svn commit: r309658 - head/sys/vm

[Mark Johnston]

Author: markj
Date: Tue Dec  6 22:52:45 2016
New Revision: 309658
URL: https://svnweb.freebsd.org/changeset/base/309658

Log:
  Provide dummy sysctls for v_cache_count and v_tcached.
  
  Some utilities (notably top(1)) exit if any of their input sysctls don't
  exist, and the removal of the above-mentioned PG_CACHE-related sysctls
  makes it difficult to run such utilities on different versions of the
  kernel without recompiling.
  
  Requested by:	bde

Modified:
  head/sys/vm/vm_meter.c

Modified: head/sys/vm/vm_meter.c
==============================================================================
--- head/sys/vm/vm_meter.c	Tue Dec  6 22:48:28 2016	(r309657)
+++ head/sys/vm/vm_meter.c	Tue Dec  6 22:52:45 2016	(r309658)
@@ -314,3 +314,14 @@ VM_STATS_VM(v_forkpages, "VM pages affec
 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
+
+#ifndef BURN_BRIDGES
+/*
+ * Provide compatibility sysctls for the benefit of old utilities which exit
+ * with an error if they cannot be found.
+ */
+SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
+    (u_int *)NULL, 0, "Dummy for compatibility");
+SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
+    (u_int *)NULL, 0, "Dummy for compatibility");
+#endif