fixes

kernel-src/arch/x86-64/context.asm

@@ -4,7 +4,7 @@ arch_context_switch:
 	xor rsi, rsi ; is syscall? (no)
 	extern sched_userspacecheck
 	call sched_userspacecheck ; compiled with no_caller_saved_registers
-
+	cli
 	; rdi is the pointer to the context struct
 	mov rsp, rdi
 

kernel-src/arch/x86-64/syscall.asm

@@ -240,6 +240,7 @@ arch_syscall_entry:
 	mov rcx, rax ; return value
 	extern sched_userspacecheck ; context, return, errno
 	call sched_userspacecheck ; compiled with __attribute__((no_caller_saved_registers))
+	cli
 
 	; restore context
 	add rsp, 32 ; r9 argument, cr2, gs, and fs are not popped.

kernel-src/mm/vmmcache.c

@@ -262,7 +262,7 @@ int vmmcache_syncvnode(vnode_t *vnode, uintmax_t offset, size_t size) {
 	page_t *page = vnode->pages;
 	page_t *vnodedirtylist = NULL;
 	for (; page; page = page->vnodenext) {
-		if (page->offset < offset || page->offset >= top)
+		if (page->offset < offset || page->offset >= top || (page->offset & PAGE_FLAGS_DIRTY) == 0)
 			continue;
 
 		// remove from write list and add to an internal list using the write pointers
@@ -391,7 +391,7 @@ void vmmcache_init() {
 	memset(table, 0, TABLE_SIZE * sizeof(page_t *));
 
 	SEMAPHORE_INIT(&sync, 0);
-	writerthread = sched_newthread(writer, PAGE_SIZE * 4, 1, NULL, NULL);
+	writerthread = sched_newthread(writer, PAGE_SIZE * 16, 1, NULL, NULL);
 	__assert(writerthread);
 	sched_queue(writerthread);
 	vmmcache_sync();