linux-kernel - Re: [PATCH v1 00/12] THP migration support

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Message-ID: <4F505AB2-9A71-4B89-8C93-83AB161A6DEA@sent.com>
Date:   Thu, 29 Sep 2016 22:32:36 -0400
From:   "Zi Yan" <zi.yan@...t.com>
To:     "Naoya Horiguchi" <n-horiguchi@...jp.nec.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v1 00/12] THP migration support

>
> Thanks for helping,

:)

>
> I think that you seem to do some testing with these patches on powerpc,
> which shows that thp migration can be enabled relatively easily for
> non-x86_64. This is a good news to me.

Right. I did some THP migration tests on both x86_64 and IBM ppc64.

You can use the code here to test the THP migration,
and compare the migration time between 512 base pages and 1 THP.
https://github.com/x-y-z/thp-migration-bench

NUMA (or fake NUMA) setup and libnuma are needed. Since it simply tries to
migrate pages from node 0 to node 1.

make bench should give you the result like:

THP Migration
Total time: 676.870346 us
Test successful.
-------------------
Base Page Migration
Total time: 2340.078354 us
Test successful.

>
> And I apology for my slow development over this patchset.
> My previous post was about 5 months ago, and I've not done ver.2 due to
> many interruptions. Someone also privately asked me about the progress
> of this work, so I promised ver.2 will be posted in a few weeks.
> Your patch 12/12 will come with it.

Looking forward to it. :)

—
Best Regards,
Yan Zi

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