linux-kernel - Re: [PATCH -mm -v4 00/21] mm, THP, swap: Swapout/swapin THP in one piece

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Date:   Thu, 28 Jun 2018 13:35:15 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>
Subject: Re: [PATCH -mm -v4 00/21] mm, THP, swap: Swapout/swapin THP in one piece

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

> On Thu, 28 Jun 2018 13:29:09 +0800 "Huang\, Ying" <ying.huang@...el.com> wrote:
>
>> Andrew Morton <akpm@...ux-foundation.org> writes:
>> 
>> > On Fri, 22 Jun 2018 11:51:30 +0800 "Huang, Ying" <ying.huang@...el.com> wrote:
>> >
>> >> This is the final step of THP (Transparent Huge Page) swap
>> >> optimization.  After the first and second step, the splitting huge
>> >> page is delayed from almost the first step of swapout to after swapout
>> >> has been finished.  In this step, we avoid splitting THP for swapout
>> >> and swapout/swapin the THP in one piece.
>> >
>> > It's a tremendously good performance improvement.  It's also a
>> > tremendously large patchset :(
>> >
>> > And it depends upon your
>> > mm-swap-fix-race-between-swapoff-and-some-swap-operations.patch and
>> > mm-fix-race-between-swapoff-and-mincore.patch, the first of which has
>> > been floating about since February without adequate review.
>> >
>> > I'll give this patchset a spin in -mm to see what happens and will come
>> > back later to take a closer look.  But the best I can do at this time
>> > is to hopefully cc some possible reviewers :)
>> 
>> Thanks a lot for your help!  Hope more people can review it!
>
> I took it out of -mm again, temporarily.  Due to a huge tangle with the
> xarray conversions in linux-next.

No problem.  I will rebase the patchset on your latest -mm tree, or the
next version to be released?

Best Regards,
Huang, Ying