Date: Sun, 7 Apr 2013 01:30:51 +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: r249221 - head/sys/vm Message-ID: <201304070130.r371UpUx050911@svn.freebsd.org>
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Author: alc Date: Sun Apr 7 01:30:51 2013 New Revision: 249221 URL: http://svnweb.freebsd.org/changeset/base/249221 Log: Micro-optimize the order of struct vm_radix_node's fields. Specifically, arrange for all of the fields to start at a short offset from the beginning of the structure. Eliminate unnecessary masking of VM_RADIX_FLAGS from the root pointer in vm_radix_getroot(). Sponsored by: EMC / Isilon Storage Division Modified: head/sys/vm/vm_radix.c Modified: head/sys/vm/vm_radix.c ============================================================================== --- head/sys/vm/vm_radix.c Sat Apr 6 22:30:46 2013 (r249220) +++ head/sys/vm/vm_radix.c Sun Apr 7 01:30:51 2013 (r249221) @@ -94,10 +94,10 @@ __FBSDID("$FreeBSD$"); ((vm_pindex_t)1 << ((VM_RADIX_LIMIT - (lev)) * VM_RADIX_WIDTH)) struct vm_radix_node { - void *rn_child[VM_RADIX_COUNT]; /* Child nodes. */ vm_pindex_t rn_owner; /* Owner of record. */ uint16_t rn_count; /* Valid children. */ uint16_t rn_clev; /* Current level. */ + void *rn_child[VM_RADIX_COUNT]; /* Child nodes. */ }; static uma_zone_t vm_radix_node_zone; @@ -175,7 +175,7 @@ static __inline struct vm_radix_node * vm_radix_getroot(struct vm_radix *rtree) { - return ((struct vm_radix_node *)(rtree->rt_root & ~VM_RADIX_FLAGS)); + return ((struct vm_radix_node *)rtree->rt_root); } /*
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