linux-kernel - [PATCH V7 10/11] sched, x86: Enable nodelay scheduling

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Message-ID: <20250724161625.2360309-11-prakash.sangappa@oracle.com>
Date: Thu, 24 Jul 2025 16:16:24 +0000
From: Prakash Sangappa <prakash.sangappa@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org, rostedt@...dmis.org, mathieu.desnoyers@...icios.com,
        tglx@...utronix.de, bigeasy@...utronix.de, kprateek.nayak@....com,
        vineethr@...ux.ibm.com, prakash.sangappa@...cle.com
Subject: [PATCH V7 10/11] sched, x86: Enable nodelay scheduling

Add the TIF_NEED_RESCHED_NODELAY bit and enable it in Kconfig

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Prakash Sangappa <prakash.sangappa@...cle.com>
---
 arch/x86/Kconfig                   | 1 +
 arch/x86/include/asm/thread_info.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 71019b3b54ea..8925af10b9b5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -101,6 +101,7 @@ config X86
 	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
 	select ARCH_HAS_PMEM_API		if X86_64
 	select ARCH_HAS_PREEMPT_LAZY
+	select ARCH_HAS_PREEMPT_NODELAY
 	select ARCH_HAS_PTE_DEVMAP		if X86_64
 	select ARCH_HAS_PTE_SPECIAL
 	select ARCH_HAS_HW_PTE_YOUNG
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 9282465eea21..00ef128cea9d 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -90,6 +90,7 @@ struct thread_info {
 #define TIF_NEED_RESCHED_LAZY	4	/* Lazy rescheduling needed */
 #define TIF_SINGLESTEP		5	/* reenable singlestep on user return*/
 #define TIF_SSBD		6	/* Speculative store bypass disable */
+#define TIF_NEED_RESCHED_NODELAY	7	/* No delay rescheduling needed */
 #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 */
@@ -114,6 +115,7 @@ struct thread_info {
 #define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
 #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
 #define _TIF_SSBD		(1 << TIF_SSBD)
+#define _TIF_NEED_RESCHED_NODELAY	(1 << TIF_NEED_RESCHED_NODELAY)
 #define _TIF_SPEC_IB		(1 << TIF_SPEC_IB)
 #define _TIF_SPEC_L1D_FLUSH	(1 << TIF_SPEC_L1D_FLUSH)
 #define _TIF_USER_RETURN_NOTIFY	(1 << TIF_USER_RETURN_NOTIFY)
-- 
2.43.5