linux-kernel - Re: [PATCH -mm -v6 2/9] mm, memcg: Support to charge/uncharge multiple swap entries

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Date:   Wed, 08 Mar 2017 22:37:56 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vladimir Davydov <vdavydov@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>, Tejun Heo <tj@...nel.org>,
        cgroups@...r.kernel.org
Subject: Re: [PATCH -mm -v6 2/9] mm, memcg: Support to charge/uncharge
 multiple swap entries

On Wed, 2017-03-08 at 15:26 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@...el.com>
> 
> This patch make it possible to charge or uncharge a set of continuous
> swap entries in the swap cgroup.  The number of swap entries is
> specified via an added parameter.
> 
> This will be used for the THP (Transparent Huge Page) swap support.
> Where a swap cluster backing a THP may be allocated and freed as a
> whole.  So a set of (HPAGE_PMD_NR) continuous swap entries backing one
> THP need to be charged or uncharged together.  This will batch the
> cgroup operations for the THP swap too.

A quick look at the patches makes it look sane. I wonder if we would
make sense to track THP swapout separately as well
(from a memory.stat perspective)

Balbir Singh