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Jakub Kicinski
a63bea11d4
Breno Leitao says: ==================== netconsole: Optimize console registration and improve testing During performance analysis of console subsystem latency, I discovered that netconsole registers console handlers even when no active targets exist. These orphaned console handlers are invoked on every printk() call, get the lock, iterate through empty target lists, and consume CPU cycles without performing any useful work. This patch series addresses the inefficiency by: 1. Implementing dynamic console registration/unregistration based on target availability, ensuring console handlers are only active when needed 2. Adding automatic cleanup of unused console registrations when targets are disabled or removed 3. Extending the selftest suite to cover non-extended console format, which was previously untested The optimization reduces printk() overhead by eliminating unnecessary function calls and list traversals when netconsole targets are not configured, improving overall system performance during heavy logging scenarios. v2: https://lore.kernel.org/20250602-netcons_ext-v2-0-ef88d999326d@debian.org v1: https://lore.kernel.org/20250528-netcons_ext-v1-1-69f71e404e00@debian.org ==================== Link: https://patch.msgid.link/20250609-netcons_ext-v3-0-5336fa670326@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.