linux-kernel - Re: [PATCH 1/3] mm, numa: rework do_pages

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Message-ID: <20180105091443.GJ2801@dhcp22.suse.cz>
Date:   Fri, 5 Jan 2018 10:14:43 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Reale <ar@...ux.vnet.ibm.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mm, numa: rework do_pages_move

On Fri 05-01-18 09:22:22, Anshuman Khandual wrote:
[...]
> Hi Michal,
> 
> After slightly modifying your test case (like fixing the page size for
> powerpc and just doing simple migration from node 0 to 8 instead of the
> interleaving), I tried to measure the migration speed with and without
> the patches on mainline. Its interesting....
> 
> 					10000 pages | 100000 pages
> 					--------------------------
> Mainline				165 ms		1674 ms
> Mainline + first patch (move_pages)	191 ms		1952 ms
> Mainline + all three patches		146 ms		1469 ms
> 
> Though overall it gives performance improvement, some how it slows
> down migration after the first patch. Will look into this further.

What are you measuring actually? All pages migrated to the same node?
Do you have any profiles? How stable are the results?

-- 
Michal Hocko
SUSE Labs