linux-kernel - Re: [PATCH v2] mm: count zeromap read and set for swapout and swapin

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Message-Id: <20241104194024.0284288a28a71a70a3eab9b0@linux-foundation.org>
Date: Mon, 4 Nov 2024 19:40:24 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: David Hildenbrand <david@...hat.com>
Cc: Barry Song <21cnbao@...il.com>, Usama Arif <usamaarif642@...il.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, Barry Song
 <v-songbaohua@...o.com>, Chengming Zhou <chengming.zhou@...ux.dev>, Yosry
 Ahmed <yosryahmed@...gle.com>, Nhat Pham <nphamcs@...il.com>, Johannes
 Weiner <hannes@...xchg.org>, 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 v2] mm: count zeromap read and set for swapout and
 swapin

On Mon, 4 Nov 2024 13:32:55 +0100 David Hildenbrand <david@...hat.com> wrote:

> > As mentioned above, this isn't about fixing a bug; it's simply to ensure
> > that swap-related metrics don't disappear.
> 
> Documentation/process/submitting-patches.rst:
> 
> "A Fixes: tag indicates that the patch fixes an issue in a previous 
> commit. It is used to make it easy to determine where a bug originated, 
> which can help review a bug fix."
> 
> If there is no BUG, I'm afraid you are abusing that tag.

I think the abuse is reasonable.  We have no Should-be-included-with:.

0ca0c24e3211 is only in 6.12-rcX so this is the time to make
userspace-visible tweaks, so the 6.12 interfaces are the same as the
6.13+ interfaces (which is what I think is happening here?)

And including the Fixes in this patch might be useful to someone who is
backporting 0ca0c24e3211 into some earlier kernel for their own
purposes.