linux-kernel - why the count nr_file_pages is not equal to nr_inactive_file + nr_active

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Message-ID: <573550D8.9030507@huawei.com>
Date:	Fri, 13 May 2016 11:58:16 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: why the count nr_file_pages is not equal to nr_inactive_file + nr_active_file
 ?

I find the count nr_file_pages is not equal to nr_inactive_file + nr_active_file.
There are 8 cpus, 2 zones in my system.

I think may be the pagevec trigger the problem, but PAGEVEC_SIZE is only 14.
Does anyone know the reason?

Thanks,
Xishi Qiu

root@...650:/ # cat /proc/vmstat 
nr_free_pages 54192
nr_inactive_anon 39830
nr_active_anon 28794
nr_inactive_file 432444
nr_active_file 20659
nr_unevictable 2363
nr_mlock 0
nr_anon_pages 65249
nr_mapped 19742
nr_file_pages 462723
nr_dirty 20
nr_writeback 0
...

nr_inactive_file 432444
nr_active_file 20659
total is 453103

nr_file_pages 462723