linux-kernel - Re: [PATCH 06/14] mm, migrate: Immediately fail migration of a page with no migration handler

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Message-ID: <20181220203127.GB31517@techsingularity.net>
Date:   Thu, 20 Dec 2018 20:31:27 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Yang Shi <shy828301@...il.com>
Cc:     Linux MM <linux-mm@...ck.org>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        torvalds@...ux-foundation.org, Michal Hocko <mhocko@...nel.org>,
        Huang Ying <ying.huang@...el.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] mm, migrate: Immediately fail migration of a page
 with no migration handler

On Thu, Dec 20, 2018 at 11:44:57AM -0800, Yang Shi wrote:
> On Fri, Dec 14, 2018 at 3:03 PM Mel Gorman <mgorman@...hsingularity.net> wrote:
> >
> > Pages with no migration handler use a fallback hander which sometimes
> > works and sometimes persistently fails such as blockdev pages. Migration
> 
> A minor correction. The above statement sounds not accurate anymore
> since Jan Kara had patch series (blkdev: avoid migration stalls for
> blkdev pages) have blockdev use its own migration handler.
> 

I'm aware given that I reviewed that series. The statement was correct
at the time of writing. I'll alter the example when rebased on top of
Jan's work.

-- 
Mel Gorman
SUSE Labs