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Provide dummy sysctls for v_cache_count and v_tcached.

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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
This commit is contained in:
Mark Johnston 2016-12-06 22:52:45 +00:00
parent 10c480e775
commit 77edd8fa00
1 changed files with 11 additions and 0 deletions
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11
sys/vm/vm_meter.c
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@ -314,3 +314,14 @@ VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 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