linux-kernel - Re: [PATCH] tracing/osnoise: Force quiescent states while tracing

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Message-ID: <20220304162644.GO4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Fri, 4 Mar 2022 08:26:44 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Nicolas Saenz Julienne <nsaenzju@...hat.com>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>, mingo@...hat.com,
        linux-kernel@...r.kernel.org, mtosatti@...hat.com,
        rostedt@...dmis.org, Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH] tracing/osnoise: Force quiescent states while tracing

On Fri, Mar 04, 2022 at 04:55:06PM +0100, Nicolas Saenz Julienne wrote:
> On Fri, 2022-03-04 at 16:37 +0100, Daniel Bristot de Oliveira wrote:
> > On 3/4/22 16:28, Nicolas Saenz Julienne wrote:
> > > Some comments:
> > >  - You're not exiting/entering EQS on IRQ/NMI entry/exit. See
> > >    irqentry_{enter,exit}() and irqentry_nmi_{enter,exit}().
> > 
> > hummm, right!
> > 
> > >  - See this series[1], if we ever pursue this approach, it's important we got
> > >    through context tracking, instead of poking at RCU directly.
> > 
> > I had a test patch with context_tracking as well... entering and leaving using
> > it. Lemme find it.... but it basically works in the same way as for RCU (or
> > pretend to work).
> 
> Yes, agree, it's fundamentally the same.

And there is work in flight to make it even more the same.  ;-)

https://lore.kernel.org/all/20220302154810.42308-1-frederic@kernel.org/

							Thanx, Paul