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Message-ID: <1501000754.26846.18.camel@redhat.com>
Subject: Re: [PATCH -mm -v3 01/12] mm, THP, swap: Support to clear swap
 cache flag for THP swapped out
From: Rik van Riel <riel@redhat.com>
Date: Tue, 25 Jul 2017 12:39:14 -0400
In-Reply-To: <20170724051840.2309-2-ying.huang@intel.com>
References: <20170724051840.2309-1-ying.huang@intel.com>
	 <20170724051840.2309-2-ying.huang@intel.com>
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To: "Huang, Ying" <ying.huang@intel.com>, Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>, Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>, Shaohua Li <shli@kernel.org>


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On Mon, 2017-07-24 at 13:18 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@intel.com>
>=20
> Previously, swapcache_free_cluster() is used only in the error path
> of
> shrink_page_list() to free the swap cluster just allocated if the
> THP (Transparent Huge Page) is failed to be split.=C2=A0=C2=A0In this pat=
ch, it
> is enhanced to clear the swap cache flag (SWAP_HAS_CACHE) for the
> swap
> cluster that holds the contents of THP swapped out.
>=20
> This will be used in delaying splitting THP after swapping out
> support.=C2=A0=C2=A0Because there is no THP swapping in as a whole suppor=
t yet,
> after clearing the swap cache flag, the swap cluster backing the THP
> swapped out will be split.=C2=A0=C2=A0So that the swap slots in the swap
> cluster
> can be swapped in as normal pages later.
>=20
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Shaohua Li <shli@kernel.org>
> Cc: Rik van Riel <riel@redhat.com>
>=20

Acked-by: Rik van Riel <riel@redhat.com>

--=20
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