diff -urN linux-2.4.29-wt2-2xx-lowlat/drivers/char/mem.c linux-2.4.29-wt2-2xx-lowlat-fix/drivers/char/mem.c
--- linux-2.4.29-wt2-2xx-lowlat/drivers/char/mem.c	Sun Mar  6 10:34:53 2005
+++ linux-2.4.29-wt2-2xx-lowlat-fix/drivers/char/mem.c	Sun Mar  6 10:36:50 2005
@@ -401,7 +401,7 @@
 		if (count > size)
 			count = size;
 
-		zap_page_range(mm, addr, count);
+		zap_page_range(mm, addr, count, 0);
         	zeromap_page_range(addr, count, vma->vm_page_prot);
 
 #if defined(CONFIG_PAX_SEGMEXEC) || defined(CONFIG_PAX_RANDEXEC)
@@ -413,7 +413,7 @@
 			vma_m = find_vma(mm, addr_m);
 			if (vma_m && vma_m->vm_start == addr_m && (vma_m->vm_flags & VM_MIRROR)) {
 				addr_m = addr + vma->vm_mirror;
-				zap_page_range(mm, addr_m, count);
+				zap_page_range(mm, addr_m, count, 0);
 			} else
 				printk(KERN_ERR "PAX: VMMIRROR: read_zero bug, %08lx, %08lx\n",
 				       addr, vma->vm_start);
diff -urN linux-2.4.29-wt2-2xx-lowlat/kernel/sysctl.c linux-2.4.29-wt2-2xx-lowlat-fix/kernel/sysctl.c
--- linux-2.4.29-wt2-2xx-lowlat/kernel/sysctl.c	Sun Mar  6 10:34:53 2005
+++ linux-2.4.29-wt2-2xx-lowlat-fix/kernel/sysctl.c	Sun Mar  6 10:36:21 2005
@@ -294,6 +294,11 @@
 	{KERN_PAX,"pax",NULL,0,0500,pax_table},
 #endif
 
+#ifdef CONFIG_LOLAT_SYSCTL
+	{KERN_LOWLATENCY, "lowlatency", &enable_lowlatency, sizeof (int),
+	0644, NULL, &proc_dointvec},
+#endif
+
 	{0}
 };
 
diff -urN linux-2.4.29-wt2-2xx-lowlat/mm/mmap.c linux-2.4.29-wt2-2xx-lowlat-fix/mm/mmap.c
--- linux-2.4.29-wt2-2xx-lowlat/mm/mmap.c	Sun Mar  6 10:34:53 2005
+++ linux-2.4.29-wt2-2xx-lowlat-fix/mm/mmap.c	Sun Mar  6 10:36:21 2005
@@ -1068,7 +1068,7 @@
 		atomic_dec(&file->f_dentry->d_inode->i_writecount);
 	}
 	remove_shared_vm_struct(mpnt);
-	zap_page_range(mm, st, size);
+	zap_page_range(mm, st, size, ZPR_COND_RESCHED);	/* sys_munmap() */
 
 	/*
 	 * Fix the mapping, and free the old area if it wasn't reused.