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

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Message-ID: <CAJuCfpE323zBTNhE7Ui_JCiNn4cb-w+Hu3Paxi00EicWULLfwA@mail.gmail.com>
Date: Thu, 5 Sep 2024 17:03:33 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Yu Zhao <yuzhao@...gle.com>, Kent Overstreet <kent.overstreet@...ux.dev>, 
	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 Thu, Sep 5, 2024 at 4:25 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> 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?

Yes, should be CC'ed to stable #6.10

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

I think for this one Fixes: dcfe378c81f7 ("lib: introduce support for
page allocation tagging") would be the most appropriate.

I'll review all 3 fixes later today.
Thanks!