linux-kernel - Re: Accounting problem of MIGRATE

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Date:	Thu, 21 Jun 2012 13:22:37 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Aaditya Kumar <aaditya.kumar.30@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Accounting problem of MIGRATE_ISOLATED freed page

>
> Hm. I'm sorry if I couldn't chase the disucussion...Can I make summary ?
>
> As you shown, it seems to be not difficult to counting free pages under
> MIGRATE_ISOLATE.
> And we can know the zone contains MIGRATE_ISOLATE area or not by simple
> check.
> for example.
> ==
>                set_pageblock_migratetype(page, MIGRATE_ISOLATE);
>                move_freepages_block(zone, page, MIGRATE_ISOLATE);
>                zone->nr_isolated_areas++;
> =
>
> Then, the solution will be adding a function like following
> =
> u64 zone_nr_free_pages(struct zone *zone) {
>        unsigned long free_pages;
>
>        free_pages = zone_page_state(NR_FREE_PAGES);
>        if (unlikely(z->nr_isolated_areas)) {
>                isolated = count_migrate_isolated_pages(zone);
>                free_pages -= isolated;
>        }
>        return free_pages;
> }
> =
>
> Right ?

This represent my intention exactly. :)

> and... zone->all_unreclaimable is a different problem ?

Yes, all_unreclaimable derived livelock don't depend on memory hotplug.
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