Re: [PATCH 2.6.9-rc2 1/2] enhanced I/O accounting data collection

[Jay Lan <jlan@xxxxxxxxxxxx>]

1/2: acct_io

Enhanced I/O accounting data collection.

Signed-off-by: Jay Lan <jlan@xxxxxxx>

Index: linux/drivers/block/ll_rw_blk.c
===================================================================
--- linux.orig/drivers/block/ll_rw_blk.c        2004-09-12 22:31:31.000000000 
-0700
+++ linux/drivers/block/ll_rw_blk.c     2004-09-27 12:37:04.374234677 -0700
@@ -1741,6 +1741,7 @@
 {
        DEFINE_WAIT(wait);
        struct request *rq;
+       unsigned long start_wait = jiffies;
 
        generic_unplug_device(q);
        do {
@@ -1769,6 +1770,7 @@
                finish_wait(&rl->wait[rw], &wait);
        } while (!rq);
 
+       current->bwtime += (unsigned long) jiffies - start_wait;
        return rq;
 }
 
Index: linux/fs/read_write.c
===================================================================
--- linux.orig/fs/read_write.c  2004-09-12 22:32:55.000000000 -0700
+++ linux/fs/read_write.c       2004-09-27 12:37:04.381070659 -0700
@@ -216,8 +216,11 @@
                                ret = file->f_op->read(file, buf, count, pos);
                        else
                                ret = do_sync_read(file, buf, count, pos);
-                       if (ret > 0)
+                       if (ret > 0) {
                                dnotify_parent(file->f_dentry, DN_ACCESS);
+                               current->rchar += ret;
+                       }
+                       current->syscr++;
                }
        }
 
@@ -260,8 +263,11 @@
                                ret = file->f_op->write(file, buf, count, pos);
                        else
                                ret = do_sync_write(file, buf, count, pos);
-                       if (ret > 0)
+                       if (ret > 0) {
                                dnotify_parent(file->f_dentry, DN_MODIFY);
+                               current->wchar += ret;
+                       }
+                       current->syscw++;
                }
        }
 
@@ -540,6 +546,10 @@
                fput_light(file, fput_needed);
        }
 
+       if (ret > 0) {
+               current->rchar += ret;
+       }
+       current->syscr++;
        return ret;
 }
 
@@ -558,6 +568,10 @@
                fput_light(file, fput_needed);
        }
 
+       if (ret > 0) {
+               current->wchar += ret;
+       }
+       current->syscw++;
        return ret;
 }
 
@@ -636,6 +650,13 @@
 
        retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, 
out_file);
 
+       if (retval > 0) {
+               current->rchar += retval;
+               current->wchar += retval;
+       }
+       current->syscr++;
+       current->syscw++;
+
        if (*ppos > max)
                retval = -EOVERFLOW;
 
Index: linux/include/linux/sched.h
===================================================================
--- linux.orig/include/linux/sched.h    2004-09-27 11:57:40.220967100 -0700
+++ linux/include/linux/sched.h 2004-09-27 12:52:51.305237393 -0700
@@ -591,6 +591,9 @@
        struct rw_semaphore pagg_sem;
 #endif
 
+/* i/o counters(bytes read/written, #syscalls, waittime */
+       unsigned long rchar, wchar, syscr, syscw, bwtime;
+
 };
 
 static inline pid_t process_group(struct task_struct *tsk)