On Mon, 02 Jun 2025 03:34:40 -0700 Breno Leitao wrote: > 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.
Ah, I wasn't very clear, full form letter at the end. But also the tests seem to have failed now: https://netdev.bots.linux.dev/contest.html?branch=net-next-2025-06-02--12-00&executor=vmksft-net-drv&pw-n=0&pass=0 ## Form letter - net-next-closed Linus has already merged our PR with features for v6.16. net-next is closed for new drivers, features, code refactoring and optimizations for the remained for the merge window. Please repost when net-next reopens after June 9th. RFC patches sent for review only are obviously welcome at any time. See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle -- pw-bot: defer pv-bot: closed
