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 B50B0C43467 for ; Sat, 10 Oct 2020 22:55:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 756322075E for ; Sat, 10 Oct 2020 22:55:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602370558; bh=Z3Ej4a7qHPar4eVGK2pzL8sYBK4axe/bt5/w4LxbGfI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FiXlMvmT9JCdr2+dmJAFGxce3acrpSLfXN/+3cJUbxezhwnpOF9QszLo0Dox0ECez MmVug3eu4HGjjvRqCuWCr9TS6Z2Cct9TZKCD+mdbYnoYcnOL7B8DQUKjYc9gNDQ82S 1/Ma08VsoPoQcPYMZIDdRzgmgVP9xBCHj+O1x8E8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389812AbgJJWzx (ORCPT ); Sat, 10 Oct 2020 18:55:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:52248 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731478AbgJJT1V (ORCPT ); Sat, 10 Oct 2020 15:27:21 -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 F35F722370; Sat, 10 Oct 2020 15:28:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602343693; bh=Z3Ej4a7qHPar4eVGK2pzL8sYBK4axe/bt5/w4LxbGfI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SbzevZFtHyNPvYjjDelg7q5HunVbJBMMSEFMRl+X/FC+o9+BTT01dE3lcGS4VrYnt epeizqqH9WZ3G/eFeVLkjvtv3ANA8+6Wocv1vgt0s2hq7uS087rv7Pyndt+nGDOSo5 JE6ZfBxBG3wI4fXm+TOz9sbBXJu34e+hh76pKeGc= From: Masami Hiramatsu To: Steven Rostedt Cc: Tom Zanussi , Masami Hiramatsu , linux-kernel@vger.kernel.org Subject: [PATCH 1/1] tracing/boot: Add ftrace.instance.*.alloc_snapshot option Date: Sun, 11 Oct 2020 00:28:09 +0900 Message-Id: <160234368948.400560.15313384470765915015.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <160234368056.400560.6282640165007466754.stgit@devnote2> References: <160234368056.400560.6282640165007466754.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add ftrace.instance.*.alloc_snapshot option. This option has been described in Documentation/trace/boottime-trace.rst but not implemented yet. ftrace.[instance.INSTANCE.]alloc_snapshot Allocate snapshot buffer. The difference from kernel.alloc_snapshot is that the kernel.alloc_snapshot will allocate the buffer only for the main instance, but this can allocate buffer for any new instances. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_boot.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index 754e3cf2df3a..c22a152ef0b4 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -284,6 +284,12 @@ trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node) if (tracing_set_tracer(tr, p) < 0) pr_err("Failed to set given tracer: %s\n", p); } + + /* Since tracer can free snapshot buffer, allocate snapshot here.*/ + if (xbc_node_find_value(node, "alloc_snapshot", NULL)) { + if (tracing_alloc_snapshot_instance(tr) < 0) + pr_err("Failed to allocate snapshot buffer\n"); + } } static void __init