linux-kernel - Re: [PATCH v8] mm/page_owner.c: add llseek for page

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Message-Id: <20220817091324.59afdb143b6330974f4e9e4c@linux-foundation.org>
Date:   Wed, 17 Aug 2022 09:13:24 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Kassey Li <quic_yingangl@...cinc.com>
Cc:     vbabka@...nel.org, minchan@...nel.org, vbabka@...e.cz,
        iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v8] mm/page_owner.c: add llseek for page_owner

On Tue, 16 Aug 2022 10:07:48 +0800 Kassey Li <quic_yingangl@...cinc.com> 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.