From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 838E5C2D0DC for ; Thu, 26 Dec 2019 14:07:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 59505206CB for ; Thu, 26 Dec 2019 14:07:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577369232; bh=c2VbXS7A6GBRBIZsYBhBALket98Fg4sAbChfM8QNVas=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QRa9mRBkQsTFRXygtnHN5vZGqsntZ3yC+TN+nUDrMsjPIQOD9YlzHY7LSYhPo7xaj 2xp72rZmYmMvv0lHAKRiotc3CTNtBKlyJI1RlZeblMXTKhWp4ZxtI83oKa3vHWVKBX wMMl5wk8uBE4dd6ADK/idjCDVOEcbOIR0L81Ol+A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727337AbfLZOHL (ORCPT ); Thu, 26 Dec 2019 09:07:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:52706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726450AbfLZOHL (ORCPT ); Thu, 26 Dec 2019 09:07:11 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2EE2A2053B; Thu, 26 Dec 2019 14:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577369229; bh=c2VbXS7A6GBRBIZsYBhBALket98Fg4sAbChfM8QNVas=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XYZtl4a1JC4YGREdSK1yxHkl2kQrCmhs/7AqR8vwIBUNLSasO3iOg4Dn/IIlUdKqa 5x7pjOWGhpBDqcUtDyBqct6qnzU90kkPXFZKEpkeMXI2v2++WYuMSLxZ1wsMnDX/39 12UIL0Y8aQdzfMYClwAFbwFob6+XSg0NHp99hHz4= From: Masami Hiramatsu To: Steven Rostedt , Frank Rowand Cc: Ingo Molnar , Randy Dunlap , Namhyung Kim , Tim Bird , Jiri Olsa , Arnaldo Carvalho de Melo , Tom Zanussi , Rob Herring , Andrew Morton , Thomas Gleixner , Greg Kroah-Hartman , Alexey Dobriyan , Jonathan Corbet , Linus Torvalds , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 16/22] tracing/boot: Add per-event settings Date: Thu, 26 Dec 2019 23:07:02 +0900 Message-Id: <157736922261.11126.12531577742051849539.stgit@devnote2> X-Mailer: git-send-email 2.20.1 In-Reply-To: <157736902773.11126.2531161235817081873.stgit@devnote2> References: <157736902773.11126.2531161235817081873.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add per-event settings for boottime tracing. User can set filter, actions and enable on each event on boot. The event entries are under ftrace.event.GROUP.EVENT node (note that the option key includes event's group name and event name.) This supports below configs. - ftrace.event.GROUP.EVENT.enable Enables GROUP:EVENT tracing. - ftrace.event.GROUP.EVENT.filter = FILTER Set FILTER rule to the GROUP:EVENT. - ftrace.event.GROUP.EVENT.actions = ACTION[, ACTION2...] Set ACTIONs to the GROUP:EVENT. For example, ftrace.event.sched.sched_process_exec { filter = "pid < 128" enable } this will enable tracing "sched:sched_process_exec" event with "pid < 128" filter. Signed-off-by: Masami Hiramatsu --- 0 files changed diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index 4b41310184df..37524031533e 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -56,6 +56,7 @@ trace_boot_set_ftrace_options(struct trace_array *tr, struct xbc_node *node) #ifdef CONFIG_EVENT_TRACING extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); +extern int trigger_process_regex(struct trace_event_file *file, char *buff); static void __init trace_boot_enable_events(struct trace_array *tr, struct xbc_node *node) @@ -74,8 +75,66 @@ trace_boot_enable_events(struct trace_array *tr, struct xbc_node *node) pr_err("Failed to enable event: %s\n", p); } } + +static void __init +trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode, + struct xbc_node *enode) +{ + struct trace_event_file *file; + struct xbc_node *anode; + char buf[MAX_BUF_LEN]; + const char *p, *group, *event; + + group = xbc_node_get_data(gnode); + event = xbc_node_get_data(enode); + + mutex_lock(&event_mutex); + file = find_event_file(tr, group, event); + if (!file) { + pr_err("Failed to find event: %s:%s\n", group, event); + goto out; + } + + p = xbc_node_find_value(enode, "filter", NULL); + if (p && *p != '\0') { + if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) + pr_err("filter string is too long: %s\n", p); + else if (apply_event_filter(file, buf) < 0) + pr_err("Failed to apply filter: %s\n", buf); + } + + xbc_node_for_each_array_value(enode, "actions", anode, p) { + if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) + pr_err("action string is too long: %s\n", p); + else if (trigger_process_regex(file, buf) < 0) + pr_err("Failed to apply an action: %s\n", buf); + } + + if (xbc_node_find_value(enode, "enable", NULL)) { + if (trace_event_enable_disable(file, 1, 0) < 0) + pr_err("Failed to enable event node: %s:%s\n", + group, event); + } +out: + mutex_unlock(&event_mutex); +} + +static void __init +trace_boot_init_events(struct trace_array *tr, struct xbc_node *node) +{ + struct xbc_node *gnode, *enode; + + node = xbc_node_find_child(node, "event"); + if (!node) + return; + /* per-event key starts with "event.GROUP.EVENT" */ + xbc_node_for_each_child(node, gnode) + xbc_node_for_each_child(gnode, enode) + trace_boot_init_one_event(tr, gnode, enode); +} #else #define trace_boot_enable_events(tr, node) do {} while (0) +#define trace_boot_init_events(tr, node) do {} while (0) #endif static void __init @@ -104,6 +163,7 @@ static int __init trace_boot_init(void) return 0; trace_boot_set_ftrace_options(tr, trace_node); + trace_boot_init_events(tr, trace_node); trace_boot_enable_events(tr, trace_node); trace_boot_enable_tracer(tr, trace_node); diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c index 2cd53ca21b51..d8ada4c6f3f7 100644 --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -213,7 +213,7 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file) return ret; } -static int trigger_process_regex(struct trace_event_file *file, char *buff) +int trigger_process_regex(struct trace_event_file *file, char *buff) { char *command, *next = buff; struct event_command *p;