From: Dave Hansen <haveblue@us.ibm.com>
To: Mel Gorman <mel@skynet.ie>
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: Thu, 25 Oct 2007 11:12:15 -0700 [thread overview]
Message-ID: <1193335935.24087.22.camel@localhost> (raw)
In-Reply-To: <20071025180514.GB20345@skynet.ie>
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. ;)
-- Dave
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next prev parent reply other threads:[~2007-10-25 18:12 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 [this message]
2007-10-26 9:50 ` Mel Gorman
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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