diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000..2676c09
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,2 @@
+((c-mode . ((indent-tabs-mode . nil)
+	    (c-basic-offset . 4))))
diff --git a/.gitignore b/.gitignore
index 8621919..5555472 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,5 @@ a.out
 *.log
 *.exe
 chytesting
+disk0
+*.orig
diff --git a/labcodes/lab1/.projectile b/labcodes/lab1/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab2/.projectile b/labcodes/lab2/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab3/.projectile b/labcodes/lab3/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab4/.projectile b/labcodes/lab4/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab5/.projectile b/labcodes/lab5/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab5/Makefile b/labcodes/lab5/Makefile
index d5ea58f..f416699 100644
--- a/labcodes/lab5/Makefile
+++ b/labcodes/lab5/Makefile
@@ -294,6 +294,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes/lab6/.projectile b/labcodes/lab6/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab6/Makefile b/labcodes/lab6/Makefile
index fe161c0..7f21bcf 100644
--- a/labcodes/lab6/Makefile
+++ b/labcodes/lab6/Makefile
@@ -294,6 +294,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes/lab6/kern/schedule/sched.h b/labcodes/lab6/kern/schedule/sched.h
index ca33799..766ac03 100644
--- a/labcodes/lab6/kern/schedule/sched.h
+++ b/labcodes/lab6/kern/schedule/sched.h
@@ -5,7 +5,7 @@
 #include <list.h>
 #include <skew_heap.h>
 
-#define MAX_TIME_SLICE 20
+#define MAX_TIME_SLICE 5
 
 struct proc_struct;
 
diff --git a/labcodes/lab6/user/priority.c b/labcodes/lab6/user/priority.c
index bcbc29d..6a1cae4 100644
--- a/labcodes/lab6/user/priority.c
+++ b/labcodes/lab6/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 unsigned int acc[TOTAL];
 int status[TOTAL];
 int pids[TOTAL];
diff --git a/labcodes/lab7/.projectile b/labcodes/lab7/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab7/Makefile b/labcodes/lab7/Makefile
index 613b097..b680479 100644
--- a/labcodes/lab7/Makefile
+++ b/labcodes/lab7/Makefile
@@ -294,6 +294,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes/lab7/kern/schedule/sched.c b/labcodes/lab7/kern/schedule/sched.c
index 8c3ff99..53c2e3c 100644
--- a/labcodes/lab7/kern/schedule/sched.c
+++ b/labcodes/lab7/kern/schedule/sched.c
@@ -49,7 +49,7 @@ sched_init(void) {
     sched_class = &default_sched_class;
 
     rq = &__rq;
-    rq->max_time_slice = 20;
+    rq->max_time_slice = 5;
     sched_class->init(rq);
 
     cprintf("sched class: %s\n", sched_class->name);
diff --git a/labcodes/lab7/kern/schedule/sched.h b/labcodes/lab7/kern/schedule/sched.h
index ca33799..766ac03 100644
--- a/labcodes/lab7/kern/schedule/sched.h
+++ b/labcodes/lab7/kern/schedule/sched.h
@@ -5,7 +5,7 @@
 #include <list.h>
 #include <skew_heap.h>
 
-#define MAX_TIME_SLICE 20
+#define MAX_TIME_SLICE 5
 
 struct proc_struct;
 
diff --git a/labcodes/lab7/user/priority.c b/labcodes/lab7/user/priority.c
index d71147e..d097270 100644
--- a/labcodes/lab7/user/priority.c
+++ b/labcodes/lab7/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 #define SLEEP_TIME 400
 unsigned int acc[TOTAL];
 int status[TOTAL];
@@ -39,7 +39,7 @@ main(void) {
                     spin_delay();
                     ++ acc[i];
                     if(acc[i]%4000==0) {
-                        if((time=gettime_msec())>MAX_TIME) {
+                        if((time=gettime_msec())>MAX_TIME+SLEEP_TIME) {
                             cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
                             exit(acc[i]);
                         }
diff --git a/labcodes/lab8/.projectile b/labcodes/lab8/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes/lab8/Makefile b/labcodes/lab8/Makefile
index d87f0a8..b2e287d 100644
--- a/labcodes/lab8/Makefile
+++ b/labcodes/lab8/Makefile
@@ -273,6 +273,9 @@ $(foreach p,$(USER_BINS),$(eval $(call fscopy,$(p),$(SFSROOT)$(SLASH))))
 $(SFSROOT):
 	if [ ! -d "$(SFSROOT)" ]; then mkdir $(SFSROOT); fi
 
