From: Richard Weinberger <richard@nod.at>
To: anton ivanov <anton.ivanov@cambridgegreys.com>
Cc: tglx <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
Matthew Wilcox <willy@infradead.org>,
torvalds <torvalds@linux-foundation.org>,
Ankur Arora <ankur.a.arora@oracle.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>, x86 <x86@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>, bp <bp@alien8.de>,
dave hansen <dave.hansen@linux.intel.com>, hpa <hpa@zytor.com>,
mingo <mingo@redhat.com>, juri lelli <juri.lelli@redhat.com>,
vincent guittot <vincent.guittot@linaro.org>,
mgorman@suse.de, Steven Rostedt <rostedt@goodmis.org>,
jon grimm <jon.grimm@amd.com>,
bharata@amd.com, raghavendra kt <raghavendra.kt@amd.com>,
boris ostrovsky <bori>
Subject: Re: Arches that don't support PREEMPT
Date: Tue, 19 Sep 2023 18:22:46 +0200 (CEST) [thread overview]
Message-ID: <551475267.58816.1695140566849.JavaMail.zimbra@nod.at> (raw)
In-Reply-To: <9a5c0856-d542-9912-7494-53d7fe4538a3@cambridgegreys.com>
----- Ursprüngliche Mail -----
> Von: "anton ivanov" <anton.ivanov@cambridgegreys.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
next prev parent reply other threads:[~2023-09-19 16:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87edj64rj1.fsf@oracle.com>
[not found] ` <CAHk-=wi0bXpgULVVLc2AdJcta-fvQP7yyFQ_JtaoHUiPrqf--A@mail.gmail.com>
[not found] ` <87zg1u1h5t.fsf@oracle.com>
[not found] ` <CAHk-=whMkp68vNxVn1H3qe_P7n=X2sWPL9kvW22dsvMFH8FcQQ@mail.gmail.com>
[not found] ` <20230911150410.GC9098@noisy.programming.kicks-ass.net>
[not found] ` <87h6o01w1a.fsf@oracle.com>
[not found] ` <20230912082606.GB35261@noisy.programming.kicks-ass.net>
[not found] ` <87cyyfxd4k.ffs@tglx>
[not found] ` <CAHk-=whnwC01m_1f-gaM1xbvvwzwTiKitrWniA-ChZv+bM03dg@mail.gmail.com>
[not found] ` <87led2wdj0.ffs@tglx>
2023-09-19 13:00 ` Arches that don't support PREEMPT Matthew Wilcox
2023-09-19 13:34 ` Geert Uytterhoeven
2023-09-19 13:37 ` John Paul Adrian Glaubitz
2023-09-19 13:42 ` Peter Zijlstra
2023-09-19 13:48 ` John Paul Adrian Glaubitz
2023-09-19 14:16 ` Peter Zijlstra
2023-09-19 14:24 ` John Paul Adrian Glaubitz
2023-09-19 14:32 ` Matthew Wilcox
2023-09-19 15:31 ` Steven Rostedt
2023-09-20 14:38 ` Anton Ivanov
2023-09-21 12:20 ` Arnd Bergmann
2023-09-19 14:17 ` Thomas Gleixner
2023-09-19 14:50 ` H. Peter Anvin
2023-09-19 14:57 ` Matt Turner
2023-09-19 17:09 ` Ulrich Teichert
2023-09-19 17:25 ` Linus Torvalds
2023-09-19 17:58 ` John Paul Adrian Glaubitz
2023-09-19 18:31 ` Thomas Gleixner
2023-09-19 18:38 ` Steven Rostedt
2023-09-19 18:52 ` Linus Torvalds
2023-09-19 19:53 ` Thomas Gleixner
2023-09-20 7:32 ` Ingo Molnar
2023-09-20 7:29 ` Ingo Molnar
2023-09-20 8:26 ` Thomas Gleixner
2023-09-20 10:37 ` David Laight
2023-09-19 14:21 ` Anton Ivanov
2023-09-19 15:17 ` Thomas Gleixner
2023-09-19 15:21 ` Anton Ivanov
2023-09-19 16:22 ` Richard Weinberger [this message]
2023-09-19 16:41 ` Anton Ivanov
2023-09-19 17:33 ` Thomas Gleixner
2023-10-06 14:51 ` Geert Uytterhoeven
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