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 16:02:31 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Rik van Riel <riel@...hat.com>
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 Mon, Apr 16, 2012 at 10:53:07AM -0400, Rik van Riel wrote:
> 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.
> 

Indeed.

> >+ * 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" ?
> 

Yes.

-- 
Mel Gorman
SUSE Labs
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