svn commit: r333051 - in head/sys: sys vm

[Mateusz Guzik]

Author: mjg
Date: Fri Apr 27 05:36:02 2018
New Revision: 333051
URL: https://svnweb.freebsd.org/changeset/base/333051

Log:
  vm: move vm_cnt to __read_mostly now that it is not written to
  
  While here whack unused locking keys for the struct.
  
  Discussed with:		jeff

Modified:
  head/sys/sys/vmmeter.h
  head/sys/vm/vm_meter.c

Modified: head/sys/sys/vmmeter.h
==============================================================================
--- head/sys/sys/vmmeter.h	Fri Apr 27 05:32:09 2018	(r333050)
+++ head/sys/sys/vmmeter.h	Fri Apr 27 05:36:02 2018	(r333051)
@@ -73,11 +73,8 @@ struct vmtotal {
 /*
  * System wide statistics counters.
  * Locking:
- *      a - locked by atomic operations
  *      c - constant after initialization
- *      f - locked by vm_page_queue_free_mtx
  *      p - uses counter(9)
- *      q - changes are synchronized by the corresponding vm_pagequeue lock
  */
 struct vmmeter {
 	/*

Modified: head/sys/vm/vm_meter.c
==============================================================================
--- head/sys/vm/vm_meter.c	Fri Apr 27 05:32:09 2018	(r333050)
+++ head/sys/vm/vm_meter.c	Fri Apr 27 05:36:02 2018	(r333051)
@@ -58,7 +58,7 @@ __FBSDID("$FreeBSD$");
 #include <vm/vm_object.h>
 #include <sys/sysctl.h>
 
-struct vmmeter __exclusive_cache_line vm_cnt = {
+struct vmmeter __read_mostly vm_cnt = {
 	.v_swtch = EARLY_COUNTER,
 	.v_trap = EARLY_COUNTER,
 	.v_syscall = EARLY_COUNTER,