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From: Chuck Ebbert <>
To: Rik van Riel <>
Cc: Nikita Danilov <>,
	Linux Kernel Mailing List <>,
	linux-mm <>
Subject: Re: [RFC][PATCH] split file and anonymous page queues #3
Date: Wed, 21 Mar 2007 12:12:58 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Rik van Riel wrote:
> Nikita Danilov wrote:
>> Probably I am missing something, but I don't see how that can help. For
>> example, suppose (for simplicity) that we have swappiness of 100%, and
>> that fraction of referenced anon pages gets slightly less than of file
>> pages. get_scan_ratio() increases anon_percent, and shrink_zone() starts
>> scanning anon queue more aggressively. As a result, pages spend less
>> time there, and have less chance of ever being accessed, reducing
>> fraction of referenced anon pages further, and triggering further
>> increase in the amount of scanning, etc. Doesn't this introduce positive
>> feed-back loop?
> It's a possibility, but I don't think it will be much of an
> issue in practice.
> If it is, we can always use refaults as a correcting
> mechanism - which would have the added benefit of being
> able to do streaming IO without putting any pressure on
> the active list, essentially clock-pro replacement with
> just some tweaks to shrink_list()...

I think you're going to have to use refault rates. AIX 3.5 had
to add that. Something like:

if refault_rate(anonymous/mmap) > refault_rate(pagecache)
   drop a pagecache page
   drop either

You do have anonymous memory and mmapped executables in the same
queue, right?

  parent reply	other threads:[~2007-03-21 16:13 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-20 22:08 Rik van Riel
2007-03-21  1:07 ` Matt Mackall
2007-03-21 19:11   ` Rik van Riel
2007-03-21  8:44 ` Nikita Danilov
2007-03-21 11:24   ` Rik van Riel
2007-03-21 11:48     ` Nikita Danilov
2007-03-21 12:01       ` Rik van Riel
2007-03-21 12:03         ` Rik van Riel
2007-03-21 15:29           ` Nikita Danilov
2007-03-21 16:08             ` Rik van Riel
2007-03-21 22:18               ` Nikita Danilov
2007-03-21 16:12         ` Chuck Ebbert [this message]
2007-03-21 16:56           ` Rik van Riel
  -- strict thread matches above, loose matches on Subject: below --
2007-03-20 22:06 Rik van Riel

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