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([38.41.223.211]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b428ba4cf35sm3705433a12.14.2025.08.07.19.07.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Aug 2025 19:07:14 -0700 (PDT) From: Pierrick Bouvier To: pierrick.bouvier@linaro.org, qemu-devel@nongnu.org Cc: Mahmoud Mandour , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , rowan Hart , Gustavo Romero , Manos Pitsidianakis , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Peter Maydell , Richard Henderson Subject: [PATCH v5 6/9] contrib/plugins/uftrace: generate additional files for uftrace Date: Thu, 7 Aug 2025 19:06:59 -0700 Message-ID: <20250808020702.410109-7-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250808020702.410109-1-pierrick.bouvier@linaro.org> References: <20250808020702.410109-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102d; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pj1-x102d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Beyond traces per cpu, uftrace expect to find some specific files. - info: contains information about machine/program run those values are not impacting uftrace behaviour, and we simply copied a random example to keep things simple. - memory mapping: how every binary is mapped in memory. For system mode, we generate an empty mapping (uftrace_symbols.py, coming in future commit, will take care of that). For user mode, we copy current /proc/self/maps. We don't need to do any special filtering, as reported addresses will necessarily concern guest program, and not QEMU and its libraries. - task: list of tasks. We present every vcpu/privilege level as a separate process, as it's the best view we can have when generating a (visual) chrome trace. Using threads is less convenient in terms of UI. Signed-off-by: Pierrick Bouvier --- contrib/plugins/uftrace.c | 130 +++++++++++++++++++++++++++++++++++++- 1 file changed, 129 insertions(+), 1 deletion(-) diff --git a/contrib/plugins/uftrace.c b/contrib/plugins/uftrace.c index 7737626da2f..6628b4256fd 100644 --- a/contrib/plugins/uftrace.c +++ b/contrib/plugins/uftrace.c @@ -115,6 +115,126 @@ static uint64_t gettime_ns(void) return now_ns; } +static void uftrace_write_map(bool system_emulation) +{ + const char *path = "./uftrace.data/sid-0.map"; + + if (system_emulation && access(path, F_OK) == 0) { + /* do not erase existing map in system emulation, as a custom one might + * already have been generated by uftrace_symbols.py */ + return; + } + + FILE *sid_map = fopen(path, "w"); + g_assert(sid_map); + + if (system_emulation) { + fprintf(sid_map, + "# map stack on highest address possible, to prevent uftrace\n" + "# from considering any kernel address\n"); + fprintf(sid_map, + "ffffffffffff-ffffffffffff rw-p 00000000 00:00 0 [stack]\n"); + } else { + /* in user mode, copy /proc/self/maps instead */ + FILE *self_map = fopen("/proc/self/maps", "r"); + g_assert(self_map); + for (;;) { + int c = fgetc(self_map); + if (c == EOF) { + break; + } + fputc(c, sid_map); + } + fclose(self_map); + } + fclose(sid_map); +} + +static void uftrace_write_task(const GArray *traces) +{ + FILE *task = fopen("./uftrace.data/task.txt", "w"); + g_assert(task); + for (int i = 0; i < traces->len; ++i) { + Trace *t = g_array_index(traces, Trace*, i); + fprintf(task, "SESS timestamp=0.0 pid=%"PRIu32" sid=0 exename=\"%s\"\n", + t->id, t->name->str); + fprintf(task, "TASK timestamp=0.0 tid=%"PRIu32" pid=%"PRIu32"\n", + t->id, t->id); + } + fclose(task); +} + +static void uftrace_write_info(const GArray *traces) +{ + g_autoptr(GString) taskinfo_tids = g_string_new("taskinfo:tids="); + for (int i = 0; i < traces->len; ++i) { + Trace *t = g_array_index(traces, Trace*, i); + const char *delim = i > 0 ? "," : ""; + g_string_append_printf(taskinfo_tids, "%s%"PRIu32, delim, t->id); + } + + g_autoptr(GString) taskinfo_nr_tid = g_string_new("taskinfo:nr_tid="); + g_string_append_printf(taskinfo_nr_tid, "%d", traces->len); + + FILE *info = fopen("./uftrace.data/info", "w"); + g_assert(info); + /* + * $ uftrace dump --debug + * uftrace file header: magic = 4674726163652100 + * uftrace file header: version = 4 + * uftrace file header: header size = 40 + * uftrace file header: endian = 1 (little) + * uftrace file header: class = 2 (64 bit) + * uftrace file header: features = 0x1263 (PLTHOOK | ... + * uftrace file header: info = 0x7bff (EXE_NAME | ... + * <0000000000000000>: 46 74 72 61 63 65 21 00 04 00 00 00 28 00 01 02 + * <0000000000000010>: 63 12 00 00 00 00 00 00 ff 7b 00 00 00 00 00 00 + * <0000000000000020>: 00 04 00 00 00 00 00 00 + */ + const uint8_t header[] = {0x46, 0x74, 0x72, 0x61, 0x63, 0x65, 0x21, 0x00, + 0x04, 0x00, 0x00, 0x00, 0x28, 0x00, 0x01, 0x02, + 0x63, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xff, 0x7b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; + fwrite(header, sizeof(header), 1, info); + const char *info_data[] = { + "exename:from_qemu", + "build_id:0123456789abcdef0123456789abcdef01234567", + "exit_status:0", + "cmdline:uftrace record qemu", + "cpuinfo:lines=2", + "cpuinfo:nr_cpus=1 / 1 (online/possible)", + "cpuinfo:desc=Intel 8086", + "meminfo:1.0 / 1.0 GB (free / total)", + "osinfo:lines=3", + "osinfo:kernel=Linux 6.12.33", + "osinfo:hostname=pc", + "osinfo:distro=\"Debian GNU/Linux 13 (trixie)\"", + "taskinfo:lines=2", + taskinfo_nr_tid->str, + taskinfo_tids->str, + "usageinfo:lines=6", + "usageinfo:systime=0.000000", + "usageinfo:usrtime=0.000000", + "usageinfo:ctxsw=0 / 0 (voluntary / involuntary)", + "usageinfo:maxrss=8016", + "usageinfo:pagefault=0 / 0 (major / minor)", + "usageinfo:iops=0 / 0 (read / write)", + "loadinfo:0.0 / 0.0 / 0.0", + "record_date:Mon Jan 1 00:00:00 2025", + "elapsed_time:1000000000000.0 sec", + "pattern_type:regex", + "uftrace_version:v0.17 ( x86_64 dwarf python3 luajit tui perf sched dynamic kernel )", + "utc_offset:1751552954", + 0}; + const char **info_data_it = info_data; + while (*(info_data_it)) { + fprintf(info, "%s\n", *info_data_it); + ++info_data_it; + } + fclose(info); +} + static Callstack *callstack_new(void) { Callstack *cs = g_new0(Callstack, 1); @@ -607,14 +727,22 @@ static void vcpu_end(unsigned int vcpu_index) static void at_exit(qemu_plugin_id_t id, void *data) { + bool system_emulation = (bool) data; + g_autoptr(GArray) traces = g_array_new(0, 0, sizeof(Trace *)); + for (size_t i = 0; i < qemu_plugin_num_vcpus(); ++i) { Cpu *cpu = qemu_plugin_scoreboard_find(score, i); for (size_t j = 0; j < cpu->traces->len; ++j) { Trace *t = g_array_index(cpu->traces, Trace*, j); trace_flush(t, true); + g_array_append_val(traces, t); } } + uftrace_write_map(system_emulation); + uftrace_write_info(traces); + uftrace_write_task(traces); + for (size_t i = 0; i < qemu_plugin_num_vcpus(); ++i) { vcpu_end(i); } @@ -651,7 +779,7 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, score = qemu_plugin_scoreboard_new(sizeof(Cpu)); qemu_plugin_register_vcpu_init_cb(id, vcpu_init); - qemu_plugin_register_atexit_cb(id, at_exit, NULL); + qemu_plugin_register_atexit_cb(id, at_exit, (void *) info->system_emulation); qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans); return 0; -- 2.47.2