Date: Fri, 23 May 2014 16:22:37 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r266588 - head/sys/vm Message-ID: <201405231622.s4NGMbNg024234@svn.freebsd.org>
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Author: alc Date: Fri May 23 16:22:36 2014 New Revision: 266588 URL: http://svnweb.freebsd.org/changeset/base/266588 Log: There is no reason to perform the pmap_remove() on the kernel pmap while the kmem object lock is held. Do the pmap_remove() before acquiring the kmem object lock. MFC after: 1 week Sponsored by: EMC / Isilon Storage Division Modified: head/sys/vm/vm_kern.c Modified: head/sys/vm/vm_kern.c ============================================================================== --- head/sys/vm/vm_kern.c Fri May 23 14:34:22 2014 (r266587) +++ head/sys/vm/vm_kern.c Fri May 23 16:22:36 2014 (r266588) @@ -396,9 +396,9 @@ kmem_unback(vm_object_t object, vm_offse KASSERT(object == kmem_object || object == kernel_object, ("kmem_unback: only supports kernel objects.")); + pmap_remove(kernel_pmap, addr, addr + size); offset = addr - VM_MIN_KERNEL_ADDRESS; VM_OBJECT_WLOCK(object); - pmap_remove(kernel_pmap, addr, addr + size); for (i = 0; i < size; i += PAGE_SIZE) { m = vm_page_lookup(object, OFF_TO_IDX(offset + i)); vm_page_unwire(m, 0);
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