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Tue, 7 Nov 2023 21:58:29 +0000 From: Ankur Arora To: linux-kernel@vger.kernel.org Cc: 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, rostedt@goodmis.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com, Ankur Arora Subject: [RFC PATCH 15/86] Revert "preempt: Restore preemption model selection configs" Date: Tue, 7 Nov 2023 13:57:01 -0800 Message-Id: <20231107215742.363031-16-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231107215742.363031-1-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW4PR04CA0031.namprd04.prod.outlook.com (2603:10b6:303:6a::6) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|BN0PR10MB5048:EE_ X-MS-Office365-Filtering-Correlation-Id: f01641a2-ede1-46cb-e880-08dbdfdcad56 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:01:10 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781944353175968451 X-GMAIL-MSGID: 1781944353175968451 This is a partial revert of commit a8b76910e465d718effce0cad306a21fa4f3526b. There have been some structural changes to init/Makefile so we leave it be. Signed-off-by: Ankur Arora --- include/linux/kernel.h | 2 +- include/linux/vermagic.h | 2 +- kernel/Kconfig.preempt | 42 ++++++++++++++++++++-------------------- kernel/sched/core.c | 6 +++--- 4 files changed, 26 insertions(+), 26 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index cdce553479b4..b9121007fd0b 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -96,7 +96,7 @@ struct completion; struct user; -#ifdef CONFIG_PREEMPT_VOLUNTARY_BUILD +#ifdef CONFIG_PREEMPT_VOLUNTARY extern int __cond_resched(void); # define might_resched() __cond_resched() diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h index a54046bf37e5..e710e3762c52 100644 --- a/include/linux/vermagic.h +++ b/include/linux/vermagic.h @@ -15,7 +15,7 @@ #else #define MODULE_VERMAGIC_SMP "" #endif -#ifdef CONFIG_PREEMPT_BUILD +#ifdef CONFIG_PREEMPT #define MODULE_VERMAGIC_PREEMPT "preempt " #elif defined(CONFIG_PREEMPT_RT) #define MODULE_VERMAGIC_PREEMPT "preempt_rt " diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt index ce77f0265660..60f1bfc3c7b2 100644 --- a/kernel/Kconfig.preempt +++ b/kernel/Kconfig.preempt @@ -1,23 +1,12 @@ # SPDX-License-Identifier: GPL-2.0-only -config PREEMPT_NONE_BUILD - bool - -config PREEMPT_VOLUNTARY_BUILD - bool - -config PREEMPT_BUILD - bool - select PREEMPTION - select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK - choice prompt "Preemption Model" - default PREEMPT_NONE + default PREEMPT_NONE_BEHAVIOUR -config PREEMPT_NONE +config PREEMPT_NONE_BEHAVIOUR bool "No Forced Preemption (Server)" - select PREEMPT_NONE_BUILD if !PREEMPT_DYNAMIC + select PREEMPT_NONE if !PREEMPT_DYNAMIC help This is the traditional Linux preemption model, geared towards throughput. It will still provide good latencies most of the @@ -29,10 +18,10 @@ config PREEMPT_NONE raw processing power of the kernel, irrespective of scheduling latencies. -config PREEMPT_VOLUNTARY +config PREEMPT_VOLUNTARY_BEHAVIOUR bool "Voluntary Kernel Preemption (Desktop)" depends on !ARCH_NO_PREEMPT - select PREEMPT_VOLUNTARY_BUILD if !PREEMPT_DYNAMIC + select PREEMPT_VOLUNTARY if !PREEMPT_DYNAMIC help This option reduces the latency of the kernel by adding more "explicit preemption points" to the kernel code. These new @@ -48,10 +37,10 @@ config PREEMPT_VOLUNTARY Select this if you are building a kernel for a desktop system. -config PREEMPT +config PREEMPT_BEHAVIOUR bool "Preemptible Kernel (Low-Latency Desktop)" depends on !ARCH_NO_PREEMPT - select PREEMPT_BUILD + select PREEMPT help This option reduces the latency of the kernel by making all kernel code (that is not executing in a critical section) @@ -69,7 +58,7 @@ config PREEMPT config PREEMPT_RT bool "Fully Preemptible Kernel (Real-Time)" - depends on EXPERT && ARCH_SUPPORTS_RT + depends on EXPERT && ARCH_SUPPORTS_RT && !PREEMPT_DYNAMIC select PREEMPTION help This option turns the kernel into a real-time kernel by replacing @@ -86,6 +75,17 @@ config PREEMPT_RT endchoice +config PREEMPT_NONE + bool + +config PREEMPT_VOLUNTARY + bool + +config PREEMPT + bool + select PREEMPTION + select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK + config PREEMPT_COUNT bool @@ -95,8 +95,8 @@ config PREEMPTION config PREEMPT_DYNAMIC bool "Preemption behaviour defined on boot" - depends on HAVE_PREEMPT_DYNAMIC && !PREEMPT_RT - select PREEMPT_BUILD + depends on HAVE_PREEMPT_DYNAMIC + select PREEMPT default y help This option allows to define the preemption model on the kernel diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 50e1133cacc9..d3828d90bf84 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7073,13 +7073,13 @@ __setup("preempt=", setup_preempt_mode); static void __init preempt_dynamic_init(void) { if (preempt_dynamic_mode == preempt_dynamic_undefined) { - if (IS_ENABLED(CONFIG_PREEMPT_NONE)) { + if (IS_ENABLED(CONFIG_PREEMPT_NONE_BEHAVIOUR)) { sched_dynamic_update(preempt_dynamic_none); - } else if (IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY)) { + } else if (IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY_BEHAVIOUR)) { sched_dynamic_update(preempt_dynamic_voluntary); } else { /* Default static call setting, nothing to do */ - WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT)); + WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT_BEHAVIOUR)); preempt_dynamic_mode = preempt_dynamic_full; pr_info("Dynamic Preempt: full\n"); }