From nobody Tue Apr 7 02:34:19 2026 Received: from mail-dl1-f74.google.com (mail-dl1-f74.google.com [74.125.82.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3EA2C2C029D for ; Tue, 17 Mar 2026 03:06:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773716786; cv=none; b=ha7TQZ6W220ZjoYUn1CztEb/S0NzdySKhgX0m6I1+ipeiK4rrKbwQvukA40/RdhdHGvex15TBPw965omU6/kG8g90iMi1VLTSjhUBgB1qY9/4cF52ttJ4WxuPD14qJZcvy1SPRaIWkg0E1KsxgMlqWb6UZotJSBR/kzChpmjEbY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773716786; c=relaxed/simple; bh=0T5+Gr3wi71gLdCCrZTsYWqFzob7IGKsffItAl2oKd8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=oPzCGalcKiuaz+R1c8vP1Q6X02g+7ZLbfr/zDlvOwu4rDc/xcJ7Fmt95Fs9jVbTb5bvejUSO9yxe0L7AlumQ7UR0TX7XHj6OEPDOSVJct5lPsTpmViTVcM6THEQTh5FRyj4YqNv8sNlEYI+DvXuPDswwkeo3TcxPVX5S+azh2ec= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=PuULf5cb; arc=none smtp.client-ip=74.125.82.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="PuULf5cb" Received: by mail-dl1-f74.google.com with SMTP id a92af1059eb24-128edc72e5bso23758338c88.1 for ; Mon, 16 Mar 2026 20:06:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773716783; x=1774321583; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=/bQJ/BLiJ4Z3TZocKrA/GIS6qvvcfJbGWDZdIMkxhtU=; b=PuULf5cbvUXsvIbxGFZ/vxsZT1TCEFPc0pU4NSAHKi8Rs7vrKi/lrZkf7px63rEULu 3PmsqPw6EbEauN0K+NIuM+jBAfZ4zpCQeULIqG75F3rs77FuUbKm6TA9XwxCKninNyw2 EbJ35tCn6TtSJhN3AyHUp0Fs27sbPw/FpHBELSGtTJYc/1AbECT5Mk6Vi/8rhYrGNcIr 2NRxrxiL499poePKopO87bYyEm+XfLRgr+RY71ahNpQZ4qq+29G67NeuZkg8IZLBh7vd T0k6fn9XCsB4IwXLlkHH4jlW/IEWqGIuBy+XsOMICpZMS/DJxgj5suCrf447FaWSqckq txAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773716783; x=1774321583; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=/bQJ/BLiJ4Z3TZocKrA/GIS6qvvcfJbGWDZdIMkxhtU=; b=qkjhdV3fFWHEVEQtqa1vsjcVh0T1vXzoHksp7or7awjg/UgyCZJHNy+TMKFuWF/fUf qTwKb4TuvSAgbh85bvtibpf4WSYFbWnBevYMdVOaqe+9YdP1kXNH/O5VDQ93Bpi82IlI ec5Nsl2m4yyldQfn7JlvZfZXKKg+aJYQH9JopPxJ7BzSH+pD9GaRlMuLi3pcR58ymvt4 4mTMYOnHPJ1DkhGdOrDHofHUOVVC680z8UG3K3kGNDf2dRDXhYmNIkQ2OkqsgUKXKI0h wqwZ9McGurPTYGGtYm7irW2QZIodt0uywWGHLcwZPW1OaMYJj6MdLpl9V0Bg0UhI5KCX r8yg== X-Forwarded-Encrypted: i=1; AJvYcCXaHbOz+NmHboXWGp2P6R1QvwahCOtzfE0mkie4rS2NPX3q1VVZYM5pWT/h3nEOC89bnF76x4fce1TcuMw=@vger.kernel.org X-Gm-Message-State: AOJu0YyCRJGKYndYFapOvBXqOsSQjmxptPOMo93xnmQv6pq7fQDoAGKJ nKh5Rs5rMSHNXTcvcMWJwc+tVriiRZY/J/EtKsK4T10hbty2ilANdFlQC4Z7rLVU8tRa6KBUjze Zpu98jasJhA== X-Received: from dlboy10.prod.google.com ([2002:a05:7022:128a:b0:128:f497:319c]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:422:b0:127:3440:e5d5 with SMTP id a92af1059eb24-128f3dc591cmr7312597c88.21.1773716783156; Mon, 16 Mar 2026 20:06:23 -0700 (PDT) Date: Mon, 16 Mar 2026 20:06:01 -0700 In-Reply-To: <20260317030601.567422-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260317030601.567422-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260317030601.567422-6-irogers@google.com> Subject: [PATCH v4 5/5] perf evlist: Improve default event for s390 From: Ian Rogers To: tmricht@linux.ibm.com Cc: irogers@google.com, acme@kernel.org, agordeev@linux.ibm.com, gor@linux.ibm.com, hca@linux.ibm.com, japo@linux.ibm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-s390@vger.kernel.org, namhyung@kernel.org, sumanthk@linux.ibm.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Frame pointer callchains are not supported on s390 and dwarf callchains are only supported on software events. Switch the default event from cycles to cpu-clock or task-clock on s390 if callchains are enabled. If frame pointer callchains are requested on s390, warn and switch to dwarf callchains. Signed-off-by: Ian Rogers --- tools/perf/builtin-record.c | 5 +++-- tools/perf/builtin-top.c | 2 +- tools/perf/tests/event_update.c | 4 +++- tools/perf/tests/expand-cgroup.c | 4 +++- tools/perf/tests/perf-record.c | 7 +++++-- tools/perf/tests/topology.c | 4 +++- tools/perf/util/callchain.c | 16 ++++++++-------- tools/perf/util/evlist.c | 32 +++++++++++++++++++++----------- tools/perf/util/evlist.h | 2 +- tools/perf/util/evsel.c | 5 +++++ 10 files changed, 53 