CVS commit: src/sys/kern

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Tue Jul 24 15:09:37 UTC 2018

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

Log Message:
In mi_switch(), also call pserialize_switchpoint() if we're not switching
to another lwp, as proposed on
http://mail-index.netbsd.org/tech-kern/2018/07/20/msg023709.html

Without it, on a SMP machine with few processes running (e.g while
running sysinst), pserialize could hang for a long time until all
CPUs got a LWP to run (or, eventually, forever).
Tested on Xen domUs with 4 CPUs, and on a 64-threads AMD machine.


To generate a diff of this commit:
cvs rdiff -u -r1.316 -r1.317 src/sys/kern/kern_synch.c

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