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From: Rik van Riel <>
To: Nikita Danilov <>
Cc: Linux Kernel Mailing List <>,
	linux-mm <>
Subject: Re: [RFC][PATCH] split file and anonymous page queues #3
Date: Wed, 21 Mar 2007 08:01:19 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <17921.7074.900919.784218@gargle.gargle.HOWL>

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()...

Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is.  Each group
calls the other unpatriotic.

  reply	other threads:[~2007-03-21 12:01 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 [this message]
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
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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