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=-5.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 58901C352A3 for ; Fri, 14 Feb 2020 02:28:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 17EEF217F4 for ; Fri, 14 Feb 2020 02:28:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="C+QKtt6i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728295AbgBNC2o (ORCPT ); Thu, 13 Feb 2020 21:28:44 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:37530 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727669AbgBNC2n (ORCPT ); Thu, 13 Feb 2020 21:28:43 -0500 Received: by mail-pl1-f194.google.com with SMTP id c23so3129586plz.4; Thu, 13 Feb 2020 18:28:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=C4IOnB+fnAI63RVs1D18HOwt87luoRvhyKaupr5pIOI=; b=C+QKtt6iINZJWgDIuAGJrZJh3OCHxD691wPY+cCb+4m3gY8gphafyhFjOsEVX906zh ph6eQl+SwkXTQf4l7E6hPI+i68oEarj8zAu2PyX7BKJWA+X7r4EGtOT+q3LtyjVuZkg5 ZOPCLL8HhsNPk0DWbJxGcyHA6QY2Xi0Xx4dRdw89kl/Lp1K/joY8aNyL4pu0FXgQhfsv mtkfamScoy8bcwFbgVnBLWjdw2QgDljmpmpOUnNfwIoEFmR4PVlBSXjgekWc5K5mvZKS 6aD+XBQ60xVBSrpV3SR9FvEhsbtZ/4bWLMxprDTU0dV+9rz+n1k0RX4z8XiyaZF09ljJ lZFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=C4IOnB+fnAI63RVs1D18HOwt87luoRvhyKaupr5pIOI=; b=avWJu5pVWGjBQemLlKuA9aUfWLDilQdkjAj7zUley4WxRcECUw28t/SwM7P2bfjKo6 4BGr6INTc2TvC3/NtR6djgcy1g/a/iKqBzmIG+XQ/9RAhYkMhrJQCSVvA2M034ySV2Ur AAd1ixAp3mGzQxlkojt9qqd6fm99cFSG0llQRAuhHUrFmNAB5u04B8daDhb2dxFE+jl6 HK3y5EagBkqrhwPwyMq+/Z8kZd6H4e+bdNdIWpb4Vi0TuWCArZxEShlcs1VYMd93fa5F FYpTPf8rDrnS1LmlFYjCv1hutTrqlVuLedV1J2vaJ5c6t9tsBjaHM6tJ7SLSuNDKkbcq 1YRg== X-Gm-Message-State: APjAAAVpSmXSyDtyB1PkgXq98qbPVWq6WX60dyFmFKeK8Lo8FOE3iZNC KUa//i59gOPvehVg7xioN7qXQxF4 X-Google-Smtp-Source: APXvYqysmvQH4I+SeH5DEAQx8Jqwb1QR7MI6ER9QrNNigIajV1q/MPLbd+h3SicnL9/W/BEplOMQ6w== X-Received: by 2002:a17:902:7797:: with SMTP id o23mr931393pll.298.1581647321769; Thu, 13 Feb 2020 18:28:41 -0800 (PST) Received: from localhost ([2401:fa00:8f:203:5bbb:c872:f2b1:f53b]) by smtp.gmail.com with ESMTPSA id l73sm4709372pge.44.2020.02.13.18.28.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Feb 2020 18:28:40 -0800 (PST) Date: Fri, 14 Feb 2020 11:28:39 +0900 From: Sergey Senozhatsky To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, rostedt@goodmis.org, mingo@kernel.org, joel@joelfernandes.org, gregkh@linuxfoundation.org, gustavo@embeddedor.com, tglx@linutronix.de, paulmck@kernel.org, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com Subject: Re: [PATCH v2 9/9] perf,tracing: Allow function tracing when !RCU Message-ID: <20200214022839.GG36551@google.com> References: <20200212210139.382424693@infradead.org> <20200212210750.312024711@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200212210750.312024711@infradead.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (20/02/12 22:01), Peter Zijlstra wrote: > Since perf is now able to deal with !rcu_is_watching() contexts, > remove the restraint. > > Signed-off-by: Peter Zijlstra (Intel) > --- > kernel/trace/trace_event_perf.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > --- a/kernel/trace/trace_event_perf.c > +++ b/kernel/trace/trace_event_perf.c > @@ -477,7 +477,7 @@ static int perf_ftrace_function_register > { > struct ftrace_ops *ops = &event->ftrace_ops; > > - ops->flags = FTRACE_OPS_FL_RCU; > + ops->flags = 0; FTRACE_OPS_FL_ENABLED? -ss