insertions(+), 28 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index e65cd7bf1477..604c00c58152 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -3466,7 +3466,7 @@ static struct option __record_options[] =3D { OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", "Minimal number of bytes that is extracted from mmap data pages (de= fault: 1)", record__mmap_flush_parse), - OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, + OPT_CALLBACK_NOOPT('g', NULL, &record.opts, NULL, "enables call-graph recording" , &record_callchain_opt), OPT_CALLBACK(0, "call-graph", &record.opts, @@ -4250,7 +4250,8 @@ int cmd_record(int argc, const char **argv) record.opts.tail_synthesize =3D true; =20 if (rec->evlist->core.nr_entries =3D=3D 0) { - struct evlist *def_evlist =3D evlist__new_default(); + struct evlist *def_evlist =3D evlist__new_default(&rec->opts.target, + callchain_param.enabled); =20 if (!def_evlist) goto out; diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 710604c4f6f6..58bab595b024 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1695,7 +1695,7 @@ int cmd_top(int argc, const char **argv) goto out_delete_evlist; =20 if (!top.evlist->core.nr_entries) { - struct evlist *def_evlist =3D evlist__new_default(); + struct evlist *def_evlist =3D evlist__new_default(target, callchain_para= m.enabled); =20 if (!def_evlist) goto out_delete_evlist; diff --git a/tools/perf/tests/event_update.c b/tools/perf/tests/event_updat= e.c index cb9e6de2e033..facc65e29f20 100644 --- a/tools/perf/tests/event_update.c +++ b/tools/perf/tests/event_update.c @@ -8,6 +8,7 @@ #include "header.h" #include "machine.h" #include "util/synthetic-events.h" +#include "target.h" #include "tool.h" #include "tests.h" #include "debug.h" @@ -81,7 +82,8 @@ static int test__event_update(struct test_suite *test __m= aybe_unused, int subtes { struct evsel *evsel; struct event_name tmp; - struct evlist *evlist =3D evlist__new_default(); + struct target target =3D {}; + struct evlist *evlist =3D evlist__new_default(&target, /*sample_callchain= s=3D*/false); =20 TEST_ASSERT_VAL("failed to get evlist", evlist); =20 diff --git a/tools/perf/tests/expand-cgroup.c b/tools/perf/tests/expand-cgr= oup.c index c7b32a220ca1..dd547f2f77cc 100644 --- a/tools/perf/tests/expand-cgroup.c +++ b/tools/perf/tests/expand-cgroup.c @@ -8,6 +8,7 @@ #include "parse-events.h" #include "pmu-events/pmu-events.h" #include "pfm.h" +#include "target.h" #include #include #include @@ -99,7 +100,8 @@ out: for (i =3D 0; i < nr_events; i++) static int expand_default_events(void) { int ret; - struct evlist *evlist =3D evlist__new_default(); + struct target target =3D {}; + struct evlist *evlist =3D evlist__new_default(&target, /*sample_callchain= s=3D*/false); =20 TEST_ASSERT_VAL("failed to get evlist", evlist); =20 diff --git a/tools/perf/tests/perf-record.c b/tools/perf/tests/perf-record.c index efbd9cd60c63..c6e31ab8a6b8 100644 --- a/tools/perf/tests/perf-record.c +++ b/tools/perf/tests/perf-record.c @@ -84,8 +84,11 @@ static int test__PERF_RECORD(struct test_suite *test __m= aybe_unused, int subtest CPU_ZERO_S(cpu_mask_size, cpu_mask); =20 perf_sample__init(&sample, /*all=3D*/false); - if (evlist =3D=3D NULL) /* Fallback for kernels lacking PERF_COUNT_SW_DUM= MY */ - evlist =3D evlist__new_default(); + if (evlist =3D=3D NULL) { /* Fallback for kernels lacking PERF_COUNT_SW_D= UMMY */ + struct target target =3D {}; + + evlist =3D evlist__new_default(&target, /*sample_callchains=3D*/false); + } =20 if (evlist =3D=3D NULL) { pr_debug("Not enough memory to create evlist\n"); diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c index ec01150d208d..a34a7ab19a80 100644 --- a/tools/perf/tests/topology.c +++ b/tools/perf/tests/topology.c @@ -9,6 +9,7 @@ #include "evlist.h" #include "debug.h" #include "pmus.h" +#include "target.h" #include =20 #define TEMPL "/tmp/perf-test-XXXXXX" @@ -37,11 +38,12 @@ static int session_write_header(char *path) .path =3D path, .mode =3D PERF_DATA_MODE_WRITE, }; + struct target target =3D {}; =20 session =3D perf_session__new(&data, NULL); TEST_ASSERT_VAL("can't get