linux-kernel - Re: [PATCH RFC v2 tip/core/rcu 14/22] rcu-tasks: Add an RCU Tasks Trace to simplify protection of tracing hooks

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Message-ID: <20200320024152.GM3199@paulmck-ThinkPad-P72>
Date:   Thu, 19 Mar 2020 19:41:53 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com,
        dipankar@...ibm.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, dhowells@...hat.com,
        edumazet@...gle.com, fweisbec@...il.com, oleg@...hat.com,
        joel@...lfernandes.org,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH RFC v2 tip/core/rcu 14/22] rcu-tasks: Add an RCU Tasks
 Trace to simplify protection of tracing hooks

On Thu, Mar 19, 2020 at 08:48:38PM -0400, Steven Rostedt wrote:
> On Thu, 19 Mar 2020 17:28:13 -0700
> "Paul E. McKenney" <paulmck@...nel.org> wrote:
> 
> > Good point.  If interrupts are disabled, it will need to use some
> > other mechanism.  One approach is irqwork.  Another is a timer.
> > 
> > Suggestions?
> 
> Ftrace and perf use irq_work, I would think that should work here too.

Sounds good, will give it a go!  And thank you for catching this!

							Thans, Paul