linux-kernel - Re: [PATCH mm-unstable v1 3/3] mm/codetag: add pgalloc_tag

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Message-Id: <20240905162524.72c5bbefa075adb466ea6057@linux-foundation.org>
Date: Thu, 5 Sep 2024 16:25:24 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Yu Zhao <yuzhao@...gle.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, Suren Baghdasaryan
 <surenb@...gle.com>, Muchun Song <muchun.song@...ux.dev>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH mm-unstable v1 3/3] mm/codetag: add pgalloc_tag_copy()

On Tue,  3 Sep 2024 15:36:49 -0600 Yu Zhao <yuzhao@...gle.com> wrote:

> Add pgalloc_tag_copy() to transfer the codetag from the old folio to
> the new one during migration. This makes original allocation sites
> persist cross migration rather than lump into compaction_alloc, e.g.,
>   # echo 1 >/proc/sys/vm/compact_memory
>   # grep compaction_alloc /proc/allocinfo
> 
> Before this patch:
>   132968448  32463  mm/compaction.c:1880 func:compaction_alloc
> 
> After this patch:
>           0      0  mm/compaction.c:1880 func:compaction_alloc
> 

I'm thinking that [2/3] should be backported?

And possibly this one, but for that we should identify a Fixes:, please.