Module Name: src
Committed By: ad
Date: Fri Jan 17 20:26:22 UTC 2020
Modified Files:
src/sys/kern: kern_lock.c
Log Message:
kernel_lock:
- Defer setting ci_biglock_wanted for a bit, because if curlwp holds a mutex
or rwlock, and otherlwp is spinning waiting for the mutex/rwlock, setting
ci_biglock_wanted causes otherlwp to block to avoid deadlock. If the spin
on kernel_lock is short there's no point causing trouble.
- Do exponential backoff.
- Put the spinout check under LOCKDEBUG to match the others.
To generate a diff of this commit:
cvs rdiff -u -r1.164 -r1.165 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.
