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We test 20 million times of getcpu(), the real syscall version take 25 seconds, while the vsyscall version take only 2.4 seconds. Signed-off-by: Rui Wang <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef __ASM_VDSO_H
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#define __ASM_VDSO_H
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#include <linux/mm.h>
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#include <linux/mm_types.h>
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#include <vdso/datapage.h>
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#include <asm/barrier.h>
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/*
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* struct loongarch_vdso_info - Details of a VDSO image.
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* @vdso: Pointer to VDSO image (page-aligned).
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* @size: Size of the VDSO image (page-aligned).
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* @off_rt_sigreturn: Offset of the rt_sigreturn() trampoline.
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* @code_mapping: Special mapping structure for vdso code.
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* @code_mapping: Special mapping structure for vdso data.
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*
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* This structure contains details of a VDSO image, including the image data
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* and offsets of certain symbols required by the kernel. It is generated as
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* part of the VDSO build process, aside from the mapping page array, which is
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* populated at runtime.
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*/
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struct loongarch_vdso_info {
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void *vdso;
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unsigned long size;
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unsigned long offset_sigreturn;
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struct vm_special_mapping code_mapping;
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struct vm_special_mapping data_mapping;
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};
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extern struct loongarch_vdso_info vdso_info;
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#endif /* __ASM_VDSO_H */
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