linux-kernel - Re: [PATCH v3] mm: count zeromap read and set for swapout and swapin

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Message-Id: <20241106124225.632b42c3680cae0b940d2871@linux-foundation.org>
Date: Wed, 6 Nov 2024 12:42:25 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Barry Song <21cnbao@...il.com>
Cc: Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>, Nhat Pham
 <nphamcs@...il.com>, Usama Arif <usamaarif642@...il.com>, Chengming Zhou
 <chengming.zhou@...ux.dev>, Yosry Ahmed <yosryahmed@...gle.com>, Hailong
 Liu <hailong.liu@...o.com>, David Hildenbrand <david@...hat.com>, Hugh
 Dickins <hughd@...gle.com>, Matthew Wilcox <willy@...radead.org>, Shakeel
 Butt <shakeel.butt@...ux.dev>, Andi Kleen <ak@...ux.intel.com>, Baolin Wang
 <baolin.wang@...ux.alibaba.com>, Chris Li <chrisl@...nel.org>,
 "Huang, Ying" <ying.huang@...el.com>, Kairui Song <kasong@...cent.com>,
 Ryan Roberts <ryan.roberts@....com>
Subject: Re: [PATCH v3] mm: count zeromap read and set for swapout and
 swapin

On Thu, 7 Nov 2024 09:01:14 +1300 Barry Song <21cnbao@...il.com> wrote:

> Oops, it seems that it depends on Kanchana's 'mm: change count_objcg_event() to
> count_objcg_events() for batch event updates,' which also isn't present in 6.12.
> 
> Otherwise, it won't build, as reported here:
> https://lore.kernel.org/linux-mm/CAGsJ_4whD31+Lk0m2uq-o=ygvkRsw1uXcPeqxBONV-RUXkeEzg@mail.gmail.com/

argh.

> Hi Andrew,
> What’s the best approach here? Should we include Kanchana's patch that extends
> the nr argument for count_objcg_events() in 6.12-rc as well?

Let's do the right thing here.  I'll drop this patch from mm-hotfixes. 
Please send a v4 against Linus mainline fairly soon then I'll redo
Kanchana's series around that.