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=-13.1 required=3.0 tests=BAYES_00,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=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 4A573C433E2 for ; Tue, 1 Sep 2020 07:56:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1A4D72098B for ; Tue, 1 Sep 2020 07:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598947018; bh=SwrJXfeH/9hOrMi7XyK/W+RmfZgE720J1M//fWtouGY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=YPo5KlKR+STtWhpr4auLfJcJ7YQenjuX3Gi+55cAycVmb2Hke4WOEGBXJf7FsCafn q8gJCLjUdILQ8smFRiDO9QH1wxDeiwX/mKJc5MnF9hJa0VbnR6N927HbEL9+Yeyss5 K8kRfmahm8tYIbqNhUnbX0go3XMUFfnC8QdhkglU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727115AbgIAH45 (ORCPT ); Tue, 1 Sep 2020 03:56:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:52102 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726044AbgIAH4z (ORCPT ); Tue, 1 Sep 2020 03:56:55 -0400 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 C9B8920684; Tue, 1 Sep 2020 07:56:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598947015; bh=SwrJXfeH/9hOrMi7XyK/W+RmfZgE720J1M//fWtouGY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RSWYb3FZdMrR5NkkW0BvkwjcG0T076vVM6HNBBD9C0v6IDkoOJS7OSMgPWYEPQAZu 2vWZ4t1OMxQdy1u+ztoOWshtyxnJaX/2sXXAtnT3yoEI0INwb5Sk3M+4w3sIcaaq/k NvGGAMOpx3RUGq720r7v/FeiWnK35gMjmENfsV90= From: Masami Hiramatsu To: Steven Rostedt , Jonathan Corbet Cc: mhiramat@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Randy Dunlap , Ingo Molnar Subject: [PATCH v2 2/6] tracing/boot: Add per-instance tracing_on option support Date: Tue, 1 Sep 2020 16:56:51 +0900 Message-Id: <159894701104.1478826.1237212368863627614.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <159894698993.1478826.2813843560314595660.stgit@devnote2> References: <159894698993.1478826.2813843560314595660.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Add per-instance tracing_on option, which will be useful with traceon/traceoff event trigger actions. For example, if we disable tracing_on by default and set traceon and traceoff on a pair of events, we can trace functions between the pair of events. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_boot.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index fa0fc08c6ef8..d52d441a17e8 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -40,6 +40,16 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node) pr_err("Failed to set option: %s\n", buf); } + p = xbc_node_find_value(node, "tracing_on", NULL); + if (p && *p != '\0') { + if (kstrtoul(p, 10, &v)) + pr_err("Failed to set tracing on: %s\n", p); + if (v) + tracer_tracing_on(tr); + else + tracer_tracing_off(tr); + } + p = xbc_node_find_value(node, "trace_clock", NULL); if (p && *p != '\0') { if (tracing_set_clock(tr, p) < 0)