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1753dd1830
The slice state of an mm gets zeroed then initialised upon exec. This is the only caller of slice_set_user_psize now, so that can be removed and instead implement a faster and simplified approach that requires no locking or checking existing state. This speeds up vfork+exec+exit performance on POWER8 by 3%. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
40 lines
1,011 B
C
40 lines
1,011 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_SLICE_H
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#define _ASM_POWERPC_SLICE_H
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#ifdef CONFIG_PPC_BOOK3S_64
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#include <asm/book3s/64/slice.h>
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#elif defined(CONFIG_PPC64)
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#include <asm/nohash/64/slice.h>
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#elif defined(CONFIG_PPC_MMU_NOHASH)
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#include <asm/nohash/32/slice.h>
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#endif
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#ifdef CONFIG_PPC_MM_SLICES
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#ifdef CONFIG_HUGETLB_PAGE
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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#define HAVE_ARCH_UNMAPPED_AREA
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#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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#ifndef __ASSEMBLY__
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struct mm_struct;
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unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
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unsigned long flags, unsigned int psize,
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int topdown);
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unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr);
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void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
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unsigned long len, unsigned int psize);
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void slice_init_new_context_exec(struct mm_struct *mm);
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PPC_MM_SLICES */
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#endif /* _ASM_POWERPC_SLICE_H */
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