--- orig/drivers/block/ll_rw_blk.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/drivers/block/ll_rw_blk.c	2003-04-02 12:34:23.000000000 -0700
@@ -1207,6 +1207,7 @@
 			kstat.pgpgin += count;
 			break;
 	}
+	conditional_schedule();
 }
 
 /**
--- orig/fs/buffer.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/fs/buffer.c	2003-04-02 12:34:23.000000000 -0700
@@ -255,12 +255,19 @@
 	struct buffer_head * next;
 	int nr;
 
-	next = lru_list[index];
 	nr = nr_buffers_type[index];
+repeat:
+	next = lru_list[index];
 	while (next && --nr >= 0) {
 		struct buffer_head *bh = next;
 		next = bh->b_next_free;
 
+		if (dev == NODEV && current->need_resched) {
+			spin_unlock(&lru_list_lock);
+			conditional_schedule();
+			spin_lock(&lru_list_lock);
+			goto repeat;
+		}
 		if (!buffer_locked(bh)) {
 			if (refile)
 				__refile_buffer(bh);
@@ -1117,8 +1124,10 @@
 	struct buffer_head * bh;
 
 	bh = getblk(dev, block, size);
-	if (buffer_uptodate(bh))
+	if (buffer_uptodate(bh)) {
+		conditional_schedule();
 		return bh;
+	}
 	ll_rw_block(READ, 1, &bh);
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
--- orig/fs/dcache.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/fs/dcache.c	2003-04-02 12:34:23.000000000 -0700
@@ -71,7 +71,7 @@
  * d_iput() operation if defined.
  * Called with dcache_lock held, drops it.
  */
-static inline void dentry_iput(struct dentry * dentry)
+static void dentry_iput(struct dentry * dentry)
 {
 	struct inode *inode = dentry->d_inode;
 	if (inode) {
@@ -84,6 +84,7 @@
 			iput(inode);
 	} else
 		spin_unlock(&dcache_lock);
+	conditional_schedule();
 }
 
 /* 
--- orig/fs/jbd/commit.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/fs/jbd/commit.c	2003-04-02 12:34:23.000000000 -0700
@@ -212,6 +212,16 @@
 				__journal_remove_journal_head(bh);
 				refile_buffer(bh);
 				__brelse(bh);
+				if (current->need_resched) {
+					if (commit_transaction->t_sync_datalist)
+						commit_transaction->t_sync_datalist =
+							next_jh;
+					if (bufs)
+						break;
+					spin_unlock(&journal_datalist_lock);
+					conditional_schedule();
+					goto write_out_data;
+				}
 			}
 		}
 		if (bufs == ARRAY_SIZE(wbuf)) {
--- orig/fs/proc/array.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/fs/proc/array.c	2003-04-02 12:34:23.000000000 -0700
@@ -418,6 +418,8 @@
 		pte_t page = *pte;
 		struct page *ptpage;
 
+		conditional_schedule();
+
 		address += PAGE_SIZE;
 		pte++;
 		if (pte_none(page))
--- orig/fs/proc/generic.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/fs/proc/generic.c	2003-04-02 12:34:23.000000000 -0700
@@ -98,7 +98,9 @@
 				retval = n;
 			break;
 		}
-		
+
+		conditional_schedule();
+
 		/* This is a hack to allow mangling of file pos independent
  		 * of actual bytes read.  Simply place the data at page,
  		 * return the bytes, and set `start' to the desired offset
--- orig/include/linux/condsched.h	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/include/linux/condsched.h	2003-04-02 12:34:23.000000000 -0700
@@ -0,0 +1,18 @@
+#ifndef _LINUX_CONDSCHED_H
+#define _LINUX_CONDSCHED_H
+
+#ifndef __LINUX_COMPILER_H
+#include <linux/compiler.h>
+#endif
+
+#ifndef __ASSEMBLY__
+#define conditional_schedule()				\
+do {							\
+	if (unlikely(current->need_resched)) {		\
+		__set_current_state(TASK_RUNNING);	\
+		schedule();				\
+	}						\
+} while(0)
+#endif
+
+#endif
--- orig/include/linux/sched.h	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/include/linux/sched.h	2003-04-02 12:34:23.000000000 -0700
@@ -13,6 +13,7 @@
 #include <linux/times.h>
 #include <linux/timex.h>
 #include <linux/rbtree.h>
+#include <linux/condsched.h>
 
 #include <asm/system.h>
 #include <asm/semaphore.h>
--- orig/mm/filemap.c	2003-04-02 12:34:23.000000000 -0700
+++ linux-2.4.20/mm/filemap.c	2003-04-02 12:34:23.000000000 -0700
@@ -302,10 +302,7 @@
 
 			page_cache_release(page);
 
-			if (current->need_resched) {
-				__set_current_state(TASK_RUNNING);
-				schedule();
-			}
+			conditional_schedule();
 
 			spin_lock(&pagecache_lock);
 			goto restart;
@@ -584,6 +581,7 @@
 			UnlockPage(page);
 
 		page_cache_release(page);
+		conditional_schedule();
 		spin_lock(&pagecache_lock);
 	}
 	spin_unlock(&pagecache_lock);
@@ -1450,6 +1448,9 @@
 		offset &= ~PAGE_CACHE_MASK;
 
 		page_cache_release(page);
+
+		conditional_schedule();
+
 		if (ret == nr && desc->count)
 			continue;
 		break;
@@ -3138,6 +3139,8 @@
 		UnlockPage(page);
 		page_cache_release(page);
 
+		conditional_schedule();
+
 		if (status < 0)
 			break;
 	} while (count);