Hi Everyone,
Maybe i have found the answer for this question. The author of the JBD
have explained in the comments:
/*
* When an ext3-ordered file is truncated, it is possible that many pages are
* not successfully freed, because they are attached to a committing
transaction.
* After the transaction commits, these pages are left on the LRU, with no
* ->mapping, and with attached buffers. These pages are trivially reclaimable
* by the VM, but their apparent absence upsets the VM accounting, and it makes
* the numbers in /proc/meminfo look odd.
...
*/
static void release_buffer_page(struct buffer_head *bh)
{
struct page *page;
...
But my new question is why not free those pages after the transaction commits?
--
Regards,
Lenky
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
