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The check in mte_check_tfsr_el1() is only necessary if HW tag based KASAN is enabled. However, we were also executing the check if MTE is enabled and KASAN is enabled at build time but disabled at runtime. This turned out to cause a measurable increase in power consumption on a specific microarchitecture after enabling MTE. Moreover, on the same system, an increase in invalid syscall latency (as measured by [1]) of around 20-30% (depending on the cluster) was observed after enabling MTE; this almost entirely goes away after removing this check. Therefore, make the check conditional on whether KASAN is enabled rather than on whether MTE is enabled. [1] https://lore.kernel.org/all/CAMn1gO4MwRV8bmFJ_SeY5tsYNPn2ZP56LjAhafygjFaKuu5ouw@mail.gmail.com/ Signed-off-by: Peter Collingbourne <pcc@google.com> Link: https://linux-review.googlesource.com/id/I22d98d1483dd400a95595946552b769a5a1ad7bd Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com> Link: https://lore.kernel.org/r/20240528225131.3577704-1-pcc@google.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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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.