linux-kernel - Re: [PATCH v11 0/6] Use pageblock_order for cma and alloc_contig

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Date:   Fri, 20 May 2022 19:41:00 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Zi Yan <ziy@...dia.com>
CC:     David Hildenbrand <david@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Eric Ren <renzhengeek@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Oscar Salvador" <osalvador@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v11 0/6] Use pageblock_order for cma and
 alloc_contig_range alignment.

On Fri, May 20, 2022 at 05:56:52PM -0400, Zi Yan wrote:
> Do you have the page information like refcount, map count, mapping, index, and
> page flags? That would be more helpful. Thanks.

page:fffffc200c7f8000 refcount:393 mapcount:1 mapping:0000000000000000 index:0xffffbb800 pfn:0x8039fe00
head:fffffc200c7f8000 order:9 compound_mapcount:0 compound_pincount:0
memcg:ffff40026005a000
anon flags: 0xbfffc000009001c(uptodate|dirty|lru|head|swapbacked|node=0|zone=2|lastcpupid=0xffff)
raw: 0bfffc000009001c fffffc2007b74048 fffffc2009c087c8 ffff08038dab9189
raw: 0000000ffffbb800 0000000000000000 0000018900000000 ffff40026005a000

> I cannot reproduce it locally after hundreds of iterations of flip_mem.py on my
> x86_64 VM and bare metal.
> 
> What ARM machine are you using? I wonder if I am able to get one locally.

Ampere Altra.