linux-kernel - Re: [PATCH -v3 03/10] mm, memcg: Support to charge/uncharge multiple swap entries

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Date:   Thu, 08 Sep 2016 13:58:36 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     tim.c.chen@...el.com, dave.hansen@...el.com, andi.kleen@...el.com,
        aaron.lu@...el.com, 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 -v3 03/10] mm, memcg: Support to charge/uncharge multiple
 swap entries

On 09/07/2016 10:16 PM, 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 continuous swap entries (512 on x86_64) backing one

Please use HPAGE_SIZE / PAGE_SIZE instead of hard coded number like 512.