linux-kernel - Re: [RFC PATCH] s390: mm: rmap: Transfer storage key to struct page under the page lock

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Date:	Mon, 16 Apr 2012 10:53:07 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Hugh Dickins <hughd@...gle.com>, Linux-MM <linux-mm@...ck.org>,
	Linux-S390 <linux-s390@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] s390: mm: rmap: Transfer storage key to struct page
 under the page lock

On 04/16/2012 10:14 AM, Mel Gorman wrote:
> This patch is horribly ugly and there has to be a better way of doing
> it. I'm looking for suggestions on what s390 can do here that is not
> painful or broken.

I'm hoping the S390 arch maintainers have an idea.

Ugly or not, we'll need something to fix the bug.

> + * When the late PTE has gone, s390 must transfer the dirty flag from the
> + * storage key to struct page. We can usually skip this if the page is anon,
> + * so about to be freed; but perhaps not if it's in swapcache - there might
> + * be another pte slot containing the swap entry, but page not yet written to
> + * swap.
>    *
> - * The caller needs to hold the pte lock.
> + * set_page_dirty() is called while the page_mapcount is still postive and
> + * under the page lock to avoid races with the mapping being invalidated.
>    */
> -void page_remove_rmap(struct page *page)
> +static void propogate_storage_key(struct page *page, bool lock_required)

Do you mean "propAgate" ?

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