linux-ext4 - Re: Inactive memory keep growing and how to release it?

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Date:	Thu, 14 Mar 2013 16:00:28 +0800
From:	Lenky Gao <lenky.gao@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: Inactive memory keep growing and how to release it?

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
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