linux-kernel - Re: Arches that don't support PREEMPT

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Date:   Tue, 19 Sep 2023 18:22:46 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     anton ivanov <anton.ivanov@...bridgegreys.com>
Cc:     tglx <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Matthew Wilcox <willy@...radead.org>,
        torvalds <torvalds@...ux-foundation.org>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, x86 <x86@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>, bp <bp@...en8.de>,
        dave hansen <dave.hansen@...ux.intel.com>, hpa <hpa@...or.com>,
        mingo <mingo@...hat.com>, juri lelli <juri.lelli@...hat.com>,
        vincent guittot <vincent.guittot@...aro.org>, mgorman@...e.de,
        Steven Rostedt <rostedt@...dmis.org>,
        jon grimm <jon.grimm@....com>, bharata@....com,
        raghavendra kt <raghavendra.kt@....com>,
        boris ostrovsky <boris.ostrovsky@...cle.com>,
        konrad wilk <konrad.wilk@...cle.com>, jgross <jgross@...e.com>,
        andrew cooper3 <andrew.cooper3@...rix.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um <linux-um@...ts.infradead.org>,
        Brian Cain <bcain@...cinc.com>, linux-hexagon@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        linux-alpha <linux-alpha@...r.kernel.org>
Subject: Re: Arches that don't support PREEMPT

----- Ursprüngliche Mail -----
> Von: "anton ivanov" <anton.ivanov@...bridgegreys.com>
> It's been a while. I remember that I dropped it at the time, but do not remember
> the full details.
> 
> There was some stuff related to FP state and a few other issues I ran into while
> rewriting the interrupt controller. Some of it may be resolved by now as we are
> using host cpu flags, etc.

I remember also having a hacky but working version almost 10 years ago.
It was horrible slow because of the extra scheduler rounds.
But yes, if PREEMPT will be a must-have feature we'll have to try again.

Thanks,
//richard