linux-kernel - Re: [PATCH V4] mm/vmstat: Add events for THP migration without split

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Message-ID: <50cc0a0d-e04e-9e5d-26a6-73a91944ba8c@arm.com>
Date:   Fri, 10 Jul 2020 09:00:09 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-mm@...ck.org
Cc:     Jonathan Corbet <corbet@....net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Matthew Wilcox <willy@...radead.org>, Zi Yan <ziy@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4] mm/vmstat: Add events for THP migration without split


On 07/09/2020 09:04 PM, Randy Dunlap wrote:
> Hi,
> 
> I have a few comments on this.
> 
> a. I reported it very early and should have been Cc-ed.

I should have Cc-ed you on this V4 patch, sorry about that.

> 
> b. A patch that applies to mmotm or linux-next would have been better
> than a full replacement patch.
I have followed that (i.e patch on mmotm/next as fix) only when the
required change is smaller as compared to the series on mmotm/next.
But for others a new patch should be better which can be replaced
on mmotm and next. At least that is my understanding and would like
to be corrected otherwise.

> 
> c. I tried replacing what I believe is the correct/same patch file in mmotm
> and still have build errors.

That should not have happened, all new THP migration events are with
CONFIG_MIGRATION rather than CONFIG_TRANSPARENT_HUGEPAGE previously.