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Tue, 19 Sep 2023 18:22:47 +0200 (CEST) Received: from lithops.sigma-star.at (lithops.sigma-star.at [195.201.40.130]) by lithops.sigma-star.at (Postfix) with ESMTP id 16951635DB51; Tue, 19 Sep 2023 18:22:47 +0200 (CEST) Date: Tue, 19 Sep 2023 18:22:46 +0200 (CEST) From: Richard Weinberger To: anton ivanov Cc: tglx , Peter Zijlstra , John Paul Adrian Glaubitz , Matthew Wilcox , torvalds , Ankur Arora , linux-kernel , linux-mm , x86 , Andrew Morton , Andy Lutomirski , bp , dave hansen , hpa , mingo , juri lelli , vincent guittot , mgorman@suse.de, Steven Rostedt , jon grimm , bharata@amd.com, raghavendra kt , boris ostrovsky , konrad wilk , jgross , andrew cooper3 , Geert Uytterhoeven , linux-m68k , Johannes Berg , linux-um , Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha Message-ID: <551475267.58816.1695140566849.JavaMail.zimbra@nod.at> In-Reply-To: <9a5c0856-d542-9912-7494-53d7fe4538a3@cambridgegreys.com> References: <87zg1u1h5t.fsf@oracle.com> <87led2wdj0.ffs@tglx> <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> <20230919134218.GA39281@noisy.programming.kicks-ass.net> <87y1h2ur98.ffs@tglx> <9a5c0856-d542-9912-7494-53d7fe4538a3@cambridgegreys.com> Subject: Re: Arches that don't support PREEMPT MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [195.201.40.130] X-Mailer: Zimbra 8.8.12_GA_3807 (ZimbraWebClient - FF97 (Linux)/8.8.12_GA_3809) Thread-Topic: Arches that don't support PREEMPT Thread-Index: bIFTlUwZ+xXV2WWntYYwoPsb2f3c+g== X-Stat-Signature: xmm88doeot5siawanxinyrte4oe7zdak X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5AE8010002B X-Rspam-User: X-HE-Tag: 1695140570-331646 X-HE-Meta: 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 OFE8fb6I 0fHa6iaRhzpDJK+vfjR6g1A7GwQSHBkyt2JcicIWrhxqHfW+yXVXovTUO3V77uqBysuQSf3zSjEEoXCg/ou//f55YQUGMNJ3qeCY6L0qn0hkhv1l/+J733v0r5w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: ----- Urspr=C3=BCngliche Mail ----- > Von: "anton ivanov" > It's been a while. I remember that I dropped it at the time, but do not r= emember > the full details. >=20 > There was some stuff related to FP state and a few other issues I ran int= o 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