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

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Message-ID: <bc048c18-0ba7-1cb9-90a0-0bc049997c23@kernel.org>
Date:   Fri, 4 Mar 2022 16:37:24 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Nicolas Saenz Julienne <nsaenzju@...hat.com>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        mtosatti@...hat.com, paulmck@...nel.org, rostedt@...dmis.org,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH] tracing/osnoise: Force quiescent states while tracing

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).

> 
> [1] https://lore.kernel.org/lkml/20220302154810.42308-1-frederic@kernel.org/T/#t