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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V8iwSSFY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V8iwSSFY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F4F1C116B1; Thu, 20 Nov 2025 23:48:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763682494; bh=upTAgARAQAq18z+WH9kjn/9KKukOA/BvWpQEDF9vHOM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V8iwSSFY8uj+09NJSUmTbGyYmh+2LI4TP5WNJ7wLMH1ErEVt3MhCc0WJIazEmRT7k jeH8xoBTWzaMg16GgcZcvh+AH9LS/OgpsMXGcvUcKQ9GXgcXV3v03+sR0cG26xepsM 4ucfs1jl/6jZ+R14b0cVTVJtLrlCOo5+cZVY3eBqUyIx7kRrHrRbyXzTdglVZWE1UG CyfYH1I6sTyaiQwapuPiIX3iQx4ImbJqsed+SqJCbFeb8vx1Su274bOp/0Zap8u7Qv u7NoTViEvkstNXam+LVYy3LNWbze5sWM4WgQPSRP4Zz+UFmQhYfu9p+RB+ttZO5s4r f2D+5dSb2bhWA== From: Namhyung Kim To: Arnaldo Carvalho de Melo , Ian Rogers , James Clark Cc: Jiri Olsa , Adrian Hunter , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Jens Remus , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v6 4/6] perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED Date: Thu, 20 Nov 2025 15:48:02 -0800 Message-ID: <20251120234804.156340-5-namhyung@kernel.org> X-Mailer: git-send-email 2.52.0.rc2.455.g230fcf2819-goog In-Reply-To: <20251120234804.156340-1-namhyung@kernel.org> References: <20251120234804.156340-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Handle the deferred callchains in the script output. $ perf script ... pwd 2312 121.163435: 249113 cpu/cycles/P: ffffffff845b78d8 __build_id_parse.isra.0+0x218 ([kernel.kallsyms]) ffffffff83bb5bf6 perf_event_mmap+0x2e6 ([kernel.kallsyms]) ffffffff83c31959 mprotect_fixup+0x1e9 ([kernel.kallsyms]) ffffffff83c31dc5 do_mprotect_pkey+0x2b5 ([kernel.kallsyms]) ffffffff83c3206f __x64_sys_mprotect+0x1f ([kernel.kallsyms]) ffffffff845e6692 do_syscall_64+0x62 ([kernel.kallsyms]) ffffffff8360012f entry_SYSCALL_64_after_hwframe+0x76 ([kernel.kal= lsyms]) b00000006 (cookie) ([unknown]) pwd 2312 121.163447: DEFERRED CALLCHAIN [cookie: b00000006] 7f18fe337fa7 mprotect+0x7 (/lib/x86_64-linux-gnu/ld-linux-x86= -64.so.2) 7f18fe330e0f _dl_sysdep_start+0x7f (/lib/x86_64-linux-gnu/ld-= linux-x86-64.so.2) 7f18fe331448 _dl_start_user+0x0 (/lib/x86_64-linux-gnu/ld-lin= ux-x86-64.so.2) Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim --- tools/perf/builtin-script.c | 89 +++++++++++++++++++++++++++++++++ tools/perf/util/evsel_fprintf.c | 5 +- 2 files changed, 93 insertions(+), 1 deletion(-) diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index 011962e1ee0f6898..85b42205a71b3993 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -2706,6 +2706,94 @@ static int process_sample_event(const struct perf_to= ol *tool, return ret; } =20 +static int process_deferred_sample_event(const struct perf_tool *tool, + union perf_event *event, + struct perf_sample *sample, + struct evsel *evsel, + struct machine *machine) +{ + struct perf_script *scr =3D container_of(tool, struct perf_script, tool); + struct perf_event_attr *attr =3D &evsel->core.attr; + struct evsel_script *es =3D evsel->priv; + unsigned int type =3D output_type(attr->type); + struct addr_location al; + FILE *fp =3D es->fp; + int ret =3D 0; + + if (output[type].fields =3D=3D 0) + return 0; + + /* Set thread to NULL to indicate addr_al and al are not initialized */ + addr_location__init(&al); + + if (perf_time__ranges_skip_sample(scr->ptime_range, scr->range_num, + sample->time)) { + goto out_put; + } + + if (debug_mode) { + if (sample->time < last_timestamp) { + pr_err("Samples misordered, previous: %" PRIu64 + " this: %" PRIu64 "\n", last_timestamp, + sample->time); + nr_unordered++; + } + last_timestamp =3D sample->time; + goto out_put; + } + + if (filter_cpu(sample)) + goto out_put; + + if (machine__resolve(machine, &al, sample) < 0) { + pr_err("problem processing %d event, skipping it.\n", + event->header.type); + ret =3D -1; + goto out_put; + } + + if (al.filtered) + goto out_put; + + if (!show_event(sample, evsel, al.thread, &al, NULL)) + goto out_put; + + if (evswitch__discard(&scr->evswitch, evsel)) + goto out_put; + + perf_sample__fprintf_start(scr, sample, al.thread, evsel, + PERF_RECORD_CALLCHAIN_DEFERRED, fp); + fprintf(fp, "DEFERRED CALLCHAIN [cookie: %llx]", + (unsigned long long)event->callchain_deferred.cookie); + + if (PRINT_FIELD(IP)) { + struct callchain_cursor *cursor =3D NULL; + + if (symbol_conf.use_callchain && sample->callchain) { + cursor =3D get_tls_callchain_cursor(); + if (thread__resolve_callchain(al.thread, cursor, evsel, + sample, NULL, NULL, + scripting_max_stack)) { + pr_info("cannot resolve deferred callchains\n"); + cursor =3D NULL; + } + } + + fputc(cursor ? '\n' : ' ', fp); + sample__fprintf_sym(sample, &al, 0, output[type].print_ip_opts, + cursor, symbol_conf.bt_stop_list, fp); + } + + fprintf(fp, "\n"); + + if (verbose > 0) + fflush(fp); + +out_put: + addr_location__exit(&al); + return ret; +} + // Used when scr->per_event_dump is not set static struct evsel_script es_stdout; =20 @@ -4303,6 +4391,7 @@ int cmd_script(int argc, const char **argv) =20 perf_tool__init(&script.tool, !unsorted_dump); script.tool.sample =3D process_sample_event; + script.tool.callchain_deferred =3D process_deferred_sample_event; script.tool.mmap =3D perf_event__process_mmap; script.tool.mmap2 =3D perf_event__process_mmap2; script.tool.comm =3D perf_event__process_comm; diff --git a/tools/perf/util/evsel_fprintf.c b/tools/perf/util/evsel_fprint= f.c index 103984b29b1e10ae..10f1a03c28601e36 100644 --- a/tools/perf/util/evsel_fprintf.c +++ b/tools/perf/util/evsel_fprintf.c @@ -168,7 +168,10 @@ int sample__fprintf_callchain(struct perf_sample *samp= le, int left_alignment, node_al.addr =3D addr; node_al.map =3D map__get(map); =20 - if (print_symoffset) { + if (sample->deferred_callchain && + sample->deferred_cookie =3D=3D node->ip) { + printed +=3D fprintf(fp, "(cookie)"); + } else if (print_symoffset) { printed +=3D __symbol__fprintf_symname_offs(sym, &node_al, print_unknown_as_addr, true, fp); --=20 2.52.0.rc2.455.g230fcf2819-goog