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

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Message-ID: <20180105184808.GS2801@dhcp22.suse.cz>
Date:   Fri, 5 Jan 2018 19:48:08 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Christopher Lameter <cl@...ux.com>
Cc:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        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 12:41:22, Cristopher Lameter wrote:
> On Fri, 5 Jan 2018, Michal Hocko wrote:
> 
> > I believe there should be some cap on the number of pages. We shouldn't
> > keep it held for million of pages if all of them are moved to the same
> > node. I would really like to postpone that to later unless it causes
> > some noticeable regressions because this would complicate the code
> > further and I am not sure this is all worth it.
> 
> Attached a patch to make the code more readable.
> 
> Also why are you migrating the pages on pagelist if a
> add_page_for_migration() fails? One could simply update
> the status in user space and continue.

I am open to further cleanups. Care to send a full patch with the
changelog? I would rather not fold more changes to the already tested
one.

Thanks!
-- 
Michal Hocko
SUSE Labs