Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
x86: Inline TSC reads in timekeeping
Avoid the overhead of the indirect call for a single instruction to read
the TSC.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163429.741886362@kernel.org
authored by
Thomas Gleixner
and committed by
Peter Zijlstra
b2780118
2e27beeb
+16
+1
arch/x86/Kconfig
+1
arch/x86/Kconfig
···
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select ARCH_USE_SYM_ANNOTATIONS
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select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
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select ARCH_WANT_DEFAULT_BPF_JIT if X86_64
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+
select ARCH_WANTS_CLOCKSOURCE_READ_INLINE if X86_64
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select ARCH_WANTS_DYNAMIC_TASK_STRUCT
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select ARCH_WANTS_NO_INSTR
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select ARCH_WANT_GENERAL_HUGETLB
+14
arch/x86/include/asm/clock_inlined.h
+14
arch/x86/include/asm/clock_inlined.h
···
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+
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_CLOCK_INLINED_H
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#define _ASM_X86_CLOCK_INLINED_H
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#include <asm/tsc.h>
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struct clocksource;
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static __always_inline u64 arch_inlined_clocksource_read(struct clocksource *cs)
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{
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return (u64)rdtsc_ordered();
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}
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#endif