+$(SFSROOT):
+	$(V)$(MKDIR) $@
+
 $(SFSIMG): $(SFSROOT) $(SFSBINS) | $(call totarget,mksfs)
 	$(V)dd if=/dev/zero of=$@ bs=1M count=128
 	@$(call totarget,mksfs) $@ $(SFSROOT)
@@ -340,6 +343,9 @@ run-%: build-%
 sh-%: script-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$*" 
 
diff --git a/labcodes/lab8/kern/schedule/sched.h b/labcodes/lab8/kern/schedule/sched.h
index ca33799..766ac03 100644
--- a/labcodes/lab8/kern/schedule/sched.h
+++ b/labcodes/lab8/kern/schedule/sched.h
@@ -5,7 +5,7 @@
 #include <list.h>
 #include <skew_heap.h>
 
-#define MAX_TIME_SLICE 20
+#define MAX_TIME_SLICE 5
 
 struct proc_struct;
 
diff --git a/labcodes/lab8/user/priority.c b/labcodes/lab8/user/priority.c
index d71147e..5624ec6 100644
--- a/labcodes/lab8/user/priority.c
+++ b/labcodes/lab8/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 #define SLEEP_TIME 400
 unsigned int acc[TOTAL];
 int status[TOTAL];
@@ -39,7 +39,7 @@ main(void) {
                     spin_delay();
                     ++ acc[i];
                     if(acc[i]%4000==0) {
-                        if((time=gettime_msec())>MAX_TIME) {
+                        if((time=gettime_msec())>SLEEP_TIME+MAX_TIME) {
                             cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
                             exit(acc[i]);
                         }
diff --git a/labcodes_answer/lab1_result/.projectile b/labcodes_answer/lab1_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab2_result/.projectile b/labcodes_answer/lab2_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab3_result/.projectile b/labcodes_answer/lab3_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab4_result/.projectile b/labcodes_answer/lab4_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab5_result/.projectile b/labcodes_answer/lab5_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab5_result/Makefile b/labcodes_answer/lab5_result/Makefile
index 2ec80da..3ebf64c 100644
--- a/labcodes_answer/lab5_result/Makefile
+++ b/labcodes_answer/lab5_result/Makefile
@@ -285,6 +285,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes_answer/lab6_result/.projectile b/labcodes_answer/lab6_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab6_result/Makefile b/labcodes_answer/lab6_result/Makefile
index ff4355c..4a2caf8 100644
--- a/labcodes_answer/lab6_result/Makefile
+++ b/labcodes_answer/lab6_result/Makefile
@@ -285,6 +285,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes_answer/lab6_result/kern/schedule/sched.h b/labcodes_answer/lab6_result/kern/schedule/sched.h
index ca33799..766ac03 100644
--- a/labcodes_answer/lab6_result/kern/schedule/sched.h
+++ b/labcodes_answer/lab6_result/kern/schedule/sched.h
@@ -5,7 +5,7 @@
 #include <list.h>
 #include <skew_heap.h>
 
-#define MAX_TIME_SLICE 20
+#define MAX_TIME_SLICE 5
 
 struct proc_struct;
 
diff --git a/labcodes_answer/lab6_result/user/priority.c b/labcodes_answer/lab6_result/user/priority.c
index bcbc29d..6a1cae4 100644
--- a/labcodes_answer/lab6_result/user/priority.c
+++ b/labcodes_answer/lab6_result/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 unsigned int acc[TOTAL];
 int status[TOTAL];
 int pids[TOTAL];
diff --git a/labcodes_answer/lab7_result/.projectile b/labcodes_answer/lab7_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab7_result/Makefile b/labcodes_answer/lab7_result/Makefile
index c5aa235..53da09a 100644
--- a/labcodes_answer/lab7_result/Makefile
+++ b/labcodes_answer/lab7_result/Makefile
@@ -285,6 +285,9 @@ MAKEOPTS	:= --quiet --no-print-directory
 run-%: build-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$* -DTESTSTART=$(RUN_PREFIX)$*_out_start -DTESTSIZE=$(RUN_PREFIX)$*_out_size"
 
