From patchwork Mon May 10 06:16:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Tzvetomir Stoyanov (VMware)" X-Patchwork-Id: 12246947 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4AF7C43462 for ; Mon, 10 May 2021 06:16:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A0C1561155 for ; Mon, 10 May 2021 06:16:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230098AbhEJGSD (ORCPT ); Mon, 10 May 2021 02:18:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230085AbhEJGSD (ORCPT ); Mon, 10 May 2021 02:18:03 -0400 Received: from mail-ej1-x629.google.com (mail-ej1-x629.google.com [IPv6:2a00:1450:4864:20::629]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EEB81C061574 for ; Sun, 9 May 2021 23:16:57 -0700 (PDT) Received: by mail-ej1-x629.google.com with SMTP id m12so22749387eja.2 for ; Sun, 09 May 2021 23:16:57 -0700 (PDT) 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=yFkVFaB+IZA6BqtW2hQugQ3up2arpzUzXZ9gRxPlkcw=; b=O7J0wBzm2ERB52ADHUpFwjiXOBwS/P298IO/vkNCJ1xAqWgcuYHuPYOMGrjlcbr3ow KZtbiONTrbWKXfhXnifdHHrwiU1Y2WK9UgM0yrQaFxEHZrsVHrfoHwL5jCQwKOLUSiZI GuTJXKUzpfTJ19VnItq0tSLZnFG4JVEIzjfmkKF/JCkbQKRp2qza5uqkRWSgAelX7hSb frvIraeUgq7exy1vWxmSeKJWHrRipbw/5cayyx86puFvcfhV8AyVgbNJyqK8eSmt1UlO o0CpmKh8NRwcv8ICoF31fIBifjoNs21skU31H4YlHGQogCWPQcIs6oyABGYdqNub6pKX kJog== 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=yFkVFaB+IZA6BqtW2hQugQ3up2arpzUzXZ9gRxPlkcw=; b=Mrj4LFPZHyMtx/zAFfLfL4VjqDlq8ghuMi1f12QOtjBgRxN60plrgmV7+aIe6/oD4W Kmm+nAY/h8cJK2F08yocTgFCg/PmwU5AUXaeBCcgOGDsG85w0Sj3ibeBHe+zNhY2Khsf W9lj8IRlKrZstVafWbGMauMe0ySiZjq84d4xcv0TwGC13G+AToNwJT1R2QpcxCh7zcTJ X88jc4KwxvXSYOsKVHrRVCMx72vuhXG8FQP5cYfZcksrFDyzH9+B5/CywalyOnU/LhHG iUrCPOHkBxtuh/qTdmoNce20iB4MrXpJAuFYS5n7Y+pnNMOBkYQBKDaXXfoeSo6FpOGj fsdQ== X-Gm-Message-State: AOAM531xWshdRsIxmD2r9znCHYnb0Kbcxlo3cOGLYlGZU82kjn9E+KQA SLzHlwTN5fVgappPzVZeTUD1QoiWPvC06g== X-Google-Smtp-Source: ABdhPJxexFnaPd98J+AgLsx1yh3g99KHZfMEVlx3fC8YJ40wffZ+5rrLcNVPAEn85SGVFbPaYANsbQ== X-Received: by 2002:a17:906:1fca:: with SMTP id e10mr23892162ejt.486.1620627416703; Sun, 09 May 2021 23:16:56 -0700 (PDT) Received: from oberon.zico.biz ([83.222.187.186]) by smtp.gmail.com with ESMTPSA id u3sm5055205eja.25.2021.05.09.23.16.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 May 2021 23:16:56 -0700 (PDT) From: "Tzvetomir Stoyanov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v2 19/21] trace-cmd: Move buffers description outside of options Date: Mon, 10 May 2021 09:16:34 +0300 Message-Id: <20210510061636.1794357-20-tz.stoyanov@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510061636.1794357-1-tz.stoyanov@gmail.com> References: <20210510061636.1794357-1-tz.stoyanov@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org When a new buffer data are written in the trace file, the file offset is stored in the buffer description. As the buffer description is part of the trace options, which are already written in the file, the offset field in this option is updated with the new value. This causes a serious problem when option section of the file is compressed. Updating a value in already compressed section may change the size of this section, which can make the calculated offset of the buffer trace data invalid. To solve that problem and to enable the compression of the option section of the file, the structure of the trace file is changed: - In trace file v7, the description of the buffers is moved to a separate section in the trace file medatata. It is stored after the CPU count section and before the option section. The format of this new buffers description is: 4 bytes - count of the buffers, stored in the file. The top buffer is not counted. For each buffer: 8 bytes, offset of the trace data for this buffer in the file. null-terminated string, name of the buffer. The new section is mandatory, in case of no buffers - the count 0 is stored in the first 4 bytes. - In trace file v6, the description of the buffers is not changed. These changes are needed for compression of the options sections from the trace file. Signed-off-by: Tzvetomir Stoyanov (VMware) --- .../include/private/trace-cmd-private.h | 1 + lib/trace-cmd/trace-input.c | 40 ++++++++++ lib/trace-cmd/trace-output.c | 78 ++++++++++++++++++- tracecmd/trace-dump.c | 24 ++++++ tracecmd/trace-listen.c | 3 + tracecmd/trace-record.c | 4 + 6 files changed, 146 insertions(+), 4 deletions(-) diff --git a/lib/trace-cmd/include/private/trace-cmd-private.h b/lib/trace-cmd/include/private/trace-cmd-private.h index 7d34f27b..d7488346 100644 --- a/lib/trace-cmd/include/private/trace-cmd-private.h +++ b/lib/trace-cmd/include/private/trace-cmd-private.h @@ -112,6 +112,7 @@ enum tracecmd_file_states { TRACECMD_FILE_PRINTK, TRACECMD_FILE_CMD_LINES, TRACECMD_FILE_CPU_COUNT, + TRACECMD_FILE_BUFERS, TRACECMD_FILE_OPTIONS, TRACECMD_FILE_CPU_LATENCY, TRACECMD_FILE_CPU_FLYRECORD, diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c index f3b01db3..8ec9173b 100644 --- a/lib/trace-cmd/trace-input.c +++ b/lib/trace-cmd/trace-input.c @@ -881,6 +881,39 @@ static int read_cpus(struct tracecmd_input *handle) return 0; } +static int read_buffers(struct tracecmd_input *handle) +{ + struct input_buffer_instance *buffer; + unsigned long long offset; + unsigned int count; + int i; + + if (handle->file_version < 7 || handle->file_state >= TRACECMD_FILE_BUFERS) + return 0; + + if (read4(handle, &count) < 0) + return -1; + i = handle->nr_buffers; + handle->nr_buffers += count; + handle->buffers = realloc(handle->buffers, + sizeof(*handle->buffers) * handle->nr_buffers); + if (!handle->buffers) + return -1; + + for (; i < handle->nr_buffers; i++) { + buffer = &handle->buffers[i]; + if (read8(handle, &offset) < 0) + return -1; + buffer->offset = offset; + buffer->name = read_string(handle); + if (!buffer->name) + return -1; + } + + handle->file_state = TRACECMD_FILE_BUFERS; + return 0; +} + /** * tracecmd_read_headers - read the header information from trace.dat * @handle: input handle for the trace.dat file @@ -955,6 +988,13 @@ int tracecmd_read_headers(struct tracecmd_input *handle, if (state <= handle->file_state) return 0; + if (read_buffers(handle) < 0) + return -1; + + if (state <= handle->file_state) + return 0; + + if (read_options_type(handle) < 0) return -1; diff --git a/lib/trace-cmd/trace-output.c b/lib/trace-cmd/trace-output.c index aa55a089..57b11493 100644 --- a/lib/trace-cmd/trace-output.c +++ b/lib/trace-cmd/trace-output.c @@ -376,6 +376,17 @@ static int check_out_state(struct tracecmd_output *handle, int new_state) if (!handle) return -1; + if (handle->file_version < 7) { + switch (new_state) { + case TRACECMD_FILE_BUFERS: + tracecmd_warning("State %d is not supported in trace file version %d", + new_state, handle->file_version); + return -1; + default: + break; + } + } + switch (new_state) { case TRACECMD_FILE_HEADERS: case TRACECMD_FILE_FTRACE_EVENTS: @@ -384,10 +395,16 @@ static int check_out_state(struct tracecmd_output *handle, int new_state) case TRACECMD_FILE_PRINTK: case TRACECMD_FILE_CMD_LINES: case TRACECMD_FILE_CPU_COUNT: - case TRACECMD_FILE_OPTIONS: + case TRACECMD_FILE_BUFERS: if (handle->file_state == (new_state - 1)) return 0; break; + case TRACECMD_FILE_OPTIONS: + if (handle->file_version < 7 && handle->file_state == TRACECMD_FILE_CPU_COUNT) + return 0; + if (handle->file_version >= 7 && handle->file_state == TRACECMD_FILE_BUFERS) + return 0; + break; case TRACECMD_FILE_CPU_LATENCY: case TRACECMD_FILE_CPU_FLYRECORD: if (handle->file_state == TRACECMD_FILE_OPTIONS) @@ -1436,7 +1453,7 @@ int tracecmd_add_buffer_description(struct tracecmd_output *handle, const char * return 0; } -int tracecmd_write_buffers_description(struct tracecmd_output *handle) +static int write_buffers_description_v6(struct tracecmd_output *handle) { struct tracecmd_option *option; struct tracecmd_buffer *buf; @@ -1450,6 +1467,56 @@ int tracecmd_write_buffers_description(struct tracecmd_output *handle) return 0; } +static int write_buffers_description_v7(struct tracecmd_output *handle) +{ + struct tracecmd_buffer *buf; + char *data = NULL; + int count = 0; + int size; + int ret; + + ret = check_out_state(handle, TRACECMD_FILE_BUFERS); + if (ret < 0) { + tracecmd_warning("Cannot write buffers descriptions"); + return ret; + } + + list_for_each_entry(buf, &handle->buffers, list) { + count++; + } + + count = convert_endian_4(handle, count); + ret = do_write_check(handle, &count, 4); + if (ret < 0) + return ret; + + list_for_each_entry(buf, &handle->buffers, list) { + size = 8 + strlen(buf->name) + 1; + data = malloc(size); + if (!data) + goto error; + *(tsize_t *)data = 0; + strcpy(data + 8, buf->name); + /* Save the data location in case it needs to be updated */ + buf->offset = do_lseek(handle, 0, SEEK_CUR); + if (do_write_check(handle, data, size)) + goto error; + } + + handle->file_state = TRACECMD_FILE_BUFERS; + return 0; +error: + return -1; +} + +int tracecmd_write_buffers_description(struct tracecmd_output *handle) +{ + if (handle->file_version >= 7) + return write_buffers_description_v7(handle); + + return write_buffers_description_v6(handle); +} + static tsize_t get_buffer_file_offset(struct tracecmd_output *handle, const char *name) { struct tracecmd_buffer *buf; @@ -1508,7 +1575,8 @@ struct tracecmd_output *tracecmd_create_file_latency(const char *output_file, in if (tracecmd_write_cpus(handle, cpus) < 0) goto out_free; - + if (tracecmd_write_buffers_description(handle) < 0) + goto out_free; if (tracecmd_write_options(handle) < 0) goto out_free; @@ -1701,7 +1769,9 @@ int tracecmd_append_cpu_data(struct tracecmd_output *handle, ret = tracecmd_write_cpus(handle, cpus); if (ret) return ret; - + ret = tracecmd_write_buffers_description(handle); + if (ret) + return ret; ret = tracecmd_write_options(handle); if (ret) return ret; diff --git a/tracecmd/trace-dump.c b/tracecmd/trace-dump.c index ed82104b..d6136360 100644 --- a/tracecmd/trace-dump.c +++ b/tracecmd/trace-dump.c @@ -420,6 +420,29 @@ static void dump_cpus_count(int fd) do_print(SUMMARY, "\t%d [CPUs with tracing data]\n", trace_cpus); } +static void dump_buffers(int fd) +{ + unsigned long long offset; + char name[DUMP_SIZE]; + int count; + + if (file_version < 7) + return; + + if (read_file_number(fd, &count, 4)) + die("cannot read the buffers count"); + do_print(SUMMARY, "\t%d [buffers with tracing data]\n", count); + + while (count) { + if (read_file_number(fd, &offset, 8)) + die("cannot read the buffer offset"); + if (read_file_string(fd, name, DUMP_SIZE)) + die("cannot read the buffer name"); + do_print(SUMMARY, "\t\t %llu %s[data offset, buffer name]\n", offset, name); + count--; + } +} + static void dump_option_string(int fd, int size, char *desc) { do_print(OPTIONS, "\t\t[Option %s, %d bytes]\n", desc, size); @@ -762,6 +785,7 @@ static void dump_file(const char *file) dump_printk(fd); dump_cmdlines(fd); dump_cpus_count(fd); + dump_buffers(fd); dump_therest(fd); tep_free(tep); diff --git a/tracecmd/trace-listen.c b/tracecmd/trace-listen.c index 0ae1c948..62debdb6 100644 --- a/tracecmd/trace-listen.c +++ b/tracecmd/trace-listen.c @@ -604,6 +604,9 @@ static int put_together_file(int cpus, int ofd, const char *node, if (write_options) { ret = tracecmd_write_cpus(handle, cpus); + if (ret) + goto out; + ret = tracecmd_write_buffers_description(handle); if (ret) goto out; ret = tracecmd_write_options(handle); diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c index e12d77cc..5516fe3a 100644 --- a/tracecmd/trace-record.c +++ b/tracecmd/trace-record.c @@ -3653,6 +3653,9 @@ setup_connection(struct buffer_instance *instance, struct common_record_context if (ret) goto error; ret = tracecmd_write_cpus(network_handle, instance->cpu_count); + if (ret) + goto error; + ret = tracecmd_write_buffers_description(network_handle); if (ret) goto error; ret = tracecmd_write_options(network_handle); @@ -3856,6 +3859,7 @@ static void setup_agent(struct buffer_instance *instance, add_options(network_handle, ctx); tracecmd_write_cmdlines(network_handle); tracecmd_write_cpus(network_handle, instance->cpu_count); + tracecmd_write_buffers_description(network_handle); tracecmd_write_options(network_handle); tracecmd_msg_finish_sending_data(instance->msg_handle); instance->network_handle = network_handle;