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

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Message-ID: <20190801210203.GA3578@hirez.programming.kicks-ass.net>
Date:   Thu, 1 Aug 2019 23:02:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/5] sched/pci: Reduce psimon FIFO priority

On Thu, Aug 01, 2019 at 01:49:07PM -0400, Johannes Weiner 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>

Thanks!

> Subject should be s/pci/psi/

Yeah, already fixed that.. obviously one sees such typoes only after
sending ;-)