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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C01FCD3448 for ; Tue, 19 Sep 2023 07:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231710AbjISHVr (ORCPT ); Tue, 19 Sep 2023 03:21:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44952 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231661AbjISHVq (ORCPT ); Tue, 19 Sep 2023 03:21:46 -0400 Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D9B52100 for ; Tue, 19 Sep 2023 00:21:40 -0700 (PDT) Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-40413ccdd4cso31624455e9.0 for ; Tue, 19 Sep 2023 00:21:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695108099; x=1695712899; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=5P1Oj6tRR6D7BKHA36fLGEJKYMNcXL/MMGKc90gm/RQ=; b=NfxMwLBwehuRAB5aTkHADaXsk5cLXeHHbeAjUc8PKhumQAJD4vN5IetPDp5iEc1YFl yg2u4FzRAl0KkFoXT1RZL2wpOtyjuu9pQpWugmAKWdQhmFQIj+VYFFKiMx5eqmVXxhpI 4yrSV30yvauLkbByDA/Lp/yhbUeoDMauVkVJmwTtuMDRicfieATT+Fdkm7JlUqSZB3Lz KG3pDI4InmknmrxNX6sb/b3g2lgwh9cSfKmdSG7q+dWJ5E9Xb+kCnRxgIfvVtmIlUaIY gzWB/GCT4Go8ijiK3CTc3bhekQMT+KFKzxUtP6TnXuDhTsENVrMRQm7MU9GeCQfXXIuK EAaw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695108099; x=1695712899; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5P1Oj6tRR6D7BKHA36fLGEJKYMNcXL/MMGKc90gm/RQ=; b=kCgWU0ah+FeytxKcjzOJ8+i0Ltm52r00qCjujAfW7NSnKEK8kIgwEbEtt5smGQ2QW2 FHX8uGK8Pb/j6KhyDSVtpn8Zs5e++vkSUpnfzpEBBX7RqXpBUVl5+tAQy33a+2yr3rij i+Onnrk5Oqa/NnNsHiryMuZHGCsuGwkkDLgg0uUzTZnd1SK1hB12JQVYXY8LNcIdzZk9 DsPsMK7smEF4Dp5n1U5hDNmhxgMNK+u0wqzOYtPtQGGU+FkFDphAMR2pKkVAh7cOfksy YYprY4ijnNskoWW/3h2CjFwsJbMQl6gqFDZJiomgaIVoix1vMQ6y4PCUFISUypblqG0Y heuQ== X-Gm-Message-State: AOJu0YzmznsHMaElXduX5X+a2uE4hxUVu7lWm+K6e6Mu7cGnZf+wwALQ B6TKbo83zZWlKLiVP8fujX4= X-Google-Smtp-Source: AGHT+IHqM6AMmY3FVHS0y50CbgU2hSHyR/MaH8Pm1yvLKLKYSjZC5d3UtrNokEPpM6jdmMef1grJBA== X-Received: by 2002:a05:600c:286:b0:404:730c:e7c1 with SMTP id 6-20020a05600c028600b00404730ce7c1mr1291132wmk.15.1695108099065; Tue, 19 Sep 2023 00:21:39 -0700 (PDT) Received: from gmail.com (1F2EF265.nat.pool.telekom.hu. [31.46.242.101]) by smtp.gmail.com with ESMTPSA id d18-20020a05600c251200b003fe24df4182sm293735wma.1.2023.09.19.00.21.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Sep 2023 00:21:37 -0700 (PDT) Sender: Ingo Molnar Date: Tue, 19 Sep 2023 09:21:35 +0200 From: Ingo Molnar To: Thomas Gleixner Cc: Peter Zijlstra , Ankur Arora , Linus Torvalds , 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, willy@infradead.org, mgorman@suse.de, rostedt@goodmis.org, 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 Subject: Re: [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED Message-ID: References: <87zg1v3xxh.fsf@oracle.com> <87edj64rj1.fsf@oracle.com> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87cyyfxd4k.ffs@tglx> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Thomas Gleixner wrote: > Additionally we have PREEMPT=FULL which utilizes every zero transition > of preeempt_count as a potential preemption point. Just to complete this nice new entry to Documentation/sched/: in PREEMPT=FULL there's also IRQ-return driven preemption of kernel-mode code, at almost any instruction boundary the hardware allows, in addition to the preemption driven by regular zero transition of preempt_count in syscall/kthread code. Thanks, Ingo