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

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Message-ID: <20190801174907.GA16554@cmpxchg.org>
Date:   Thu, 1 Aug 2019 13:49:07 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Peter Zijlstra <peterz@...radead.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 01:13:49PM +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/