linux-kernel - Re: [PATCH 20/36] powerpc, thp: remove infrastructure for handling splitting PMDs

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Date:	Wed, 15 Jul 2015 17:01:57 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 20/36] powerpc, thp: remove infrastructure for handling splitting PMDs

"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> writes:

> With new refcounting we don't need to mark PMDs splitting. Let's drop
> code to handle this.
>
> pmdp_splitting_flush() is not needed too: on splitting PMD we will do
> pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as
> needed for fast_gup.
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

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