CVS commit: src/sys/kern

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Fri Jan  2 04:40:26 UTC 2026

Modified Files:
        src/sys/kern: kern_lock.c

Log Message:
KERNEL_LOCK(9): Improve diagnostics when hogging kernel lock.

1. Log diagnostics unconditionally, even if !LOCKDEBUG -- only put the
   _KERNEL_LOCK_ABORT("spinout") under LOCKDEBUG.

2. Spin up to ten seconds (not 0x0fffffff iterations of the loop), as
   measured by getticks() and hz, before logging diagnostics.

3. Avoid printing anything if it was already printed in the last ten
   seconds.

This uses a somewhat grody symbol alias hack to keep the declaration
of kernel_lock intact so it doesn't require changes in sys/lock.h or
its users.

kern/59870: kernel lock runtime diagnostics are difficult


To generate a diff of this commit:
cvs rdiff -u -r1.189 -r1.190 src/sys/kern/kern_lock.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.