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 D925EC4332F for ; Tue, 7 Nov 2023 23:30:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344474AbjKGXap (ORCPT ); Tue, 7 Nov 2023 18:30:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344523AbjKGXaX (ORCPT ); Tue, 7 Nov 2023 18:30:23 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C45C22707 for ; Tue, 7 Nov 2023 15:26:40 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87A71C433C7; Tue, 7 Nov 2023 23:26:36 +0000 (UTC) Date: Tue, 7 Nov 2023 18:26:37 -0500 From: Steven Rostedt To: Ankur Arora Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, paulmck@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, 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, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com Subject: Re: [RFC PATCH 31/86] x86/thread_info: add TIF_NEED_RESCHED_LAZY Message-ID: <20231107182637.20f71eba@gandalf.local.home> In-Reply-To: <20231107215742.363031-32-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> <20231107215742.363031-32-ankur.a.arora@oracle.com> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 7 Nov 2023 13:57:17 -0800 Ankur Arora wrote: > Add a new flag, TIF_NEED_RESCHED_LAZY which with TIF_NEED_RESCHED > gives the scheduler two levels of rescheduling priority: > TIF_NEED_RESCHED means that rescheduling happens at the next > opportunity; TIF_NEED_RESCHED_LAZY is used to note that a > reschedule is needed but does not impose any other constraints > on the scheduler. Please add: Link: https://lore.kernel.org/lkml/87cyyfxd4k.ffs@tglx/ Link: https://lore.kernel.org/lkml/87jzshhexi.ffs@tglx/ For each of the patches that were based off of Thomas's patch. Thanks! -- Steve > > Originally-by: Thomas Gleixner > Signed-off-by: Ankur Arora > --- > arch/x86/include/asm/thread_info.h | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h > index d63b02940747..114d12120051 100644 > --- a/arch/x86/include/asm/thread_info.h > +++ b/arch/x86/include/asm/thread_info.h > @@ -81,8 +81,9 @@ struct thread_info { > #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ > #define TIF_SIGPENDING 2 /* signal pending */ > #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ > -#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ > -#define TIF_SSBD 5 /* Speculative store bypass disable */ > +#define TIF_NEED_RESCHED_LAZY 4 /* Lazy rescheduling */ > +#define TIF_SINGLESTEP 5 /* reenable singlestep on user return*/ > +#define TIF_SSBD 6 /* Speculative store bypass disable */ > #define TIF_SPEC_IB 9 /* Indirect branch speculation mitigation */ > #define TIF_SPEC_L1D_FLUSH 10 /* Flush L1D on mm switches (processes) */ > #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ > @@ -104,6 +105,7 @@ struct thread_info { > #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) > #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) > #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) > +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) > #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) > #define _TIF_SSBD (1 << TIF_SSBD) > #define _TIF_SPEC_IB (1 << TIF_SPEC_IB)