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1d10f3aec2
Implement arch_raw_cpu_ptr() in C to allow the compiler to perform better optimizations, such as setting an appropriate base to compute the address. The compiler is free to choose either MOV or ADD from this_cpu_off address to construct the optimal final address. There are some other issues when memory access to the percpu area is implemented with an asm. Compilers can not eliminate asm common subexpressions over basic block boundaries, but are extremely good at optimizing memory access. By implementing arch_raw_cpu_ptr() in C, the compiler can eliminate additional redundant loads from this_cpu_off, further reducing the number of percpu offset reads from 1646 to 1631 on a test build, a -0.9% reduction. Co-developed-by: Nadav Amit <namit@vmware.com> Signed-off-by: Nadav Amit <namit@vmware.com> Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Uros Bizjak <ubizjak@gmail.com> Cc: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20231015202523.189168-2-ubizjak@gmail.com |
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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 | ||
| .cocciconfig | ||
| .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 Restructured Text 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.