Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Zi Yan <ziy@nvidia.com>
To:     Qian Cai <quic_qiancai@quicinc.com>
Cc:     David Hildenbrand <david@redhat.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        virtualization@lists.linux-foundation.org,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Eric Ren <renzhengeek@gmail.com>,
        Mike Rapoport <rppt@kernel.org>,
        Oscar Salvador <osalvador@suse.de>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v11 0/6] Use pageblock_order for cma and alloc_contig_range alignment.
Date:   Fri, 20 May 2022 17:56:52 -0400
Message-ID: <C1636974-A315-4E0A-81C2-845878429920@nvidia.com>
In-Reply-To: <Yofu5wUgov+2eVCE@qian>
References: <20220427132720.GC71@qian>
 <1D88AE1B-4DFC-400F-A054-662E3824C9AF@nvidia.com>
 <A1956578-A851-4BF3-BD57-12571244DB5E@nvidia.com> <20220428123308.GA71@qian>
 <0E75B247-8150-48A3-83AE-56C586030006@nvidia.com> <YoavU/+NfQIzQiDF@qian>
 <F6598450-EFE0-4EA9-912B-A727DE1F8185@nvidia.com> <Yod71OhUa3VWWPCG@qian>
 <48D48FDC-B8DD-41C9-B56A-EBD7314883AB@nvidia.com>
 <A03D6267-5945-4A6A-9C55-5F3DDDB35CC2@nvidia.com> <Yofu5wUgov+2eVCE@qian>
Content-Type: multipart/signed;
 boundary="=_MailMate_0AE5638F-1356-4F7F-A5FF-89BDA0F4413F_=";
 micalg=pgp-sha512; protocol="application/pgp-signature"
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?bMwyC2pJhDsmtCd1TjKb793efwWh9H0C5V/nF8HvNIL61W6TmL4bNt02UzLZ?=
 =?us-ascii?Q?tawPUcp6dANd+VToqZOkwaT+fnUf7H5gOTIrLF6AyumILRDMHgD2Nv+7BaOb?=
 =?us-ascii?Q?WxEBA8hNP/OW1/A7Ljjqumimrv0lbyqdZv2XPnf5dIaQo5gWWA0rKBgJr5cM?=
 =?us-ascii?Q?mpSzDCqW6L4EuflAo7BllLHf7+m1t1KUZ3g+X2ud9JBueMGc15sJxWlg2iLR?=
 =?us-ascii?Q?8JcxRBw3EXoqknODKCFpmx3v2BQv2zKCLGw6b7SK/Twti90Fpq7MOIEQWI9s?=
 =?us-ascii?Q?UbYuFJn2EcpQi72L/Smo8vZ+PTLEFFNRX+SFCTMt/OK46EdaqFuObYdkZAQZ?=
 =?us-ascii?Q?kjMe5WhvJW6dEVvM3KfXiYNyf5lGF5qqGd/lqG0qDel1DW3VJlR58l994uDg?=
 =?us-ascii?Q?lPplSZt/T/7X8LyBQYFgnMjAq89RhW3VvBnb/AuQYK5Z3GDg4risuc2g/QlU?=
 =?us-ascii?Q?Zxe1VJUgy2hrACTXRVatJJP/KAK29TeZRy0KE9Iu+b/E/tOFFiv8w/lO+8+p?=
 =?us-ascii?Q?aUuy8JPqlDgyT485AaLhTlSpx1CkbCsp1ZK8U2tXYKLriPzAcQIKZJO0ZBAZ?=
 =?us-ascii?Q?otKneBVLkcsuLYte7rglL4T01Ht454+wd1I0I1OREXDd1PTyeHzHXQiteXBr?=
 =?us-ascii?Q?gw972vfQrjRL4jrxv0bm2k/6O1UUeZwyar9nGCtP0EO39HI0DQRGsL/TkrKg?=
 =?us-ascii?Q?YV1nOywOx1wRSyfYLb+o+bSyWJwJUPpRStXNwsoafF5vfKnd/bw+HBwJVJPY?=
 =?us-ascii?Q?KPfT4zJ6JoNr3PvA3jJaLia5oGTTG8nANx7ksm0OG6kTG8pc8jAzy01O3G87?=
 =?us-ascii?Q?gBhcMcmfKcZ1R8PVWyb0j100+fr7VZtn3fnQKScd0OfLm4kOHk2PlWGuCJgE?=
 =?us-ascii?Q?34uHoRfs3HRxQABsh0ycEHQG10ggUpw3ePHFuzLANFjMnRhXhlUQevdw736t?=
 =?us-ascii?Q?/n/fF3poZfobH55WavpQUzZcovMs57mWBZCAU6QpZB3Il2tmG3OIs3AOD2H3?=
 =?us-ascii?Q?q54yuPhMiwjudtUeizFdCYzYxXG96vun6VAVfb/McYRxECrDYr5AXtMs0t4J?=
 =?us-ascii?Q?17KW7koIRH23Dgr9L0r+D/ClYe1sjrJ7O0NaIelqrR5Bzu7Rw7sPdMNuBfF9?=
 =?us-ascii?Q?t8Yo3ls3dXhGJRvomuKRrdzQ70ScYUPlB/a1tV8aY2fe3Rh0vYOFIOcP9t1m?=
 =?us-ascii?Q?aPU1tlBeyoGGZFMts1imkgwvRu7LTBr4TYc/6Zaw6T5n+gLZkVY4U9Ll/Veq?=
 =?us-ascii?Q?JkCqQ8YDVAvIzQ/3ZE4xqxnjDPsg0tcXWvTkxVir6pLuy4Ct11ezXRXSh4S6?=
 =?us-ascii?Q?wQye63ud3yXtIf5OfbQglLiNzajrmyyfocBurP7rfw54nr2uGRoM4+vzGAvN?=
 =?us-ascii?Q?t4UrokMFQqTTIKZzFIQUFnwiDp9YzTzEQvagX8ML/9h0fEE6AhXhPVMh6nQR?=
 =?us-ascii?Q?RBd/FlnDF9YRlswfwi9pLyLHEyYn4HwMOI4CfQyacIVVKW0OOBCHf1gty4QI?=
 =?us-ascii?Q?2w4Om9v2X32taE7pmKEpCL3oIZA85zUG1mjpZ67EQCy92XKjIt8Td3nvccS0?=
 =?us-ascii?Q?TAc/DrIOs5V2llfDzD5Ac+dtkAL+fp9z61pmiIZDA21IfmNf1ARMLzY4ZNCa?=
 =?us-ascii?Q?rT/FA0WWqNxJBpI9anYYepSyKnm+FyNcJsJ5lS06fgD4xrWAvsKWo9O/H1V5?=
 =?us-ascii?Q?q7crRPtc97h8RqEZ4bRcv73RpzhEP3a3b3QYJCgRB4pWJttgzxdFXos1wFF5?=
 =?us-ascii?Q?4z8fKf5CYA=3D=3D?=
X-OriginatorOrg: Nvidia.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 3f7041f1-c75a-40f9-7194-08da3aaba717
X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB5744.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 May 2022 21:56:54.5058
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: wHS/2lGkDY42j4cTZ71B3GBLcEsWlktI6VlVQwWdZCGr0fw+fBjc2NqGdOSDqx63
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR12MB3523
X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
        DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,
        RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,
        T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

