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(Meta)" , From: "Zi Yan" Subject: Re: [PATCH v5 03/12] mm, page_alloc: pass zone pointer to trace_reclaim_retry_zone Cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , "Josef Bacik" , X-Mailer: aerc 0.22.0 References: <20261101021340.2251928-1-gourry@gourry.net> <20261101021340.2251928-4-gourry@gourry.net> In-Reply-To: <20261101021340.2251928-4-gourry@gourry.net> X-ClientProxiedBy: BLAPR03CA0146.namprd03.prod.outlook.com (2603:10b6:208:32e::31) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DM4PR12MB8452:EE_ X-MS-Office365-Filtering-Correlation-Id: f20a3f22-0ef5-4c72-da4e-08df3856ac47 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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 WV+J1ZCF 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sat Oct 31, 2026 at 10:13 PM EDT, Gregory Price (Meta) wrote: > From: Josef Bacik > > should_reclaim_retry() walks a zonelist and passes the zoneref pointer > to the reclaim_retry_zone tracepoint, which loads the zone from the > entry again to find the node. > > Memory hotplug rebuilds the zonelists in place while allocations are > under way. When a zone in front of the zoneref entry has become empty, > the entries move up, and this one can be the end marker by the time the > tracepoint looks at it. zonelist_node_idx() then dereferences a NULL > zone. Short of that, the event can name another zone than the one its > numbers belong to. > > Pass the zone pointer instead of the zoneref pointer. > > Fixes: d379f01de095 ("oom, trace: add oom detection tracepoints") > Cc: > Assisted-by: LLM > Signed-off-by: Josef Bacik > Signed-off-by: David Hildenbrand (Arm) > Signed-off-by: Vlastimil Babka (SUSE) > Signed-off-by: Gregory Price (Meta) > --- > include/trace/events/oom.h | 8 ++++---- > mm/page_alloc.c | 2 +- > 2 files changed, 5 insertions(+), 5 deletions(-) > Makes sense. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi