linux-kernel - Re: [PATCH v5 14/37] lib: introduce support for page allocation tagging

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Message-ID: <CAJuCfpEpMwfEgrsMALqpzH=3FL0WxrXY1bRkvezMdCw2BAtQRg@mail.gmail.com>
Date: Fri, 15 Mar 2024 08:47:00 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Matthew Wilcox <willy@...radead.org>
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Subject: Re: [PATCH v5 14/37] lib: introduce support for page allocation tagging

On Fri, Mar 15, 2024 at 7:24 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, Mar 06, 2024 at 10:24:12AM -0800, Suren Baghdasaryan wrote:
> > +static inline void pgalloc_tag_add(struct page *page, struct task_struct *task,
> > +                                unsigned int order)
>
> If you make this "unsigned int nr" instead of order, (a) it won't look
> completely insane (what does adding an order even mean?) and (b) you
> can reuse it from the __free_pages path.

Sounds good to me.

>
> > @@ -1101,6 +1102,7 @@ __always_inline bool free_pages_prepare(struct page *page,
> >               /* Do not let hwpoison pages hit pcplists/buddy */
> >               reset_page_owner(page, order);
> >               page_table_check_free(page, order);
> > +             pgalloc_tag_sub(page, order);
>
> Obviously you'll need to make sure all the callers now pass in 1 <<
> order instead of just order.

Ack.

>