linux-kernel - Re: mapped pagecache pages vs unmapped pages

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Date:	Mon, 09 Apr 2012 21:11:14 +0400
From:	Alexey Ivanov <rbtz@...dex-team.ru>
To:	"gnehzuil.lzheng@...il.com" <gnehzuil.lzheng@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: mapped pagecache pages vs unmapped pages

Thanks for the hint!

Can anyone clarify the reason of not using zone->inactive_ratio in inactive_file_is_low_global()?

06.04.2012, 11:16, "gnehzuil.lzheng@...il.com" <gnehzuil.lzheng@...il.com>:
> On 04/06/2012 08:29 AM, Alexey Ivanov wrote:
>
>>  In progress of migration from FreeBSD to Linux and we found some strange behavior: periodically running tasks (like rsync/p2p deployment) evict mapped pages from memory.
>>
>>  From my little research I've found following lkml thread:
>>  https://lkml.org/lkml/2008/6/11/278
>>  And more precisely this commit: https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4f98a2fee8acdb4ac84545df98cccecfd130f8db
>>  which along with splitting LRU into "anon" and "file" removed support of reclaim_mapped.
>>
>>  Is there a knob to prioritize mapped memory over unmapped (without modifying all apps to use O_DIRECT/fadvise/madvise or mlocking our data in memory) or at least some way to change proportion of Active(file)/Inactive(file)?
>
> Hi Alexey,
>
> Cc to linux-mm mailing list.
>
> I have met the similar problem and I have sent a mail to discuss it.
> Maybe it can help you
> (http://marc.info/?l=linux-mm&m=132947026019538&w=2).
>
> Now Konstantin has sent a patch set to try to expand vm_flags from 32
> bit to 64 bit.  Then we can add the new flag into vm_flags and
> prioritize mmaped pages in madvise(2).
>
> Regards,
> Zheng
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