linux-kernel - Re: [PATCH 1/1] psi: do not require setsched permission from the trigger creator

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Message-ID: <20190801215904.GC2332@hirez.programming.kicks-ass.net>
Date:   Thu, 1 Aug 2019 23:59:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>, axboe@...nel.dk,
        Dennis Zhou <dennis@...nel.org>,
        Dennis Zhou <dennisszhou@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>,
        Nick Kralevich <nnk@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/1] psi: do not require setsched permission from the
 trigger creator

On Thu, Aug 01, 2019 at 11:28:30AM -0700, Suren Baghdasaryan wrote:
> > By marking it FIFO-99 you're in effect saying that your stupid
> > statistics gathering is more important than your life. It will preempt
> > the task that's in control of the band-saw emergency break, it will
> > preempt the task that's adjusting the electromagnetic field containing
> > this plasma flow.
> >
> > That's insane.
> 
> IMHO an opt-in feature stops being "stupid" as soon as the user opted
> in to use it, therefore explicitly indicating interest in it. However
> I assume you are using "stupid" here to indicate that it's "less
> important" rather than it's "useless".

Quite; PSI does have its uses. RT just isn't one of them.