From patchwork Tue Dec 3 10:35:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Tzvetomir Stoyanov (VMware)" X-Patchwork-Id: 11270959 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6DD481AA3 for ; Tue, 3 Dec 2019 10:35:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42B0520684 for ; Tue, 3 Dec 2019 10:35:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PuP5lavG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726086AbfLCKfp (ORCPT ); Tue, 3 Dec 2019 05:35:45 -0500 Received: from mail-lf1-f67.google.com ([209.85.167.67]:44762 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726186AbfLCKfo (ORCPT ); Tue, 3 Dec 2019 05:35:44 -0500 Received: by mail-lf1-f67.google.com with SMTP id v201so2467991lfa.11 for ; Tue, 03 Dec 2019 02:35:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wcQL78XUCyajNt4YlqnV1DffF7NrC/gu/1/VE/NGmdc=; b=PuP5lavGrtAGfGs1cKNbdTC1mS8RYGYcbo/tvhXvuPDFbxXBI9kL1vIHb2jl/Yyxav L70uWVJaLYuYQaWtUYZSczmUiOmlTUWYbsEMRDq+ZpQlEM7h46P91sM/M1HVm8NGgQtz 9MLsizXpLrYJuy9nT/oSE8jCxZgnbN8xsnKOL8h4ScaR+qGG3ORlYuULtQTUf1expfdh TzblCMBMTvswqtzkbB6H5acCSKleSLyWcuAPsv0xP+61qli5kXYMQDuIdmSI+yeYN4LD 9K0I4Dg4WyQSOk12/gNA1Erp61E0CrWdWTSk2vVJ4ZPK2HpvrCIJILJ1ejhSIjEtXwNM S9iA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=wcQL78XUCyajNt4YlqnV1DffF7NrC/gu/1/VE/NGmdc=; b=dlxqg0gENyj/E4Yh+UyJoAkUxNgesw1ffWEXKoHWypEkVcEK3dJZ2hzfFhYj4vqg6E 69ZvEnwxNWRog00FR+P39Gh7XZ6WuI5g70+3K+ApU46xDG3Plksi58S2q9UYHZqQwnd5 Nbwh8aNIbmSsE0qIx/zj5bmkSEgLxEfO1beTkj2MBAq2pdURkLFwULiIBPQ1ZWVvTMwu f+WAd0rMl5RVAnRCvDHDj2lsonwilk7A+CSf/yQeShG55K1ad4+/K/rUjl2ZDaQDLd06 t93CCMU2M8+eW+DGHw6VbKeSunZ14L8kvtdPxfBURLALwCK2GxBcAkJ3O6thht4NKTRe zJHQ== X-Gm-Message-State: APjAAAXaRUmxNNC0izT9UcGqNTGtvcVM4qRKmS/NHTG42t+W/X555r/1 w0ADOMkfXk839Bon4tN+qeY5rDSje6Q= X-Google-Smtp-Source: APXvYqwwPRTdFNSPfv7jZ17/GGBHRm85Wvzft89/Rlo0s3cNBs86dHBGmx44/QYgB89Cq0UFBGopTw== X-Received: by 2002:ac2:4adc:: with SMTP id m28mr2275671lfp.26.1575369341898; Tue, 03 Dec 2019 02:35:41 -0800 (PST) Received: from oberon.eng.vmware.com ([146.247.46.5]) by smtp.gmail.com with ESMTPSA id t9sm1053023lfl.51.2019.12.03.02.35.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Dec 2019 02:35:41 -0800 (PST) From: "Tzvetomir Stoyanov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v17 13/18] trace-cmd: Add guest information in host's trace.dat file Date: Tue, 3 Dec 2019 12:35:17 +0200 Message-Id: <20191203103522.482684-14-tz.stoyanov@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191203103522.482684-1-tz.stoyanov@gmail.com> References: <20191203103522.482684-1-tz.stoyanov@gmail.com> MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org New trace.dat option is introduced: TRACECMD_OPTION_GUEST. Written in the host's trace.dat file, it contains information about guests, traced at the same time: guest trace ID, number of VCPUs and PIDs of the host tasks, running those VCPU. The data is stored in the file as NULL terminated string: "Guest %s %llu %d\n" -> guest name, number of VCPUs "%d %d\n" -> VCPU, PID of host task ..... "%d %d\n" -> VCPU, PID of host task Signed-off-by: Tzvetomir Stoyanov (VMware) --- include/trace-cmd/trace-cmd.h | 1 + lib/trace-cmd/trace-input.c | 113 ++++++++++++++++++++++++++++++++++ tracecmd/trace-record.c | 45 ++++++++++++++ 3 files changed, 159 insertions(+) diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index 1240b4a..17badf2 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -88,6 +88,7 @@ enum { TRACECMD_OPTION_PROCMAPS, TRACECMD_OPTION_TRACEID, TRACECMD_OPTION_TIME_SHIFT, + TRACECMD_OPTION_GUEST, }; enum { diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c index a6b675a..e36ebaa 100644 --- a/lib/trace-cmd/trace-input.c +++ b/lib/trace-cmd/trace-input.c @@ -79,6 +79,14 @@ struct ts_offset_sample { long long offset; }; +struct guest_trace_info { + struct guest_trace_info *next; + char *name; + unsigned long long trace_id; + int vcpu_count; + int *cpu_pid; +}; + struct host_trace_info { bool sync_enable; unsigned long long trace_id; @@ -112,6 +120,7 @@ struct tracecmd_input { char * trace_clock; struct input_buffer_instance *buffers; int parsing_failures; + struct guest_trace_info *guest; struct tracecmd_ftrace finfo; @@ -2294,6 +2303,73 @@ static int trace_traceid_load(struct tracecmd_input *handle, char *buf) return -1; } +static void trace_guests_free(struct tracecmd_input *handle) +{ + struct guest_trace_info *guest; + + while (handle->guest) { + guest = handle->guest; + handle->guest = handle->guest->next; + free(guest->name); + free(guest->cpu_pid); + free(guest); + } +} + +static int trace_guest_load(struct tracecmd_input *handle, char *buf) +{ + struct guest_trace_info *guest = NULL; + unsigned long long tid; + char *line; + int cpu, pid; + + line = strchr(buf, '\n'); + if (!line) + goto error; + *line = '\0'; + + guest = calloc(1, sizeof(struct guest_trace_info)); + if (!guest) + goto error; + + if (sscanf(buf, "%*s %ms %llu %d", &guest->name, &tid, &cpu) != 3) + goto error; + guest->trace_id = tid; + guest->vcpu_count = cpu; + + guest->cpu_pid = calloc(guest->vcpu_count, sizeof(int)); + if (!guest->cpu_pid) + goto error; + + buf = line + 1; + line = strchr(buf, '\n'); + while (line) { + *line = '\0'; + if (sscanf(buf, "%d %d", &cpu, &pid) != 2) + goto error; + + if (cpu < guest->vcpu_count) + guest->cpu_pid[cpu] = pid; + buf = line + 1; + if (!*buf) + break; + + line = strchr(buf, '\n'); + } + + guest->next = handle->guest; + handle->guest = guest; + return 0; + +error: + if (guest) { + free(guest->cpu_pid); + free(guest->name); + free(guest); + } + return -1; +} + #define STR_PROCMAP_LINE_MAX (PATH_MAX+22) static int trace_pid_map_load(struct tracecmd_input *handle, char *buf) { @@ -2558,6 +2634,10 @@ static int handle_options(struct tracecmd_input *handle) if (buf[size-1] == '\0') trace_traceid_load(handle, buf); break; + case TRACECMD_OPTION_GUEST: + if (buf[size-1] == '\0') + trace_guest_load(handle, buf); + break; default: warning("unknown option %d", option); break; @@ -3217,6 +3297,7 @@ void tracecmd_close(struct tracecmd_input *handle) handle->pid_maps = NULL; trace_tsync_offset_free(&handle->host); + trace_guests_free(handle); if (handle->flags & TRACECMD_FL_BUFFER_INSTANCE) tracecmd_close(handle->parent); @@ -3673,6 +3754,38 @@ unsigned long long tracecmd_get_traceid(struct tracecmd_input *handle) return handle->trace_id; } +/** + * tracecmd_get_guest_cpumap - get the mapping of guest VCPU to host process + * @handle: input handle for the trace.dat file + * @trace_id: ID of the guest tracing session + * + * Returns @name of the guest, number of VPUs (@vcpu_count) + * and array @cpu_pid with size @vcpu_count. Array index is VCPU id, array + * content is PID of the host process, running this VCPU. + * + * This information is stored in host trace.dat file + */ +int tracecmd_get_guest_cpumap(struct tracecmd_input *handle, + unsigned long long trace_id, + char *name, + int *vcpu_count, int *cpu_pid) +{ + struct guest_trace_info *guest = handle->guest; + + while (guest) { + if (guest->trace_id == trace_id) + break; + guest = guest->next; + } + if (!guest) + return -1; + + name = guest->name; + *vcpu_count = guest->vcpu_count; + cpu_pid = guest->cpu_pid; + return 0; +} + /** * tracecmd_get_tsync_peer - get the trace session id of the peer host * @handle: input handle for the trace.dat file diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c index e51134f..49730d6 100644 --- a/tracecmd/trace-record.c +++ b/tracecmd/trace-record.c @@ -2884,6 +2884,19 @@ struct guest { static struct guest *guests; static size_t guests_len; +static struct guest *get_guest_info(unsigned int guest_cid) +{ + int i; + + if (!guests) + return NULL; + + for (i = 0; i < guests_len; i++) + if (guest_cid == guests[i].cid) + return guests + i; + return NULL; +} + static char *get_qemu_guest_name(char *arg) { char *tok, *end = arg; @@ -3689,6 +3702,33 @@ static void append_buffer(struct tracecmd_output *handle, } } +static void +add_guest_info(struct tracecmd_output *handle, struct buffer_instance *instance) +{ + struct guest *guest = get_guest_info(instance->cid); + struct trace_seq s; + int i; + + if (!guest) + return; + for (i = 0; i < VCPUS_MAX; i++) + if (!guest->cpu_pid[i]) + break; + + trace_seq_init(&s); + + trace_seq_printf(&s, "Guest %s %llu %d\n", + guest->name, instance->trace_id, i); + for (i = 0; i < VCPUS_MAX; i++) { + if (!guest->cpu_pid[i]) + break; + trace_seq_printf(&s, "%d %d\n", i, guest->cpu_pid[i]); + } + trace_seq_terminate(&s); + tracecmd_add_option(handle, TRACECMD_OPTION_GUEST, + s.len + 1, s.buffer); + trace_seq_destroy(&s); +} static void add_pid_maps(struct tracecmd_output *handle, struct buffer_instance *instance) @@ -3976,6 +4016,11 @@ static void record_data(struct common_record_context *ctx) add_pid_maps(handle, instance); } + for_all_instances(instance) { + if (is_guest(instance)) + add_guest_info(handle, instance); + } + tracecmd_append_cpu_data(handle, local_cpu_count, temp_files); for (i = 0; i < max_cpu_count; i++)