linux-kernel - Re: [PATCH] mm/vmstat: Add events for PMD based THP migration without split

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Message-ID: <20200602145208.qucum52lwslhiqff@ca-dmjordan1.us.oracle.com>
Date:   Tue, 2 Jun 2020 10:52:08 -0400
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>, linux-mm@...ck.org,
        hughd@...gle.com, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Zi Yan <ziy@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmstat: Add events for PMD based THP migration
 without split

On Mon, Jun 01, 2020 at 09:48:09PM -0700, John Hubbard wrote:
> However, the fact that this is under discussion hints at the need for a
> bit of documentation help. What do you think about adding some notes about
> all of this to, say, Documentation/vm/page_migration.rst ?

Yes, that would be good.  I understand the intent better now but still think
the 'failure' event could be misinterpreted as outright failure instead of
splitting followed by successfully moving the constituent pages.

It might help to clarify in the changelog as well.