linux-kernel - Re: [PATCH] mm/page_owner.c: allow page_owner with given start

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Message-ID: <YtrEXB6o+VROImdg@casper.infradead.org>
Date:   Fri, 22 Jul 2022 16:38:04 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Kassey Li <quic_yingangl@...cinc.com>
Cc:     akpm@...ux-foundation.org, minchan@...nel.org,
        iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] mm/page_owner.c: allow page_owner with given
 start_pfn/count

On Fri, Jul 22, 2022 at 11:08:10PM +0800, Kassey Li wrote:
> by default, page_owner iterates all page from min_low_pfn to
> max_pfn, this cost too much time if we want an alternative pfn range.
> 
> with this patch it allows user to set pfn range to dump the page_onwer.

This is a really bad UI.  If two users try to do different ranges at the
same time, it'll go wrong.  What use cases are you actually trying to
solve?