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

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Message-ID: <CAJuCfpHEhK_g5pDhJ3JEu+ioE0xKME56Vs5xmPiUtXH4M0umog@mail.gmail.com>
Date:   Thu, 1 Aug 2019 18:19:07 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
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 1, 2019 at 2:59 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> 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.

Sorry about messing it up in the first place.
If you don't see any issues with my patch replacing
sched_setscheduler() with sched_setscheduler_nocheck(), would you mind
taking it too? I applied it over your patch onto Linus' ToT with no
merge conflicts.
Thanks,
Suren.

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