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Baghdasaryan" , "Michal Hocko" , "Brendan Jackman" , "Johannes Weiner" , , To: "Ye Liu" , "Andrew Morton" , "Vlastimil Babka" From: "Zi Yan" Subject: Re: [PATCH v2 2/6] mm/page_owner: use MIGRATE_REASON_NONE instead of -1 for last_migrate_reason X-Mailer: aerc 0.21.0 References: <20260626024550.25677-1-ye.liu@linux.dev> <20260626024550.25677-3-ye.liu@linux.dev> In-Reply-To: <20260626024550.25677-3-ye.liu@linux.dev> X-ClientProxiedBy: CH2PR03CA0019.namprd03.prod.outlook.com (2603:10b6:610:59::29) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|SAWPR12MB999166:EE_ X-MS-Office365-Filtering-Correlation-Id: 0d93964d-b4cb-477e-0f99-08ded3b310ee X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|23010399003|366016|6133799003|18002099003|22082099003|56012099006|4143699003|11063799006; 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GoXqipx/+/iz3pR/5cwzBrItodkmij1gyXfGTRlCZD6lpY17rzmR6JjF1wQoGOwZRbU/VQdvRXz5i5z9DMVLpQ51S4rq2pje3KmwaZLrBYIqP8vKN7uoASlEmP3pboITuZ5GymK/IvF9+P55rg8TcE3UhM1kwnaL4NsalGO0L9PfR8AVMB0LxoXrZJdkTZcod5dxFTR1xt+vovZ5+trFLAixpgriP6VOZahBJ+xBdReq3/S+SnIHm50bGN7Yxp6oAJQm4V43Ws+ql3EAWACTQeGZs43ZG4qpg1DXcnlPbq51gSZllQyKXtFnwkNSU34zytjKYru3E3G42dqA6jreSyx7TGXuccQH23rm6NG7fLSJnXLZrPJzUaEk1NrvcSIg2z3q37jEm7HDiDnOidaNokozSYU5uz1QhNfzuC3Jh5eZmibQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Jun 25, 2026 at 10:45 PM EDT, Ye Liu wrote: > The last_migrate_reason field uses -1 as a sentinel value to mean "no > migration has happened". Replace the four bare -1 occurrences with a > local MIGRATE_REASON_NONE define so the intent is explicit and the > magic number is eliminated. > > No functional change. > > Signed-off-by: Ye Liu > --- > mm/page_owner.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > > diff --git a/mm/page_owner.c b/mm/page_owner.c > index 342549891a8d..ebafa9d7ff07 100644 > --- a/mm/page_owner.c > +++ b/mm/page_owner.c > @@ -21,6 +21,13 @@ > */ > #define PAGE_OWNER_STACK_DEPTH (16) > =20 > +/* > + * Used to indicate that a page has never been migrated, as the valid > + * migrate_reason values are non-negative enum members (MR_* in > + * include/linux/migrate_mode.h). Why not change last_migrate_reason to enum migrate_reason and functions pass migrate reasons? MR_TYPES probably can be used to indicate no migration has happened if we do not want to add MR_NO_MIGRATION. folio_set_owner_migrate_reason(), __folio_set_owner_migrate_reason(), move_hugetlb_state(), and __update_page_owner_handle() need to update their signatures for this. > + */ > +#define MIGRATE_REASON_NONE (-1) > + > struct page_owner { > unsigned short order; > short last_migrate_reason; > @@ -339,7 +346,7 @@ noinline void __set_page_owner(struct page *page, uns= igned short order, > depot_stack_handle_t handle; > =20 > handle =3D save_stack(gfp_mask); > - __update_page_owner_handle(page, handle, order, gfp_mask, -1, > + __update_page_owner_handle(page, handle, order, gfp_mask, MIGRATE_REASO= N_NONE, > ts_nsec, current->pid, current->tgid, > current->comm); > inc_stack_record_count(handle, gfp_mask, 1 << order); > @@ -596,7 +603,7 @@ print_page_owner(char __user *buf, size_t count, unsi= gned long pfn, > if (ret >=3D count) > goto err; > =20 > - if (page_owner->last_migrate_reason !=3D -1) { > + if (page_owner->last_migrate_reason !=3D MIGRATE_REASON_NONE) { > ret +=3D scnprintf(kbuf + ret, count - ret, > "Page has been migrated, last migrate reason: %s\n", > migrate_reason_names[page_owner->last_migrate_reason]); > @@ -667,7 +674,7 @@ void __dump_page_owner(const struct page *page) > stack_depot_print(handle); > } > =20 > - if (page_owner->last_migrate_reason !=3D -1) > + if (page_owner->last_migrate_reason !=3D MIGRATE_REASON_NONE) > pr_alert("page has been migrated, last migrate reason: %s\n", > migrate_reason_names[page_owner->last_migrate_reason]); > page_ext_put(page_ext); > @@ -826,7 +833,7 @@ static void init_pages_in_zone(struct zone *zone) > =20 > /* Found early allocated page */ > __update_page_owner_handle(page, early_handle, 0, 0, > - -1, local_clock(), current->pid, > + MIGRATE_REASON_NONE, local_clock(), current->pid, > current->tgid, current->comm); > count++; > ext_put_continue: --=20 Best Regards, Yan, Zi