linux-kernel - Re: [PATCH 3/6] mm/page_alloc.c: remove obsolete comment in free_pcppages

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Date:   Wed, 1 Sep 2021 15:49:03 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
CC:     <akpm@...ux-foundation.org>, <vbabka@...e.cz>,
        <sfr@...b.auug.org.au>, <peterz@...radead.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] mm/page_alloc.c: remove obsolete comment in
 free_pcppages_bulk()

On 2021/8/31 21:38, Mel Gorman wrote:
> On Mon, Aug 30, 2021 at 10:10:48PM +0800, Miaohe Lin wrote:
>> It's also confusing now. Remove it.
>>
> 
> Why is the whole comment obsolete?
> 
> The second two paragraphs about "all pages pinned" and pages_scanned is
> obsolete and can go but the first paragraph is valid.
> 

I think the first paragraph is invalid due to the below statement:
"Assumes all pages on list are in same zone, and of same order."
There are NR_PCP_LISTS lists and PAGE_ALLOC_COSTLY_ORDER + 1 + NR_PCP_THP
orders in pcp. So I think it's obsolete.

Should I delete this statement in the first paragraph only?

Many Thanks.