Re: [PATCH] mm: page_alloc: simpify page del and expand

[Huan Yang]

在 2024/8/28 8:59, Andrew Morton 写道:
> On Mon, 26 Aug 2024 14:40:48 +0800 Huan Yang <link@xxxxxxxx> wrote:
>
> > When page del from buddy and need expand, it will account free_pages
> > in zone's migratetype.
> >
> > The current way is to subtract the page number of the current order
> > when deleting, and then add it back when expanding.
> >
> > This is unnecessary, as when migrating the same type, we can directly
> > record the difference between the high-order pages and the expand
> > added, and then subtract it directly.
> >
> > This patch merge that, only when del and expand done, then account
> > free_pages.
> It isn't obvious to me that this is a significant improvement.  Am I
> missing something?

No, this is all. Just want to avoid account twice.(add then sub)

Thanks.

>