapping events\n"); if (record__open(rec) != 0) {
@@ -2579,6 +2588,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (record__start_threads(rec)) goto out_free_threads; + if (auxtrace__enable_bpf()) + goto out_free_threads; + /* * When perf is starting the traced process, all the events * (apart from group members) have enable_on_exec=1 set,
@@ -2907,6 +2919,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) } out_delete_session: + auxtrace__cleanup_bpf(); #ifdef HAVE_EVENTFD_SUPPORT if (done_fd >= 0) { fd = done_fd;
@@ -3629,6 +3642,11 @@ static struct option __record_options[] = { OPT_CALLBACK(0, "off-cpu-thresh", &record.opts, "ms", "Dump off-cpu samples if off-cpu time exceeds this threshold (in milliseconds). (Default: 500ms)", record__parse_off_cpu_thresh), + OPT_STRING_OPTARG(0, "bpf-aux-pause", &record.opts.auxtrace_bpf_aux_pause_opts, + "{kprobe|kretprobe}:{p|r}:function_name\n" + "\t\t\t {uprobe|uretprobe}:{p|r}:executable:function_name\n" + "\t\t\t {tp|tracepoint}:{p|r}:category:tracepoint\n", + "Enable AUX pause with BPF backend", ""), OPT_END() };
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d55482f094bf95ac7b5c5173c1341baeb0fa9c93..f240e48f41a3e7ca5ba81733efc58a25c5c829ba 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c@@ -2650,6 +2650,12 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, bpf_counter__install_pe(evsel, idx, fd); + /* Update event info into BPF map for AUX trace */ + if (auxtrace__update_bpf_map(evsel, idx, fd)) { + err = -EINVAL; + goto out_close; + } + if (unlikely(test_attr__enabled())) { test_attr__open(&evsel->core.attr, pid, cpu, fd, group_fd, evsel->open_flags);
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index ea3a6c4657eefb743dc3d54b0b791ea39117cc10..1b1c2ed7fcadae8b56408b3b1b154faef3996eb3 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h@@ -65,6 +65,7 @@ struct record_opts { size_t auxtrace_snapshot_size; const char *auxtrace_snapshot_opts; const char *auxtrace_sample_opts; + const char *auxtrace_bpf_aux_pause_opts; bool sample_transaction; bool use_clockid; clockid_t clockid;
--
2.34.1