diff --git a/labcodes_answer/lab7_result/kern/schedule/sched.c b/labcodes_answer/lab7_result/kern/schedule/sched.c
index e272635..c0dab33 100644
--- a/labcodes_answer/lab7_result/kern/schedule/sched.c
+++ b/labcodes_answer/lab7_result/kern/schedule/sched.c
@@ -48,7 +48,7 @@ sched_init(void) {
     sched_class = &default_sched_class;
 
     rq = &__rq;
-    rq->max_time_slice = 20;
+    rq->max_time_slice = 5;
     sched_class->init(rq);
 
     cprintf("sched class: %s\n", sched_class->name);
diff --git a/labcodes_answer/lab7_result/user/priority.c b/labcodes_answer/lab7_result/user/priority.c
index d71147e..d097270 100644
--- a/labcodes_answer/lab7_result/user/priority.c
+++ b/labcodes_answer/lab7_result/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 #define SLEEP_TIME 400
 unsigned int acc[TOTAL];
 int status[TOTAL];
@@ -39,7 +39,7 @@ main(void) {
                     spin_delay();
                     ++ acc[i];
                     if(acc[i]%4000==0) {
-                        if((time=gettime_msec())>MAX_TIME) {
+                        if((time=gettime_msec())>MAX_TIME+SLEEP_TIME) {
                             cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
                             exit(acc[i]);
                         }
diff --git a/labcodes_answer/lab8_result/.projectile b/labcodes_answer/lab8_result/.projectile
new file mode 100644
index 0000000..e69de29
diff --git a/labcodes_answer/lab8_result/Makefile b/labcodes_answer/lab8_result/Makefile
index 0f28ca1..1e3e279 100644
--- a/labcodes_answer/lab8_result/Makefile
+++ b/labcodes_answer/lab8_result/Makefile
@@ -261,6 +261,9 @@ endef
 
 $(foreach p,$(USER_BINS),$(eval $(call fscopy,$(p),$(SFSROOT)$(SLASH))))
 
+$(SFSROOT):
+	$(V)$(MKDIR) $@
+
 $(SFSIMG): $(SFSROOT) $(SFSBINS) | $(call totarget,mksfs)
 	$(V)dd if=/dev/zero of=$@ bs=1M count=128
 	@$(call totarget,mksfs) $@ $(SFSROOT)
@@ -332,6 +335,9 @@ run-%: build-%
 sh-%: script-%
 	$(V)$(QEMU) -parallel stdio $(QEMUOPTS) -serial null
 
+run-nox-%: build-%
+	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
+
 build-%: touch
 	$(V)$(MAKE) $(MAKEOPTS) "DEFS+=-DTEST=$*" 
 
diff --git a/labcodes_answer/lab8_result/kern/schedule/sched.c b/labcodes_answer/lab8_result/kern/schedule/sched.c
index e272635..c0dab33 100644
--- a/labcodes_answer/lab8_result/kern/schedule/sched.c
+++ b/labcodes_answer/lab8_result/kern/schedule/sched.c
@@ -48,7 +48,7 @@ sched_init(void) {
     sched_class = &default_sched_class;
 
     rq = &__rq;
-    rq->max_time_slice = 20;
+    rq->max_time_slice = 5;
     sched_class->init(rq);
 
     cprintf("sched class: %s\n", sched_class->name);
diff --git a/labcodes_answer/lab8_result/user/priority.c b/labcodes_answer/lab8_result/user/priority.c
index d71147e..5624ec6 100644
--- a/labcodes_answer/lab8_result/user/priority.c
+++ b/labcodes_answer/lab8_result/user/priority.c
@@ -5,7 +5,7 @@
 
 #define TOTAL 5
 /* to get enough accuracy, MAX_TIME (the running time of each process) should >1000 mseconds. */
-#define MAX_TIME  2000
+#define MAX_TIME  1000
 #define SLEEP_TIME 400
 unsigned int acc[TOTAL];
 int status[TOTAL];
@@ -39,7 +39,7 @@ main(void) {
                     spin_delay();
                     ++ acc[i];
                     if(acc[i]%4000==0) {
-                        if((time=gettime_msec())>MAX_TIME) {
+                        if((time=gettime_msec())>SLEEP_TIME+MAX_TIME) {
                             cprintf("child pid %d, acc %d, time %d\n",getpid(),acc[i],time);
                             exit(acc[i]);
                         }