From: mel@skynet.ie (Mel Gorman)
To: Dave Hansen <haveblue@us.ibm.com>
Cc: Badari Pulavarty <pbadari@us.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
melgor@ie.ibm.com, linux-mm <linux-mm@kvack.org>
Subject: Re: [PATCH 2/2] Add mem_type in /syfs to show memblock migrate type
Date: Fri, 26 Oct 2007 10:50:43 +0100 [thread overview]
Message-ID: <20071026095043.GA14347@skynet.ie> (raw)
In-Reply-To: <1193335935.24087.22.camel@localhost>
On (25/10/07 11:12), Dave Hansen didst pronounce:
> On Thu, 2007-10-25 at 19:05 +0100, Mel Gorman wrote:
> > I think Dave has a point so I would be happy with a boolean. We don't really
> > care what the type is, we care about if it can be removed or not.
> >
> > It also occurs to me from the "can we remove it perspective" that you may
> > also want to check if the pageblock is entirely free or not. You can encounter
> > a pageblock that is "Unmovable" but entirely free so it could be removed.
>
> The other option is to make it somewhat of a "removability score". If
> it has non-relocatable pages, then it gets a crappy score. If it is
> relocatable, give it more points. If it has more free pages, give it
> even more. If the pages contain images of puppies, take points away.
>
> That way, if something in userspace says, "we need to give memory back",
> it can go find the _best_ section from which to give it.
>
> But, maybe I'm just over-enginnering now. ;)
>
I think that's overkill, especially as any awkward page would give the
section a score of 0.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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next prev parent reply other threads:[~2007-10-26 9:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-25 15:55 [PATCH 2/2] Add mem_type in /syfs to show memblock migrate type Badari Pulavarty
2007-10-25 16:07 ` Mel Gorman
2007-10-25 16:52 ` Dave Hansen
2007-10-25 17:07 ` Badari Pulavarty
2007-10-25 17:15 ` Dave Hansen
2007-10-25 17:36 ` Badari Pulavarty
2007-10-25 17:34 ` Dave Hansen
2007-10-25 18:05 ` Mel Gorman
2007-10-25 18:12 ` Dave Hansen
2007-10-26 9:50 ` Mel Gorman [this message]
2007-10-26 15:52 ` Dave Hansen
2007-10-26 16:14 ` Mel Gorman
2007-10-26 17:18 ` Dave Hansen
-- strict thread matches above, loose matches on Subject: below --
2007-10-24 16:37 Badari Pulavarty
2007-10-25 10:17 ` Mel Gorman
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