From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C85D7CE79A8 for ; Tue, 19 Sep 2023 19:53:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:References :In-Reply-To:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fjU9HRovra5yibcoHGEo91c1puma2b1NjARtxBrotSs=; b=UhYBSiUipl1hUH VYCQNXkvHcPIlwR4bAmXUbGrg4iK8dOLkEohglqBf8CC0cRyv7cfPGA8j31iQRODnQpO1cGlhj7Jy 9Pj9P1JBZar57ild5OnRDICVqnrNpnaWGShdnm5d8mhSeObV6OwFr2X2c4V1+v6MRNsVGWs4vOX/M a+b0flFli1ds0Re3O0zQO6i5r5ecd4OkN2xmGMoDibf1FWG5u6zvRW3cylHZAuX2qSL6BFWjlvQ0C Zv1/7JY86QfTjN784SOzv/wgcPDy/NtKvJCXPeefGf6IAxg5GuL/N+ujHtVqrRaY8+pRrTc9p8PT9 D5DyZ98QA8pkneSKY56Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qigmX-001Bdq-1h; Tue, 19 Sep 2023 19:53:13 +0000 Received: from galois.linutronix.de ([2a0a:51c0:0:12e:550::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qigmV-001Bco-1A for linux-um@lists.infradead.org; Tue, 19 Sep 2023 19:53:12 +0000 From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1695153187; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Z6MR2qg7K68Ikjp5YKoXbgk+KfdFV5OyH5X+XZI8Hys=; b=mOb/eNZUdC0Wj3l6CxvHBXP8mwAJuYFnOVgDDGyXCVGfE9qGC/lTBJMdjrY5OSdh22ztlP 0pmpPVdeREqTDHGNAEeNvS1DieP+VUS9naCyvjQLxXHFNIP7ZMrmMpAb/G7OBUsq8HkoXh Cf2s4EE0LCAMh9WCn8yLJcvMdWe4fgVs+RUHjyvJHQe1wc5lXIfPpDuHsf3M3vaqIXgsMB c1zOM7RIRJi9+pTWs8ld1rHuTaEkuhd5s6SL99eLVBOi2BmjT9kDN+s+XFm70ynEg0DH68 vw1rGuAKizG2OM9QTS2IvcNs1PTtQ9WH7K2vOYlgdiHCWVPYnna48qBKdgNrMA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1695153187; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Z6MR2qg7K68Ikjp5YKoXbgk+KfdFV5OyH5X+XZI8Hys=; b=L3qg/U5CuhkLaMEQDfDZJ0Bp292wap1ObMBS0Fd+vVbQEdDuD8p1gEYpDfgtKABKvVsKv+ 70jMfd8FpBl2jmDQ== To: Linus Torvalds , Steven Rostedt Cc: John Paul Adrian Glaubitz , Peter Zijlstra , Matthew Wilcox , Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Brian Cain , linux-hexagon@vger.kernel.org, Richard Henderson , Ivan Kokshaysky , Matt Turner , linux-alpha@vger.kernel.org Subject: Re: Arches that don't support PREEMPT In-Reply-To: References: <87zg1u1h5t.fsf@oracle.com> <20230911150410.GC9098@noisy.programming.kicks-ass.net> <87h6o01w1a.fsf@oracle.com> <20230912082606.GB35261@noisy.programming.kicks-ass.net> <87cyyfxd4k.ffs@tglx> <87led2wdj0.ffs@tglx> <0e69f7df80dc5878071deb0d80938138d19de1d1.camel@physik.fu-berlin.de> <20230919134218.GA39281@noisy.programming.kicks-ass.net> <87pm2eui95.ffs@tglx> <20230919143816.1741760a@gandalf.local.home> Date: Tue, 19 Sep 2023 21:53:07 +0200 Message-ID: <87jzsmueho.ffs@tglx> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230919_125311_548184_0809C282 X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Tue, Sep 19 2023 at 11:52, Linus Torvalds wrote: > On Tue, 19 Sept 2023 at 11:37, Steven Rostedt wrote: >> >> We could simply leave the cond_resched() around but defined as nops for >> everything but the "nostalgia club" to keep them from having any regressions. > > I doubt the nostalgia club cares about some latencies (that are > usually only noticeable under extreme loads anyway). > > And if they do, maybe that would make somebody sit down and look into > doing it right. > > So I think keeping it around would actually be both useless and > counter-productive. Amen to that. _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um