From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Huang, Ying" <ying.huang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -mm -v10 3/3] mm, THP, swap: Enable THP swap optimization only if has compound map
Date: Fri, 28 Apr 2017 16:16:28 +0300 [thread overview]
Message-ID: <20170428131628.vsiapdgm7e6yddsb@node.shutemov.name> (raw)
In-Reply-To: <20170425214618.GB6841@cmpxchg.org>
On Tue, Apr 25, 2017 at 05:46:18PM -0400, Johannes Weiner wrote:
> On Tue, Apr 25, 2017 at 08:56:58PM +0800, Huang, Ying wrote:
> > From: Huang Ying <ying.huang@intel.com>
> >
> > If there is no compound map for a THP (Transparent Huge Page), it is
> > possible that the map count of some sub-pages of the THP is 0. So it
> > is better to split the THP before swapping out. In this way, the
> > sub-pages not mapped will be freed, and we can avoid the unnecessary
> > swap out operations for these sub-pages.
> >
> > Cc: Johannes Weiner <hannes@cmpxchg.org>
> > Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
>
> Acked-by: Johannes Weiner <hannes@cmpxchg.org>
>
> CC Kirill to double check the reasoning here
Looks good to me:
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
--
Kirill A. Shutemov
prev parent reply other threads:[~2017-04-28 13:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-25 12:56 [PATCH -mm -v10 0/3] THP swap: Delay splitting THP during swapping out Huang, Ying
2017-04-25 12:56 ` [PATCH -mm -v10 1/3] mm, THP, swap: Delay splitting THP during swap out Huang, Ying
2017-04-27 5:31 ` Minchan Kim
2017-04-27 7:12 ` Huang, Ying
2017-04-27 13:37 ` Johannes Weiner
2017-04-28 8:40 ` Minchan Kim
2017-04-28 12:21 ` Huang, Ying
2017-05-10 1:03 ` Minchan Kim
2017-05-01 10:44 ` Johannes Weiner
2017-05-01 23:53 ` Minchan Kim
2017-05-10 13:56 ` Johannes Weiner
2017-05-10 23:25 ` Minchan Kim
2017-05-11 0:50 ` Huang, Ying
2017-05-11 4:31 ` Minchan Kim
2017-05-12 2:21 ` [PATCH 1/2] mm: swap: unify swap slot free functions to put_swap_page Minchan Kim
2017-05-12 2:21 ` [PATCH 2/2] mm: swap: move anonymous THP split logic to vmscan Minchan Kim
2017-05-12 16:48 ` Johannes Weiner
2017-05-12 16:47 ` [PATCH 1/2] mm: swap: unify swap slot free functions to put_swap_page Johannes Weiner
2017-05-11 1:22 ` [PATCH -mm -v10 1/3] mm, THP, swap: Delay splitting THP during swap out Minchan Kim
2017-05-11 10:40 ` Johannes Weiner
2017-05-12 1:34 ` Minchan Kim
2017-04-25 12:56 ` [PATCH -mm -v10 2/3] mm, THP, swap: Check whether THP can be split firstly Huang, Ying
2017-04-25 21:43 ` Johannes Weiner
2017-04-25 12:56 ` [PATCH -mm -v10 3/3] mm, THP, swap: Enable THP swap optimization only if has compound map Huang, Ying
2017-04-25 21:46 ` Johannes Weiner
2017-04-28 13:16 ` Kirill A. Shutemov [this message]
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