linux-kernel - Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim

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Message-ID: <AANLkTimk6SwmljTWpIgp_OI_eLP6w8BCWKf-VRUFQ65H@mail.gmail.com>
Date:	Tue, 6 Jul 2010 14:46:37 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim

On Tue, Jul 6, 2010 at 9:36 AM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
> Hello,
>
>> Ok, that's reasonable as I'm still working on that patch. For example, the
>> patch disabled anonymous page writeback which is unnecessary as the stack
>> usage for anon writeback is less than file writeback.
>
> How do we examine swap-on-file?

bool is_swap_on_file(struct page *page)
{
    struct swap_info_struct *p;
    swp_entry_entry entry;
    entry.val = page_private(page);
    p = swap_info_get(entry);
    return !(p->flags & SWP_BLKDEV)
}

-- 
Kind regards,
Minchan Kim
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