CVS commit: [netbsd-8] src/sys/kern

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Sun Sep 23 17:46:16 UTC 2018

Modified Files:
        src/sys/kern [netbsd-8]: kern_synch.c

Log Message:
Pull up following revision(s) (requested by bouyer in ticket #1031):

        sys/kern/kern_synch.c: revision 1.317

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 -r1.311.10.1 -r1.311.10.2 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.