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830fd2d45a
Pass around const pointers to struct slice_mask where possible, rather than copies of slice_mask, to reduce stack and call overhead. checkstack.pl gives, before: 0x00000d1c slice_get_unmapped_area [slice.o]: 592 0x00001864 is_hugepage_only_range [slice.o]: 448 0x00000754 slice_find_area_topdown [slice.o]: 400 0x00000484 slice_find_area_bottomup.isra.1 [slice.o]: 272 0x000017b4 slice_set_range_psize [slice.o]: 224 0x00000a4c slice_find_area [slice.o]: 128 0x00000160 slice_check_fit [slice.o]: 112 after: 0x00000ad0 slice_get_unmapped_area [slice.o]: 448 0x00001464 is_hugepage_only_range [slice.o]: 288 0x000006c0 slice_find_area [slice.o]: 144 0x0000016c slice_check_fit [slice.o]: 128 0x00000528 slice_find_area_bottomup.isra.2 [slice.o]: 128 0x000013e4 slice_set_range_psize [slice.o]: 128 This increases vfork+exec+exit performance by 1.5%. Reduces time to mmap+munmap a 64kB page by 17%. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.