session", !IS_ERR(session)); =20 - session->evlist =3D evlist__new_default(); + session->evlist =3D evlist__new_default(&target, /*sample_callchains=3D*/= false); TEST_ASSERT_VAL("can't get evlist", session->evlist); session->evlist->session =3D session; =20 diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 1203d9d23fda..bc3c1e955b02 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -30,6 +30,7 @@ #include "machine.h" #include "map.h" #include "callchain.h" +#include "dwarf-regs.h" #include "branch.h" #include "record.h" #include "symbol.h" @@ -378,14 +379,13 @@ int record_callchain_opt(const struct option *opt, const char *arg __maybe_unused, int unset __maybe_unused) { - struct callchain_param *callchain =3D opt->value; - - callchain->enabled =3D true; - - if (callchain->record_mode =3D=3D CALLCHAIN_NONE) - callchain->record_mode =3D CALLCHAIN_FP; - - callchain_debug(callchain); + callchain_param.enabled =3D true; + if (callchain_param.record_mode =3D=3D CALLCHAIN_NONE) { + /* s390 lacks kernel framepoint unwinding. */ + record_opts__parse_callchain(opt->value, &callchain_param, + EM_HOST !=3D EM_S390 ? "fp" : "dwarf", + /*unset=3D*/0); + } return 0; } =20 diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 591bdf0b3e2a..c702741a9173 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -13,6 +13,7 @@ #include "util/mmap.h" #include "thread_map.h" #include "target.h" +#include "dwarf-regs.h" #include "evlist.h" #include "evsel.h" #include "record.h" @@ -98,38 +99,47 @@ struct evlist *evlist__new(void) return evlist; } =20 -struct evlist *evlist__new_default(void) +struct evlist *evlist__new_default(const struct target *target, bool sampl= e_callchains) { struct evlist *evlist =3D evlist__new(); bool can_profile_kernel; struct perf_pmu *pmu =3D NULL; + struct evsel *evsel; + char buf[256]; + int err; =20 if (!evlist) return NULL; =20 can_profile_kernel =3D perf_event_paranoid_check(1); =20 - while ((pmu =3D perf_pmus__scan_core(pmu)) !=3D NULL) { - char buf[256]; - int err; - - snprintf(buf, sizeof(buf), "%s/cycles/%s", pmu->name, + if (EM_HOST =3D=3D EM_S390 && sample_callchains) { + snprintf(buf, sizeof(buf), "software/%s/%s", + target__has_cpu(target) ? "cpu-clock" : "task-clock", can_profile_kernel ? "P" : "Pu"); err =3D parse_event(evlist, buf); - if (err) { - evlist__delete(evlist); - return NULL; + if (err) + goto out_err; + } else { + while ((pmu =3D perf_pmus__scan_core(pmu)) !=3D NULL) { + snprintf(buf, sizeof(buf), "%s/cycles/%s", pmu->name, + can_profile_kernel ? "P" : "Pu"); + err =3D parse_event(evlist, buf); + if (err) + goto out_err; } } =20 + /* If there is only 1 event a sample identifier isn't necessary. */ if (evlist->core.nr_entries > 1) { - struct evsel *evsel; - evlist__for_each_entry(evlist, evsel) evsel__set_sample_id(evsel, /*can_sample_identifier=3D*/false); } =20 return evlist; +out_err: + evlist__delete(evlist); + return NULL; } =20 struct evlist *evlist__new_dummy(void) diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index d17c3b57a409..e507f5f20ef6 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -104,7 +104,7 @@ struct evsel_str_handler { }; =20 struct evlist *evlist__new(void); -struct evlist *evlist__new_default(void); +struct evlist *evlist__new_default(const struct target *target, bool sampl= e_callchains); struct evlist *evlist__new_dummy(void); void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus, struct perf_thread_map *threads); diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 54c8922a8e47..5a294595a677 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1021,6 +1021,11 @@ static void __evsel__config_callchain(struct evsel *= evsel, const struct record_o bool function =3D evsel__is_function_event(evsel); struct perf_event_attr *attr =3D &evsel->core.attr; =20 + if (EM_HOST =3D=3D EM_S390 && param->record_mode =3D=3D CALLCHAIN_FP) { + pr_warning_once( + "Framepointer unwinding lacks kernel support. Use '--call-graph dwarf'\= n"); + } + evsel__set_sample_bit(evsel, CALLCHAIN); =20 attr->sample_max_stack =3D param->max_stack; --=20 2.53.0.851.ga537e3e6e9-goog