From patchwork Tue Sep 17 13:15:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Slavomir Kaslev X-Patchwork-Id: 11148867 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 C48F31708 for ; Tue, 17 Sep 2019 13:15:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ACCB92171F for ; Tue, 17 Sep 2019 13:15:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727666AbfIQNPz (ORCPT ); Tue, 17 Sep 2019 09:15:55 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:45746 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726131AbfIQNPz (ORCPT ); Tue, 17 Sep 2019 09:15:55 -0400 Received: by mail-wr1-f68.google.com with SMTP id r5so3066795wrm.12 for ; Tue, 17 Sep 2019 06:15:51 -0700 (PDT) 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=WaZ65ohUPfGts4oswtqKZg2o5RShSoS4I1z4Ezjoqhs=; b=CtNzaSeQCc84+TvyUkste00D9HM2MwLhOt8smSePcQLf7ztGTahKlPmLc5H/86rRG0 x8b7exYMHrLNybibRFNCbZ6Tn6xtwkwIWIKMwG7HqSLizlkVWZDYHA4b4Xwiedlatlg4 VEInu1ToO2DGlde9Iqz7jq/awkeP2EAbU4TUg2d7ClmWBP5VmYJZ5GZbbHOFV4+KmhFL hNWwr8JTnJk1vZTJNU0KZg++F1DqaJT2eeE3P3xvctWX0KvWaEiAveZbFUc77C4OrMos A4tkQ4Tvplm4c9Iw+LA+iKtXRe8+LEIlDGMOCUBYlm8LT8VUbulcH4y3MJHveJ2q9GYr JpdQ== X-Gm-Message-State: APjAAAXHNgnA1ZIPvujQJkMtQIT6kapGV/A3cvYn8JZEyLXFDf0mqGtf FOiGg6HjKWzMSF8ZpIiaaTANTVp0Ng== X-Google-Smtp-Source: APXvYqx9je6r8Fz2Yl0yRXfl07jX0jHRjWR21E/Uo6nwLgA+7fnAKGYBWBReTpo+eh2wIPUzQ6IdYA== X-Received: by 2002:a5d:4745:: with SMTP id o5mr2884732wrs.125.1568726150948; Tue, 17 Sep 2019 06:15:50 -0700 (PDT) Received: from box.eng.vmware.com ([146.247.46.5]) by smtp.gmail.com with ESMTPSA id d22sm1667265wmb.44.2019.09.17.06.15.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Sep 2019 06:15:50 -0700 (PDT) From: Slavomir Kaslev To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH v14 05/13] trace-cmd: Add buffer instance flags for tracing in guest and agent context Date: Tue, 17 Sep 2019 16:15:30 +0300 Message-Id: <20190917131538.31926-6-kaslevs@vmware.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190917131538.31926-1-kaslevs@vmware.com> References: <20190917131538.31926-1-kaslevs@vmware.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 Add BUFFER_FL_GUEST and BUFFER_FL_AGENT flags to differentiate when trace-record.c is being called to trace guest or the VM tracing agent. Also disable functions talking to the local tracefs when called in recording guest instances context. Signed-off-by: Slavomir Kaslev --- tracecmd/include/trace-local.h | 5 +++ tracecmd/trace-record.c | 58 ++++++++++++++++++++++++++++++++-- 2 files changed, 61 insertions(+), 2 deletions(-) diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h index b017a73..5c42877 100644 --- a/tracecmd/include/trace-local.h +++ b/tracecmd/include/trace-local.h @@ -148,6 +148,8 @@ char *strstrip(char *str); enum buffer_instance_flags { BUFFER_FL_KEEP = 1 << 0, BUFFER_FL_PROFILE = 1 << 1, + BUFFER_FL_GUEST = 1 << 2, + BUFFER_FL_AGENT = 1 << 3, }; struct func_list { @@ -199,6 +201,9 @@ extern struct buffer_instance *first_instance; #define for_all_instances(i) for (i = first_instance; i; \ i = i == &top_instance ? buffer_instances : (i)->next) +#define is_agent(instance) ((instance)->flags & BUFFER_FL_AGENT) +#define is_guest(instance) ((instance)->flags & BUFFER_FL_GUEST) + struct buffer_instance *create_instance(const char *name); void add_instance(struct buffer_instance *instance, int cpu_count); char *get_instance_file(struct buffer_instance *instance, const char *file); diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c index cf734ac..5d8b4f8 100644 --- a/tracecmd/trace-record.c +++ b/tracecmd/trace-record.c @@ -822,6 +822,9 @@ static void __clear_trace(struct buffer_instance *instance) FILE *fp; char *path; + if (is_guest(instance)) + return; + /* reset the trace */ path = get_instance_file(instance, "trace"); fp = fopen(path, "w"); @@ -1339,6 +1342,9 @@ set_plugin_instance(struct buffer_instance *instance, const char *name) char *path; char zero = '0'; + if (is_guest(instance)) + return; + path = get_instance_file(instance, "current_tracer"); fp = fopen(path, "w"); if (!fp) { @@ -1435,6 +1441,9 @@ static void disable_func_stack_trace_instance(struct buffer_instance *instance) int size; int ret; + if (is_guest(instance)) + return; + path = get_instance_file(instance, "current_tracer"); ret = stat(path, &st); tracecmd_put_tracing_file(path); @@ -1628,6 +1637,9 @@ reset_events_instance(struct buffer_instance *instance) int i; int ret; + if (is_guest(instance)) + return; + if (use_old_event_method()) { /* old way only had top instance */ if (!is_top_instance(instance)) @@ -1940,6 +1952,9 @@ static void write_tracing_on(struct buffer_instance *instance, int on) int ret; int fd; + if (is_guest(instance)) + return; + fd = open_tracing_on(instance); if (fd < 0) return; @@ -1959,6 +1974,9 @@ static int read_tracing_on(struct buffer_instance *instance) char buf[10]; int ret; + if (is_guest(instance)) + return -1; + fd = open_tracing_on(instance); if (fd < 0) return fd; @@ -2105,6 +2123,9 @@ static void update_pid_filters(struct buffer_instance *instance) int ret; int fd; + if (is_guest(instance)) + return; + fd = open_instance_fd(instance, "set_event_pid", O_WRONLY | O_CLOEXEC | O_TRUNC); if (fd < 0) @@ -2200,6 +2221,9 @@ static void set_mask(struct buffer_instance *instance) int fd; int ret; + if (is_guest(instance)) + return; + if (!instance->cpumask) return; @@ -2230,6 +2254,9 @@ static void enable_events(struct buffer_instance *instance) { struct event_list *event; + if (is_guest(instance)) + return; + for (event = instance->events; event; event = event->next) { if (!event->neg) update_event(event, event->filter, 0, '1'); @@ -2253,6 +2280,9 @@ static void set_clock(struct buffer_instance *instance) char *content; char *str; + if (is_guest(instance)) + return; + if (!instance->clock) return; @@ -2282,6 +2312,9 @@ static void set_max_graph_depth(struct buffer_instance *instance, char *max_grap char *path; int ret; + if (is_guest(instance)) + return; + path = get_instance_file(instance, "max_graph_depth"); reset_save_file(path, RESET_DEFAULT_PRIO); tracecmd_put_tracing_file(path); @@ -2507,6 +2540,9 @@ static void expand_event_instance(struct buffer_instance *instance) struct event_list *compressed_list = instance->events; struct event_list *event; + if (is_guest(instance)) + return; + reset_event_list(instance); while (compressed_list) { @@ -3394,6 +3430,9 @@ static void set_funcs(struct buffer_instance *instance) int set_notrace = 0; int ret; + if (is_guest(instance)) + return; + ret = write_func_file(instance, "set_ftrace_filter", &instance->filter_funcs); if (ret < 0) die("set_ftrace_filter does not exist. Can not filter functions"); @@ -3690,6 +3729,9 @@ static void set_buffer_size_instance(struct buffer_instance *instance) int ret; int fd; + if (is_guest(instance)) + return; + if (!buffer_size) return; @@ -3900,6 +3942,9 @@ static void make_instances(void) int ret; for_each_instance(instance) { + if (is_guest(instance)) + continue; + path = get_instance_dir(instance); ret = stat(path, &st); if (ret < 0) { @@ -3921,7 +3966,7 @@ void tracecmd_remove_instances(void) for_each_instance(instance) { /* Only delete what we created */ - if (instance->flags & BUFFER_FL_KEEP) + if (is_guest(instance) || (instance->flags & BUFFER_FL_KEEP)) continue; if (instance->tracing_on_fd > 0) { close(instance->tracing_on_fd); @@ -4003,7 +4048,7 @@ static void check_function_plugin(void) static int __check_doing_something(struct buffer_instance *instance) { - return (instance->flags & BUFFER_FL_PROFILE) || + return is_guest(instance) || (instance->flags & BUFFER_FL_PROFILE) || instance->plugin || instance->events; } @@ -4025,6 +4070,9 @@ update_plugin_instance(struct buffer_instance *instance, { const char *plugin = instance->plugin; + if (is_guest(instance)) + return; + if (!plugin) return; @@ -4124,6 +4172,9 @@ static void record_stats(void) int cpu; for_all_instances(instance) { + if (is_guest(instance)) + continue; + s_save = instance->s_save; s_print = instance->s_print; for (cpu = 0; cpu < instance->cpu_count; cpu++) { @@ -4150,6 +4201,9 @@ static void destroy_stats(void) int cpu; for_all_instances(instance) { + if (is_guest(instance)) + continue; + for (cpu = 0; cpu < instance->cpu_count; cpu++) { trace_seq_destroy(&instance->s_save[cpu]); trace_seq_destroy(&instance->s_print[cpu]);