linux-kernel - Re: [PATCH] rcu/nocb: Add an option to ON/OFF an offloading from RT context

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Date:   Mon, 16 May 2022 12:22:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Alison Chaiken <achaiken@...ora.tech>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <neeraj.iitr10@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH] rcu/nocb: Add an option to ON/OFF an offloading from RT
 context

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

> OK. It was added on the latest kernel:
> 
> root@...38:/home/urezki# cat /sys/kernel/debug/tracing/trace_pipe
>   vmalloc_test/0-1296    [062] b....    18.157470: 0xffffffffc044e5dc: -> in the local_bh_disable()
> 
> root@...38:/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@...38:/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@...38:/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