linux-kernel - Re: question related page frame reclaim on embedded system

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Date:	Wed, 3 Dec 2008 09:30:22 +0800 (CST)
From:	peter meng <mengsanshui@...oo.com.cn>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: question related page frame reclaim on embedded system


Hi,Kosaki

Thank you very much .
I have another question about share memory . Assume a process create a share memory , seems the page that the process used can not be discard or swap out when they are no longer used by any process or no swap space .

1.whether the maped page of the share memory is persistent in system until
  system restart ? if not how page frame reclaiming process it ? 


Thanks advanced 
Best Regards.
Peter Meng 

--- On Tue, 12/2/08, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Subject: Re: question related page frame reclaim on embedded system
> To: mengsanshui@...oo.com.cn
> Cc: kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org
> Date: Tuesday, December 2, 2008, 7:40 PM
> > 1, I have a question related page frame reclaim .
> > As i understood , under low memory pressure page frame
> reclaiming will
> > swap  Least Recently Used cache to disk .
> > So my question is assume no swap space ,how to works ?
> > Whether the  Least Recently Used  slab cache , inode
> cache  etc  will
> > be discard since no swap space .
> 
> Yes, page cache and slab cache (include inode cache and
> dentry cache) can be dropped
> although no swap.
> 
> 
> > 2. BTW ,I have already used my gmail account subscribe
> the linux kernel mail list .but can not post the question to
> mail list , i used plain text format . 
> > why ? I have seen many people use account of gmail  to
> post question .
> 
> I don't know.
> I can post by gmail.
> 
> But, One caution.
> gmail web interface is a bit silly. it can't post patch
> because
> it trim tab and space.


      
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