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4972226d0dOmar Sandoval <osandov@osandov.com> says: The performance of /proc/kcore reads has been showing up as a bottleneck for drgn. drgn scripts often spend ~25% of their time in the kernel reading from /proc/kcore. A lot of this overhead comes from silly inefficiencies. This patch series fixes the low-hanging fruit. The fixes are all fairly small and straightforward. The result is a 25% improvement in read latency in micro-benchmarks (from ~235 nanoseconds to ~175) and a 15% improvement in execution time for real-world drgn scripts. Since I have a stake in /proc/kcore and have modified it several times, the final patch volunteers me to maintain it. * patches from https://lore.kernel.org/r/cover.1731115587.git.osandov@fb.com: MAINTAINERS: add me as /proc/kcore maintainer proc/kcore: use percpu_rw_semaphore for kclist_lock proc/kcore: don't walk list on every read proc/kcore: mark proc entry as permanent Link: https://lore.kernel.org/r/cover.1731115587.git.osandov@fb.com Signed-off-by: Christian Brauner <brauner@kernel.org> |
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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.