More PMAP performance improvements: skip 256 MB segments entirely if they

are are not mapped during ranged operations and reduce the scope of the
tlbie lock only to the actual tlbie instruction instead of the entire
sequence. There are a few more optimization possibilities here as well.

1 files changed, 20 insertions, 4 deletions

diff --git a/sys/powerpc/aim/mmu_oea64.c b/sys/powerpc/aim/mmu_oea64.c
index 794f891..41361b7 100644
--- a/sys/powerpc/aim/mmu_oea64.c
+++ b/sys/powerpc/aim/mmu_oea64.c
@@ -1981,10 +1981,18 @@ moea64_protect(mmu_t mmu, pmap_t pm, vm_offset_t sva, vm_offset_t eva,
 	LOCK_TABLE_RD();
 	PMAP_LOCK(pm);
 	if ((eva - sva)/PAGE_SIZE < pm->pm_stats.resident_count) {
-		for (; sva < eva; sva += PAGE_SIZE) {
+		while (sva < eva) {
+			#ifdef __powerpc64__
+			if (pm != kernel_pmap &&
+			    user_va_to_slb_entry(pm, sva) == NULL) {
+				sva = roundup2(sva + 1, SEGMENT_LENGTH);
+				continue;
+			}
+			#endif
 			pvo = moea64_pvo_find_va(pm, sva);
 			if (pvo != NULL)
 				moea64_pvo_protect(mmu, pm, pvo, prot);
+			sva += PAGE_SIZE;
 		}
 	} else {
 		LIST_FOREACH_SAFE(pvo, &pm->pmap_pvo, pvo_plink, tpvo) {
@@ -2095,10 +2103,18 @@ moea64_remove(mmu_t mmu, pmap_t pm, vm_offset_t sva, vm_offset_t eva)
 	LOCK_TABLE_WR();
 	PMAP_LOCK(pm);
 	if ((eva - sva)/PAGE_SIZE < pm->pm_stats.resident_count) {
-		for (; sva < eva; sva += PAGE_SIZE) {
+		while (sva < eva) {
+			#ifdef __powerpc64__
+			if (pm != kernel_pmap &&
+			    user_va_to_slb_entry(pm, sva) == NULL) {
+				sva = roundup2(sva + 1, SEGMENT_LENGTH);
+				continue;
+			}
+			#endif
 			pvo = moea64_pvo_find_va(pm, sva);
 			if (pvo != NULL)
 				moea64_pvo_remove(mmu, pvo);
+			sva += PAGE_SIZE;
 		}
 	} else {
 		LIST_FOREACH_SAFE(pvo, &pm->pmap_pvo, pvo_plink, tpvo) {
@@ -2566,7 +2582,7 @@ moea64_mapdev_attr(mmu_t mmu, vm_offset_t pa, vm_size_t size, vm_memattr_t ma)
 
 	ppa = trunc_page(pa);
 	offset = pa & PAGE_MASK;
-	size = roundup(offset + size, PAGE_SIZE);
+	size = roundup2(offset + size, PAGE_SIZE);
 
 	va = kmem_alloc_nofault(kernel_map, size);
 
@@ -2597,7 +2613,7 @@ moea64_unmapdev(mmu_t mmu, vm_offset_t va, vm_size_t size)
 
 	base = trunc_page(va);
 	offset = va & PAGE_MASK;
-	size = roundup(offset + size, PAGE_SIZE);
+	size = roundup2(offset + size, PAGE_SIZE);
 
 	kmem_free(kernel_map, base, size);
 }