[Lse-tech] [PATCH 2.6.9 1/2] enhanced accounting data collection

[Jay Lan <jlan@engr.sgi.com>]

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1/2: acct_io

Enahanced I/O accounting data collection.

Signed-off-by: Jay Lan <jlan@sgi.com>


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Index: linux/fs/read_write.c
===================================================================
--- linux.orig/fs/read_write.c	2004-09-29 20:05:18.000000000 -0700
+++ linux/fs/read_write.c	2004-10-01 17:09:42.711763439 -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	2004-10-01 17:01:21.412848229 -0700
+++ linux/include/linux/sched.h	2004-10-01 17:09:42.723482260 -0700
@@ -591,6 +591,9 @@
 	struct rw_semaphore pagg_sem;
 #endif
 
+/* i/o counters(bytes read/written, #syscalls */
+	unsigned long rchar, wchar, syscr, syscw;
+
 };
 
 static inline pid_t process_group(struct task_struct *tsk)
Index: linux/kernel/fork.c
===================================================================
--- linux.orig/kernel/fork.c	2004-10-01 17:01:21.432379595 -0700
+++ linux/kernel/fork.c	2004-10-01 17:09:42.732271376 -0700
@@ -995,6 +995,7 @@
 	p->real_timer.data = (unsigned long) p;
 
 	p->utime = p->stime = 0;
+	p->rchar = p->wchar = p->syscr = p->syscw = 0;
 	p->lock_depth = -1;		/* -1 = no lock */
 	p->start_time = get_jiffies_64();
 	p->security = NULL;