linux-kernel - Re: [PATCH -mm -v7 0/9] THP swap: Delay splitting THP during swapping out

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Message-ID: <87shlwtqgz.fsf@yhuang-dev.intel.com>
Date:   Wed, 29 Mar 2017 16:52:12 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Huang\, Ying" <ying.huang@...el.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, Hugh Dickins <hughd@...gle.com>,
        Shaohua Li <shli@...nel.org>, Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>,
        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>
Subject: Re: [PATCH -mm -v7 0/9] THP swap: Delay splitting THP during swapping out

Hi, Andrew,

Andrew Morton <akpm@...ux-foundation.org> writes:

> On Tue, 28 Mar 2017 13:32:00 +0800 "Huang, Ying" <ying.huang@...el.com> wrote:
>
>> Hi, Andrew, could you help me to check whether the overall design is
>> reasonable?
>> 
>> Hi, Hugh, Shaohua, Minchan and Rik, could you help me to review the
>> swap part of the patchset?  Especially [1/9], [3/9], [4/9], [5/9],
>> [6/9], [9/9].
>> 
>> Hi, Andrea could you help me to review the THP part of the patchset?
>> Especially [2/9], [7/9] and [8/9].
>> 
>> Hi, Johannes, Michal and Vladimir, I am not very confident about the
>> memory cgroup part, especially [2/9].  Could you help me to review it?
>> 
>> And for all, Any comment is welcome!
>> 
>> 
>> Recently, the performance of the storage devices improved so fast that
>> we cannot saturate the disk bandwidth with single logical CPU when do
>> page swap out even on a high-end server machine.  Because the
>> performance of the storage device improved faster than that of single
>> logical CPU.  And it seems that the trend will not change in the near
>> future.  On the other hand, the THP becomes more and more popular
>> because of increased memory size.  So it becomes necessary to optimize
>> THP swap performance.
>
> I'll merge this patchset for testing purposes, but I don't believe that
> it has yet had sufficient review.  And thanks for drawing our attention
> to those parts where you believe close review is needed - that helps.

Thanks a lot for your help!  I believe the patchset will be better
tested in -mm tree.  And hope people will have time to review it more
closely.

Best Regards,
Huang, Ying