Author: mav
Date: Sun Apr 5 14:17:26 2015
New Revision: 281108
URL: https://svnweb.freebsd.org/changeset/base/281108
Log:
Add vmem locking to r281026.
While races there are not fatal, they cause result underestimation, that
cause unneeded ARC reclaims.
MFC after: 1 month
Modified:
head/sys/kern/subr_vmem.c
Modified: head/sys/kern/subr_vmem.c
==============================================================================
--- head/sys/kern/subr_vmem.c Sun Apr 5 14:06:11 2015 (r281107)
+++ head/sys/kern/subr_vmem.c Sun Apr 5 14:17:26 2015 (r281108)
@@ -1330,12 +1330,15 @@ vmem_size(vmem_t *vm, int typemask)
case VMEM_FREE|VMEM_ALLOC:
return vm->vm_size;
case VMEM_MAXFREE:
+ VMEM_LOCK(vm);
for (i = VMEM_MAXORDER - 1; i >= 0; i--) {
if (LIST_EMPTY(&vm->vm_freelist[i]))
continue;
+ VMEM_UNLOCK(vm);
return ((vmem_size_t)ORDER2SIZE(i) <<
vm->vm_quantum_shift);
}
+ VMEM_UNLOCK(vm);
return (0);
default:
panic("vmem_size");
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