From: Aaron Lu <aaron.lu@intel.com>
To: Xishi Qiu <qiuxishi@huawei.com>, Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: why the count nr_file_pages is not equal to nr_inactive_file + nr_active_file ?
Date: Fri, 13 May 2016 15:00:58 +0800 [thread overview]
Message-ID: <dce01643-7aa9-e779-e4ac-b74439f5074d@intel.com> (raw)
In-Reply-To: <573550D8.9030507@huawei.com>
On 05/13/2016 11:58 AM, 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.
>
> I think may be the pagevec trigger the problem, but PAGEVEC_SIZE is only 14.
> Does anyone know the reason?
One thing I can see is the ram backed filesystem where the page is
counted as NR_FILE_PAGE but go into the anonymous LRU list instead of
the file LRU list.
See function shmem_getpage_gfp.
An example:
[aaron@aaronlu ~]$ head -11 /proc/vmstat
nr_free_pages 194472
nr_alloc_batch 58
nr_inactive_anon 483386
nr_active_anon 298161
nr_inactive_file 452791
nr_active_file 1942376
nr_unevictable 84
nr_mlock 84
nr_anon_pages 445332
nr_mapped 93553
nr_file_pages 2731481
[aaron@aaronlu ~]$ fallocate -l 400M /dev/shm/test
[aaron@aaronlu ~]$ head -11 /proc/vmstat
nr_free_pages 94808
nr_alloc_batch 838
nr_inactive_anon 582385
nr_active_anon 298371
nr_inactive_file 452795
nr_active_file 1942380
nr_unevictable 84
nr_mlock 84
nr_anon_pages 445543
nr_mapped 93658
nr_file_pages 2830488
The nr_file_pages increased with nr_inactive_anon while the
nr_{in}active_file don't see much change.
Regards,
Aaron
>
> Thanks,
> Xishi Qiu
>
> root@hi3650:/ # 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
>
> --
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next prev parent reply other threads:[~2016-05-13 7:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-13 3:58 Xishi Qiu
2016-05-13 7:00 ` Aaron Lu [this message]
2016-05-13 7:31 ` Xishi Qiu
2016-05-16 9:57 ` Michal Hocko
2016-05-16 10:01 ` Xishi Qiu
2016-05-16 11:16 ` Michal Hocko
2016-05-16 9:31 ` Michal Hocko
2016-05-16 9:58 ` Xishi Qiu
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