Re: [PATCH v8] mm/page_owner.c: add llseek for page_owner

[Kassey Li]

On 8/18/2022 12:13 AM, Andrew Morton wrote:
> On Tue, 16 Aug 2022 10:07:48 +0800 Kassey Li <quic_yingangl@xxxxxxxxxxx> wrote:
>
> > There is usage to dump a given cma region page_owner
> > instead of all page's.
>
> So... dump all the pages and then parse out the ones you're interested in?
>
> Presumably this is too slow and presumably you have a use case in which
> this operation needs speeding up?  If so, please fully describe all of
> this in the changelog.  If not then please fully still describe the
> reasons for making this change.
that is correct, I will update the change log for detail make it easy to 
know why we need this change.