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Marchesi" , Beau Belgrave , Jens Remus , Linus Torvalds , Andrew Morton , Jens Axboe Subject: [PATCH v11 10/11] perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED References: <20250625231541.584226205@goodmis.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Rspamd-Server: rspamout05 X-Rspamd-Queue-Id: C86A660016 X-Stat-Signature: ncra71ccokaaamoepgob6uqbks8d5udc X-Session-Marker: 6E657665747340676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX19chmM/tjRXnbjXfhUBl1ia12u36QB0Tes= X-HE-Tag: 1750986530-778693 X-HE-Meta: U2FsdGVkX1+24g6/mU4ddjpqDRmDTQOB2dug6+orqRZjgMsZDL6R2hybGP++7zF1vsXGOuq6DF53a5ynVLtGbCjEiJ40/oyA2OgULrn/j+GpwHm18hQcOVnwuXmDL0USm2tlW6KvO4/TwaMzP99j4h4TE1QDyqjb4nIwGgp4LhQMn8Ay/n2aaeZr2iRxY5oRFakB/9ney9ts/9g1XiY8PDb0lqI0lrDQuAOXNwomiua4n17ItURmYXij4d6beXQiRERhRzb/Y8+TEoSsYz9l3nnBKFK7h9QLFKOusH1AYggWX1dhQS/emJjKfXHuF6bz6fYtZoDIjqnZbcBLcDDroKalRM+7Y83ZyD0hCr8epEGHTWhNQfB5vk9qe4WfYsCyaLSRxJ6mwnmpuiKvWhZzfRo+FKRUX42PEyOU3fznPGA= From: Namhyung Kim Handle the deferred callchains in the script output. $ perf script perf 801 [000] 18.031793: 1 cycles:P: ffffffff91a14c36 __intel_pmu_enable_all.isra.0+0x56 ([kernel.kallsyms]) ffffffff91d373e9 perf_ctx_enable+0x39 ([kernel.kallsyms]) ffffffff91d36af7 event_function+0xd7 ([kernel.kallsyms]) ffffffff91d34222 remote_function+0x42 ([kernel.kallsyms]) ffffffff91c1ebe1 generic_exec_single+0x61 ([kernel.kallsyms]) ffffffff91c1edac smp_call_function_single+0xec ([kernel.kallsyms]) ffffffff91d37a9d event_function_call+0x10d ([kernel.kallsyms]) ffffffff91d33557 perf_event_for_each_child+0x37 ([kernel.kallsyms]) ffffffff91d47324 _perf_ioctl+0x204 ([kernel.kallsyms]) ffffffff91d47c43 perf_ioctl+0x33 ([kernel.kallsyms]) ffffffff91e2f216 __x64_sys_ioctl+0x96 ([kernel.kallsyms]) ffffffff9265f1ae do_syscall_64+0x9e ([kernel.kallsyms]) ffffffff92800130 entry_SYSCALL_64+0xb0 ([kernel.kallsyms]) perf 801 [000] 18.031814: DEFERRED CALLCHAIN 7fb5fc22034b __GI___ioctl+0x3b (/usr/lib/x86_64-linux-gnu/libc.so.6) Signed-off-by: Namhyung Kim Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) --- tools/perf/builtin-script.c | 89 +++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c index 6c3bf74dd78c..a6f8209256fe 100644 --- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -2483,6 +2483,93 @@ static int process_sample_event(const struct perf_tool *tool, return ret; } +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 = container_of(tool, struct perf_script, tool); + struct perf_event_attr *attr = &evsel->core.attr; + struct evsel_script *es = evsel->priv; + unsigned int type = output_type(attr->type); + struct addr_location al; + FILE *fp = es->fp; + int ret = 0; + + if (output[type].fields == 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 = 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 = -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"); + + if (PRINT_FIELD(IP)) { + struct callchain_cursor *cursor = NULL; + + if (symbol_conf.use_callchain && sample->callchain) { + cursor = 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 = 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; @@ -4069,6 +4156,7 @@ int cmd_script(int argc, const char **argv) perf_tool__init(&script.tool, !unsorted_dump); script.tool.sample = process_sample_event; + script.tool.callchain_deferred = process_deferred_sample_event; script.tool.mmap = perf_event__process_mmap; script.tool.mmap2 = perf_event__process_mmap2; script.tool.comm = perf_event__process_comm; @@ -4095,6 +4183,7 @@ int cmd_script(int argc, const char **argv) script.tool.throttle = process_throttle_event; script.tool.unthrottle = process_throttle_event; script.tool.ordering_requires_timestamps = true; + script.tool.merge_deferred_callchains = false; session = perf_session__new(&data, &script.tool); if (IS_ERR(session)) return PTR_ERR(session); -- 2.47.2