CVS commit: src/sys

["Andrew Doran" <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Sun Jan  5 20:26:56 UTC 2020

Modified Files:
        src/sys/kern: kern_runq.c
        src/sys/sys: sched.h

Log Message:
- Another tweak for SMT: if a new LWP is starting life, try to make it run
  on a different CPU in the same CPU core as the parent, because both parent
  and child share lots of state.  (I want to come back later and do
  something different for _lwp_create() and maybe execve().)

- Remove the runqueue evcnts, which are racy and impose a penalty for very
  little payoff.

- Break out of the loop in sched_takecpu() as soon as we have a CPU that can
  run the LWP.  There's no need to look at all CPUs.

- SPCF_IDLE in sched_enqueue() so we know the CPU is not idle sooner.


To generate a diff of this commit:
cvs rdiff -u -r1.54 -r1.55 src/sys/kern/kern_runq.c
cvs rdiff -u -r1.82 -r1.83 src/sys/sys/sched.h

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