Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
From: Phil Auld <pauld@xxxxxxxxxx>
Date: Tue, 12 Sep 2023 08:24:37 -0400
Cc: Ankur Arora <ankur.a.arora@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, luto@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, mingo@xxxxxxxxxx, juri.lelli@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, willy@xxxxxxxxxxxxx, mgorman@xxxxxxx, rostedt@xxxxxxxxxxx, tglx@xxxxxxxxxxxxx, jon.grimm@xxxxxxx, bharata@xxxxxxx, raghavendra.kt@xxxxxxx, boris.ostrovsky@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx, jgross@xxxxxxxx, andrew.cooper3@xxxxxxxxxx
In-reply-to: <20230912082606.GB35261@noisy.programming.kicks-ass.net>
References: <20230908070258.GA19320@noisy.programming.kicks-ass.net> <87zg1v3xxh.fsf@oracle.com> <CAHk-=whagwHrDxhjUVrRPhq78YC195KrSGzuC722-4MvAz40pw@mail.gmail.com> <87edj64rj1.fsf@oracle.com> <CAHk-=wi0bXpgULVVLc2AdJcta-fvQP7yyFQ_JtaoHUiPrqf--A@mail.gmail.com> <87zg1u1h5t.fsf@oracle.com> <CAHk-=whMkp68vNxVn1H3qe_P7n=X2sWPL9kvW22dsvMFH8FcQQ@mail.gmail.com> <20230911150410.GC9098@noisy.programming.kicks-ass.net> <87h6o01w1a.fsf@oracle.com> <20230912082606.GB35261@noisy.programming.kicks-ass.net>

On Tue, Sep 12, 2023 at 10:26:06AM +0200 Peter Zijlstra wrote:
> On Mon, Sep 11, 2023 at 10:04:17AM -0700, Ankur Arora wrote:
> > 
> > How expensive would be always having PREEMPT_COUNT=y?
> 
> Effectively I think that is true today. At the very least Debian and
> SuSE (I can't find a RHEL .config in a hurry but I would think they too)
> ship with PREEMPT_DYNAMIC=y.
>

Yes, RHEL too.

Cheers,
Phil

--

References:
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Peter Zijlstra
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Ankur Arora
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Linus Torvalds
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Ankur Arora
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Linus Torvalds
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Ankur Arora
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Linus Torvalds
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Peter Zijlstra
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Ankur Arora
- Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED
  - From: Peter Zijlstra

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