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Date: Mon, 17 Nov 2008 17:32:32 +0900
From: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
To: "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH] mm: evict streaming IO cache first
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
       "Rik van Riel" <riel@redhat.com>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
       "Gene Heskett" <gene.heskett@gmail.com>
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>> > How about resetting zone->recent_scanned/rotated to be some value calculated from
>> > INACTIVE_ANON/INACTIVE_FILE at some time (when the system is enough idle) ?
>>
>> in get_scan_ratio()
>>
> But active/inactive ratio (and mapped_ratio) is not handled there.

Yes.
I think akpm pointed out just this point.


> Follwoing 2 will return the same scan ratio.
> ==case 1==
>  active_anon = 480M
>  inactive_anon = 32M
>  active_file = 2M
>  inactive_file = 510M
>
> ==case 2==
>  active_anon = 480M
>  inactive_anon = 32M
>  active_file = 480M
>  inactive_file = 32M
> ==

Yes.
the patch handle this situation by special priority.


Umm..
Perhaps, I am missing your point?
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