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

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Date:	Mon, 16 May 2016 17:58:19 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Michal Hocko <mhocko@...nel.org>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	"Aaron Lu" <aaron.lu@...el.com>
Subject: Re: why the count nr_file_pages is not equal to nr_inactive_file
 + nr_active_file ?

On 2016/5/16 17:31, Michal Hocko wrote:

> On Fri 13-05-16 11:58:16, Xishi Qiu wrote:
>> 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.
> 
> Because they count shmem pages as well and those are living on the anon
> lru list (see shmem_add_to_page_cache).

Hi Michal,

But the shmem seems very small.

nr_inactive_file 432444
nr_active_file 20659
nr_unevictable 2363
nr_shmem 128

nr_file_pages 462723

There is still 7129 pages difference.

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_slab_reclaimable 259333
nr_slab_unreclaimable 33463
nr_page_table_pages 3456
nr_kernel_stack 892
nr_unstable 0
nr_bounce 11
nr_vmscan_write 292032
nr_vmscan_immediate_reclaim 47204474
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 128
nr_dirtied 69574
nr_written 356299
nr_anon_transparent_hugepages 0
nr_free_cma 7519
nr_swapcache 41972
nr_dirty_threshold 6982
nr_dirty_background_threshold 99297