--=_MailMate_0AE5638F-1356-4F7F-A5FF-89BDA0F4413F_=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

On 20 May 2022, at 15:41, Qian Cai wrote:

> On Fri, May 20, 2022 at 10:13:51AM -0400, Zi Yan wrote:
>> Also, do you mind providing the page dump of the 512-page compound pag=
e? I would like
>> to know what page caused the issue.
>
>  page last allocated via order 9, migratetype Movable, gfp_mask 0x3c24c=
a(GFP_TRANSHUGE|__GFP_THISNODE), pid 831, tgid 831 (khugepaged), ts 38998=
65924520, free_ts 3821953009040
>   post_alloc_hook
>   get_page_from_freelist
>   __alloc_pages
>   khugepaged_alloc_page
>   collapse_huge_page
>   khugepaged_scan_pmd
>   khugepaged_scan_mm_slot
>   khugepaged
>   kthread
>   ret_from_fork
>  page last free stack trace:
>   free_pcp_prepare
>   free_unref_page
>   free_compound_page
>   free_transhuge_page
>   __put_compound_page
>   release_pages
>   free_pages_and_swap_cache
>   tlb_batch_pages_flush
>   tlb_finish_mmu
>   exit_mmap
>   __mmput
>   mmput
>   exit_mm
>   do_exit
>   do_group_exit
>   __arm64_sys_exit_group

Do you have the page information like refcount, map count, mapping, index=
, and
page flags? That would be more helpful. Thanks.

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.=


Thanks.

--
Best Regards,
Yan, Zi

--=_MailMate_0AE5638F-1356-4F7F-A5FF-89BDA0F4413F_=
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=gmPn
-----END PGP SIGNATURE-----

--=_MailMate_0AE5638F-1356-4F7F-A5FF-89BDA0F4413F_=--