the code for the /proc/benchmark/pagecache
Signed-Off-By: Dirk Gerdes <[email protected]>
---
--- linux-2.6-block_clean/block/pagecache.c 2005-12-01
12:24:30.000000000 +0100
+++ linux-2.6-block-pagecache-clean/block/pagecache.c 2005-11-30 17:14:40.000000000 +0100
@@ -0,0 +1,75 @@
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/uaccess.h>
+//#include <linux/pagecache.h>
+
+
+MODULE_LICENSE("GPL");
+
+extern int pagecache;
+
+
+static struct proc_dir_entry *benchmark_dir,
+ *pagecache_entry;
+
+
+
+
+
+
+static int pagecache_entry_read(char *buf, char **start,off_t offset,int size, int *eof, void *data)
+{
+ int bytes_written = 0;
+ if (pagecache)
+ bytes_written = snprintf(buf, size, "[on] off\n");
+ else
+ bytes_written = snprintf(buf, size, " on [off]\n");
+ return bytes_written;
+}
+
+static int pagecache_entry_write(struct file * instanz, const char __user *userbuffer, unsigned long count, void *data)
+{
+ char *kernel_buffer;
+ int not_copied;
+
+ kernel_buffer = kmalloc(count, GFP_KERNEL);
+ if (!kernel_buffer)
+ return -ENOMEM;
+ not_copied = copy_from_user(kernel_buffer, userbuffer, count);
+ if (strncmp (kernel_buffer,"on",2)==0){
+ pagecache=1;
+ }
+ else if (strncmp (kernel_buffer,"off",3)==0){
+ pagecache=0;
+ }
+
+ kfree(kernel_buffer);
+ return count-not_copied;
+}
+
+static int __init my_init(void)
+{
+
+
+ benchmark_dir = proc_mkdir("benchmark",NULL);
+ pagecache_entry = create_proc_entry("pagecache",S_IRUGO, benchmark_dir);
+ if (pagecache_entry){
+ pagecache_entry->read_proc = pagecache_entry_read;
+ pagecache_entry->write_proc = pagecache_entry_write;
+
+ pagecache_entry->data = NULL;
+ }
+
+ return 0;
+}
+static void __exit my_exit(void){
+ if (pagecache_entry) remove_proc_entry("pagecache",benchmark_dir);
+ if (benchmark_dir) remove_proc_entry("benchmark",NULL);
+}
+
+
+module_init(my_init);
+module_exit(my_exit);
+
-
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