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06fc959fcf
Implement the required arch functions to enable use of contpte in the vmap when VM_ALLOW_HUGE_VMAP is specified. This speeds up vmap operations due to only having to issue a DSB and ISB per contpte block instead of per pte. But it also means that the TLB pressure reduces due to only needing a single TLB entry for the whole contpte block. Since vmap uses set_huge_pte_at() to set the contpte, that API is now used for kernel mappings for the first time. Although in the vmap case we never expect it to be called to modify a valid mapping so clear_flush() should never be called, it's still wise to make it robust for the kernel case, so amend the tlb flush function if the mm is for kernel space. Tested with vmalloc performance selftests: # kself/mm/test_vmalloc.sh \ run_test_mask=1 test_repeat_count=5 nr_pages=256 test_loop_count=100000 use_huge=1 Duration reduced from 1274243 usec to 1083553 usec on Apple M2 for 15% reduction in time taken. Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> Tested-by: Luiz Capitulino <luizcap@redhat.com> Link: https://lore.kernel.org/r/20250422081822.1836315-10-ryan.roberts@arm.com Signed-off-by: Will Deacon <will@kernel.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.