linux-kernel - Re: [PATCH] [RFC] Throttle swappiness for interactive tasks

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Message-ID: <46264F91.4070106@redhat.com>
Date:	Wed, 18 Apr 2007 13:04:17 -0400
From:	Chris Snook <csnook@...hat.com>
To:	"अभिजित भोपटकर (Abhijit Bhopatkar)" <bainonline@...il.com>
CC:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>, akpm@...l.org,
	jgarzik@...ox.com
Subject: Re: [PATCH] [RFC] Throttle swappiness for interactive tasks

अभिजित भोपटकर (Abhijit Bhopatkar) wrote:
> The mm structures of interactive tasks are marked and
> the pages belonging to them are never shifted to inactive
> list in lru algorithm. Thus keeping interactive tasks in
> memory as long as possible.
> The interactivity is already determined by schedular so
> we reuse that knowledge to mark the mm structures.
> 
> Signed-off-by: Abhijit Bhopatkar <bainonline@...il.com>
> ---

Lying to the VM doesn't seem like the best way to handle this.  A lot of tasks, 
including interactive ones have some/many pages that they touch once during 
startup, and don't touch again for a very long time, if ever.  We want these 
pages swapped out long before the box swaps out the working set of our 
non-interactive processes.

I like the general idea of swap priority influenced by scheduler priority, but 
if we're going to do that, we should do it in a general way that's independent 
of scheduler implementation, so it'll be useful to soft real-time users and 
still relevant if (when?) we replace the current scheduler with something else 
lacking a special "interactive" flag.

	-- Chris
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