From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id B9A05C433F5
	for <linux-kernel@archiver.kernel.org>; Mon, 16 May 2022 16:23:13 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S245615AbiEPQXK (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 16 May 2022 12:23:10 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40036 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S238917AbiEPQXE (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 16 May 2022 12:23:04 -0400
Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 758FA28E3A;
        Mon, 16 May 2022 09:23:03 -0700 (PDT)
Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140])
        (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
        (No client certificate requested)
        by dfw.source.kernel.org (Postfix) with ESMTPS id 10FE36103A;
        Mon, 16 May 2022 16:23:03 +0000 (UTC)
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C4B1C34113;
        Mon, 16 May 2022 16:23:01 +0000 (UTC)
Date:   Mon, 16 May 2022 12:22:59 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Uladzislau Rezki <urezki@gmail.com>
Cc:     "Paul E. McKenney" <paulmck@kernel.org>,
        Joel Fernandes <joel@joelfernandes.org>,
        Alison Chaiken <achaiken@aurora.tech>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>, RCU <rcu@vger.kernel.org>,
        Frederic Weisbecker <frederic@kernel.org>,
        Neeraj Upadhyay <neeraj.iitr10@gmail.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Subject: Re: [PATCH] rcu/nocb: Add an option to ON/OFF an offloading from RT
 context
Message-ID: <20220516122259.3bc2b3de@gandalf.local.home>
In-Reply-To: <Ynvvto4xcK1dn8iA@pc638.lan>
References: <CAEXW_YQ9t8gxp9cKCpba+e4NZ6ohPr8jHxJYuqRBFRtvSDa0Lw@mail.gmail.com>
        <20220509033740.GM1790663@paulmck-ThinkPad-P17-Gen-1>
        <CAEXW_YSbWetMt2_-m4G9Nt5S8ybATihB+5FMJMMo3jKDG4pPjg@mail.gmail.com>
        <20220509181417.GO1790663@paulmck-ThinkPad-P17-Gen-1>
        <YnldSkaWu40cVimj@pc638.lan>
        <20220510100135.62a4f7df@gandalf.local.home>
        <Ynu8rM42aSyGN7li@pc638.lan>
        <20220511102957.56bd582b@gandalf.local.home>
        <YnvNbRcd3KRfQW3C@pc638.lan>
        <YnvN3PPds3BlZ5fi@pc638.lan>
        <Ynvvto4xcK1dn8iA@pc638.lan>
X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, 11 May 2022 19:17:42 +0200
Uladzislau Rezki <urezki@gmail.com> wrote:

> OK. It was added on the latest kernel:
> 
> root@pc638:/home/urezki# cat /sys/kernel/debug/tracing/trace_pipe
>   vmalloc_test/0-1296    [062] b....    18.157470: 0xffffffffc044e5dc: -> in the local_bh_disable()
> 
> root@pc638:/home/urezki# cat /sys/kernel/debug/tracing/trace
> # tracer: nop
> #
> # entries-in-buffer/entries-written: 0/0   #P:64
> #
> #                                _-----=> irqs-off/BH-disabled
> #                               / _----=> need-resched
> #                              | / _---=> hardirq/softirq
> #                              || / _--=> preempt-depth
> #                              ||| / _-=> migrate-disable
> #                              |||| /     delay
> #           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
> #              | |         |   |||||     |         |
> root@pc638:/home/urezki# uname -a
> Linux pc638 5.17.0-rc2-next-20220201 #63 SMP PREEMPT Tue May 10 20:39:08 CEST 2022 x86_64 GNU/Linux
> root@pc638:/home/urezki#
> 
> so it shows *bh* disabled sections.

Ah yes. That was added with commit 289e7b0f7eb47 ("tracing: Account bottom
half disabled sections."). Maybe I should mark that as stable?

-- Steve