diff -uBbr -X linux-2.6.13-rc3-mm1/Documentation/dontdiff linux-2.6.13-rc3-mm1/drivers/block/ll_rw_blk.c linux-2.6.13-rc3-mm1-ahu/drivers/block/ll_rw_blk.c
--- linux-2.6.13-rc3-mm1/drivers/block/ll_rw_blk.c	2005-07-19 09:06:26.000000000 -0400
+++ linux-2.6.13-rc3-mm1-ahu/drivers/block/ll_rw_blk.c	2005-07-21 20:40:22.000000000 -0400
@@ -2879,6 +2879,9 @@
 	set_bit(BIO_EOF, &bio->bi_flags);
 }
 
+#include <linux/relayfs_fs.h>
+extern struct rchan *diskstat_chan;
+
 /**
  * generic_make_request: hand a buffer to its device driver for I/O
  * @bio:  The bio describing the location in memory and on the device.
@@ -2968,6 +2971,26 @@
 		 */
 		blk_partition_remap(bio);
 
+		if(diskstat_chan)
+		{
+			char b[BDEVNAME_SIZE];
+			char buf[128];
+			struct timeval tv;
+			do_gettimeofday(&tv);
+			int size = snprintf(buf, sizeof(buf)-1, "start: %ld %ld %p %p %s(%d): %s block %Lu - %Lu (%d) on %s %ld %ld\n",
+					    tv.tv_sec, tv.tv_usec,
+					    bio, bio->bi_end_io, 
+					    current->comm, current->pid,
+					    (bio->bi_rw & WRITE) ? "WRITE" : "READ",
+					    (unsigned long long)bio->bi_sector,
+					    (unsigned long long)bio->bi_sector + bio->bi_size / 512,
+					    bio->bi_size, 
+					    bdevname(bio->bi_bdev,b),
+					    nr_running(), nr_iowait());
+			relay_write(diskstat_chan, buf, size);
+
+		}
+
 		ret = q->make_request_fn(q, bio);
 	} while (ret);
 }
diff -uBbr -X linux-2.6.13-rc3-mm1/Documentation/dontdiff linux-2.6.13-rc3-mm1/fs/bio.c linux-2.6.13-rc3-mm1-ahu/fs/bio.c
--- linux-2.6.13-rc3-mm1/fs/bio.c	2005-07-19 09:06:26.000000000 -0400
+++ linux-2.6.13-rc3-mm1-ahu/fs/bio.c	2005-07-21 17:29:43.000000000 -0400
@@ -962,6 +962,10 @@
 	}
 }
 
+#include <linux/relayfs_fs.h>
+extern struct rchan *diskstat_chan;
+
+
 /**
  * bio_endio - end I/O on a bio
  * @bio:	bio
@@ -988,6 +992,24 @@
 		bytes_done = bio->bi_size;
 	}
 
+	if (diskstat_chan) {
+		char buf[256];
+		char b[BDEVNAME_SIZE];
+		
+		struct timeval tv;
+		do_gettimeofday(&tv);
+		int size = snprintf(buf, sizeof(buf)-1, "end: %ld %ld %p %s %Lu - %Lu (%d) on %s\n",
+				    tv.tv_sec, tv.tv_usec,
+				    bio, 
+				    (bio->bi_rw & WRITE) ? "WRITE" : "READ",
+				    (unsigned long long)bio->bi_sector,
+				    (unsigned long long)bio->bi_sector + bytes_done / 512,
+				    bytes_done, 
+				    bdevname(bio->bi_bdev, b));
+
+		relay_write(diskstat_chan, buf, size);
+	}
+
 	bio->bi_size -= bytes_done;
 	bio->bi_sector += (bytes_done >> 9);
 
diff -uBbr -X linux-2.6.13-rc3-mm1/Documentation/dontdiff linux-2.6.13-rc3-mm1/fs/open.c linux-2.6.13-rc3-mm1-ahu/fs/open.c
--- linux-2.6.13-rc3-mm1/fs/open.c	2005-07-19 09:06:26.000000000 -0400
+++ linux-2.6.13-rc3-mm1-ahu/fs/open.c	2005-07-21 17:29:17.000000000 -0400
@@ -938,6 +938,9 @@
 
 EXPORT_SYMBOL(fd_install);
 
+#include <linux/relayfs_fs.h>
+extern struct rchan *diskstat_chan;
+
 asmlinkage long sys_open(const char __user * filename, int flags, int mode)
 {
 	char * tmp;
@@ -962,6 +965,18 @@
 		}
 		putname(tmp);
 	}
+
+	if( fd >= 0 && diskstat_chan) {
+		char buf[456];
+		struct timeval tv;
+		do_gettimeofday(&tv);
+		int size = snprintf(buf, sizeof(buf)-1, "open: %ld %ld %d %s\n", 
+				    tv.tv_sec, tv.tv_usec,
+				    current->pid,  filename);
+
+		relay_write(diskstat_chan, buf, size);
+	}
+
 	return fd;
 }
 EXPORT_SYMBOL_GPL(sys_open);
diff -uBbr -X linux-2.6.13-rc3-mm1/Documentation/dontdiff linux-2.6.13-rc3-mm1/init/main.c linux-2.6.13-rc3-mm1-ahu/init/main.c
--- linux-2.6.13-rc3-mm1/init/main.c	2005-07-19 09:06:26.000000000 -0400
+++ linux-2.6.13-rc3-mm1-ahu/init/main.c	2005-07-19 09:22:36.000000000 -0400
@@ -584,6 +584,11 @@
 	flush_scheduled_work();
 }
 
+#include <linux/relayfs_fs.h>
+#define SUBBUF_SIZE 10000000
+#define N_SUBBUFS 1
+struct rchan *diskstat_chan = NULL;
+
 /*
  * Ok, the machine is now initialized. None of the devices
  * have been touched yet, but the CPU subsystem is up and
@@ -606,6 +611,12 @@
 	sock_init();
 
 	do_initcalls();
+	diskstat_chan = relay_open("diskstat", NULL, SUBBUF_SIZE,
+				  N_SUBBUFS, 1, NULL);
+	if (!diskstat_chan)
+		printk("diskchat channel creation failed\n");
+	else
+		printk("diskchat channel ready\n");
 }
 
 static void do_pre_smp_initcalls(void)