From: Jakub Kicinski Date: Tue, 10 Jun 2025 21:22:17 +0000 (-0700) Subject: Merge branch 'netconsole-optimize-console-registration-and-improve-testing' X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a63bea11d45523c7ed9f7b927532c810ad52db36;p=thirdparty%2Fkernel%2Flinux.git Merge branch 'netconsole-optimize-console-registration-and-improve-testing' 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 --- a63bea11d45523c7ed9f7b927532c810ad52db36