linux-kernel - Re: [PATCH 1/5] sched/pci: Reduce psimon FIFO priority

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Message-ID: <CAJuCfpGQsfQ8QW7_LJzsGgTj6H9r6bV529Mzv-dXCWiv+qjOpw@mail.gmail.com>
Date:   Thu, 1 Aug 2019 11:31:30 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/5] sched/pci: Reduce psimon FIFO priority

On Thu, Aug 1, 2019 at 10:49 AM Johannes Weiner <hannes@...xchg.org> wrote:
>
> On Thu, Aug 01, 2019 at 01:13:49PM +0200, Peter Zijlstra wrote:
> > PSI defaults to a FIFO-99 thread, reduce this to FIFO-1.
> >
> > FIFO-99 is the very highest priority available to SCHED_FIFO and
> > it not a suitable default; it would indicate the psi work is the
> > most important work on the machine.
> >
> > Since Real-Time tasks will have pre-allocated memory and locked it in
> > place, Real-Time tasks do not care about PSI. All it needs is to be
> > above OTHER.
> >
> > Cc: Suren Baghdasaryan <surenb@...gle.com>
> > Cc: Johannes Weiner <hannes@...xchg.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
>
> Subject should be s/pci/psi/

Thanks for the patch. Please give me a couple hours for testing to
ensure no regressions before merging it.