diff -Naur orig/drivers/block/as-iosched.c edited/drivers/block/as-iosched.c
--- orig/drivers/block/as-iosched.c	2004-04-30 20:10:43.000000000 +0200
+++ edited/drivers/block/as-iosched.c	2004-05-01 00:02:59.000000000 +0200
@@ -65,7 +65,7 @@
  * or doing a lengthy computation. A small penalty can be justified there, and
  * will still catch out those processes that constantly have large thinktimes.
  */
-#define MAX_THINKTIME (HZ/50UL)
+unsigned long maxthinktime=(HZ/50UL);
 
 /* Bits in as_io_context.state */
 enum as_io_states {
@@ -869,7 +869,7 @@
 			if (test_bit(AS_TASK_IORUNNING, &aic->state)
 							&& in_flight == 0) {
 				thinktime = jiffies - aic->last_end_request;
-				thinktime = min(thinktime, MAX_THINKTIME-1);
+				thinktime = min(thinktime, maxthinktime-1);
 			} else
 				thinktime = 0;
 			as_update_thinktime(ad, aic, thinktime);
@@ -1951,6 +1951,7 @@
 {									\
 	return as_var_show(__VAR, (page));			\
 }
+SHOW_FUNCTION(as_maxthinktime_show, maxthinktime);
 SHOW_FUNCTION(as_readexpire_show, ad->fifo_expire[REQ_SYNC]);
 SHOW_FUNCTION(as_writeexpire_show, ad->fifo_expire[REQ_ASYNC]);
 SHOW_FUNCTION(as_anticexpire_show, ad->antic_expire);
@@ -1968,6 +1969,7 @@
 		*(__PTR) = (MAX);					\
 	return ret;							\
 }
+STORE_FUNCTION(as_maxthinktime_store, &maxthinktime, 0, LONG_MAX);
 STORE_FUNCTION(as_readexpire_store, &ad->fifo_expire[REQ_SYNC], 0, INT_MAX);
 STORE_FUNCTION(as_writeexpire_store, &ad->fifo_expire[REQ_ASYNC], 0, INT_MAX);
 STORE_FUNCTION(as_anticexpire_store, &ad->antic_expire, 0, INT_MAX);
@@ -1977,6 +1979,11 @@
 			&ad->batch_expire[REQ_ASYNC], 0, INT_MAX);
 #undef STORE_FUNCTION
 
+static struct as_fs_entry as_maxthinktime = {
+	.attr = {.name = "maxthinktime", .mode = S_IRUGO | S_IWUSR },
+	.show = as_maxthinktime_show,
+	.store = as_maxthinktime_store,
+};
 static struct as_fs_entry as_est_entry = {
 	.attr = {.name = "est_time", .mode = S_IRUGO },
 	.show = as_est_show,