From nobody Mon Jun 22 14:08:32 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 330AFC433F5 for ; Tue, 22 Mar 2022 22:40:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238187AbiCVWlv (ORCPT ); Tue, 22 Mar 2022 18:41:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229687AbiCVWlu (ORCPT ); Tue, 22 Mar 2022 18:41:50 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 597395B3FE for ; Tue, 22 Mar 2022 15:40:22 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id ED79B1F387; Tue, 22 Mar 2022 22:40:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1647988820; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=WU2JEaFQsOONHm05p8N3zxITH7gjDONvFHQ5Zt+mlT4=; b=MC7I60rlvMbnfP5lrOFREWLmIf447EcvBP124LxhI2Waf6csrtc5v4n0GQlzhHFFI4sL4S c8yohMsiZ5H7f79gveWYGQdq56cPMT5UodV6SfWR68YJmQLrxqAg2Xgfmu0S035HdndkoI Y6hhuUbQ8uIvwH8IMOtVhGdWuVtJil0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1647988820; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=WU2JEaFQsOONHm05p8N3zxITH7gjDONvFHQ5Zt+mlT4=; b=bqncOegwQHqeFutqAFWYE66wRVTt5NwTzrDGVzKb0s9k4oygg9vTZpj1Irp0DdVhpZOEZx UezzGoramQfZ/aDQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 5B00B133B6; Tue, 22 Mar 2022 22:40:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id E+ixElRQOmKLagAAMHmgww (envelope-from ); Tue, 22 Mar 2022 22:40:20 +0000 From: Oscar Salvador To: Andrew Morton Cc: Dave Hansen , "Huang, Ying" , Abhishek Goel , Baolin Wang , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [PATCH v2] mm: Untangle config dependencies for demote-on-reclaim Date: Tue, 22 Mar 2022 23:40:16 +0100 Message-Id: <20220322224016.4574-1-osalvador@suse.de> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" At the time demote-on-reclaim was introduced, it was tied to CONFIG_HOTPLUG_CPU + CONFIG_MIGRATE, but that is not really accurate. The only two things we need to depen on is CONFIG_NUMA + CONFIG_MIGRATE, so clean this up. Furthermore, we only register the hotplug memory notifier when the system has CONFIG_MEMORY_HOTPLUG. Signed-off-by: Oscar Salvador Suggested-by: "Huang, Ying" Reviewed-by: "Huang, Ying" --- v1 -> v2: Feedback from "Huang, Ying" --- include/linux/migrate.h | 34 +++++++++++++++------------------- mm/migrate.c | 11 ++++++----- mm/vmstat.c | 2 -- 3 files changed, 21 insertions(+), 26 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index a4a336fd81fc..97407596f058 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -47,17 +47,8 @@ void folio_migrate_copy(struct folio *newfolio, struct f= olio *folio); int folio_migrate_mapping(struct address_space *mapping, struct folio *newfolio, struct folio *folio, int extra_count); =20 -extern bool numa_demotion_enabled; -extern void migrate_on_reclaim_init(void); -#ifdef CONFIG_HOTPLUG_CPU -extern void set_migration_target_nodes(void); -#else -static inline void set_migration_target_nodes(void) {} -#endif #else =20 -static inline void set_migration_target_nodes(void) {} - static inline void putback_movable_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t new, free_page_t free, unsigned long private, enum migrate_mode mode, @@ -82,9 +73,23 @@ static inline int migrate_huge_page_move_mapping(struct = address_space *mapping, return -ENOSYS; } =20 -#define numa_demotion_enabled false #endif /* CONFIG_MIGRATION */ =20 +#if defined(CONFIG_MIGRATION) && defined(CONFIG_NUMA) +extern void set_migration_target_nodes(void); +extern void migrate_on_reclaim_init(void); +extern bool numa_demotion_enabled; +extern int next_demotion_node(int node); +#else +static inline void set_migration_target_nodes(void) {} +static inline void migrate_on_reclaim_init(void) {} +static inline int next_demotion_node(int node) +{ + return NUMA_NO_NODE; +} +#define numa_demotion_enabled false +#endif + #ifdef CONFIG_COMPACTION extern int PageMovable(struct page *page); extern void __SetPageMovable(struct page *page, struct address_space *mapp= ing); @@ -173,15 +178,6 @@ struct migrate_vma { int migrate_vma_setup(struct migrate_vma *args); void migrate_vma_pages(struct migrate_vma *migrate); void migrate_vma_finalize(struct migrate_vma *migrate); -int next_demotion_node(int node); - -#else /* CONFIG_MIGRATION disabled: */ - -static inline int next_demotion_node(int node) -{ - return NUMA_NO_NODE; -} - #endif /* CONFIG_MIGRATION */ =20 #endif /* _LINUX_MIGRATE_H */ diff --git a/mm/migrate.c b/mm/migrate.c index 3364bfaddeef..118f71425241 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2144,7 +2144,6 @@ int migrate_misplaced_page(struct page *page, struct = vm_area_struct *vma, return 0; } #endif /* CONFIG_NUMA_BALANCING */ -#endif /* CONFIG_NUMA */ =20 /* * node_demotion[] example: @@ -2278,7 +2277,6 @@ int next_demotion_node(int node) return target; } =20 -#if defined(CONFIG_HOTPLUG_CPU) /* Disable reclaim-based migration. */ static void __disable_all_migrate_targets(void) { @@ -2471,6 +2469,7 @@ void set_migration_target_nodes(void) * __set_migration_target_nodes() can be used as opposed to * set_migration_target_nodes(). */ +#ifdef CONFIG_MEMORY_HOTPLUG static int __meminit migrate_on_reclaim_callback(struct notifier_block *se= lf, unsigned long action, void *_arg) { @@ -2516,6 +2515,7 @@ static int __meminit migrate_on_reclaim_callback(stru= ct notifier_block *self, =20 return notifier_from_errno(0); } +#endif =20 void __init migrate_on_reclaim_init(void) { @@ -2523,8 +2523,9 @@ void __init migrate_on_reclaim_init(void) sizeof(struct demotion_nodes), GFP_KERNEL); WARN_ON(!node_demotion); - +#ifdef CONFIG_MEMORY_HOTPLUG hotplug_memory_notifier(migrate_on_reclaim_callback, 100); +#endif /* * At this point, all numa nodes with memory/CPus have their state * properly set, so we can build the demotion order now. @@ -2535,7 +2536,6 @@ void __init migrate_on_reclaim_init(void) set_migration_target_nodes(); cpus_read_unlock(); } -#endif /* CONFIG_HOTPLUG_CPU */ =20 bool numa_demotion_enabled =3D false; =20 @@ -2596,4 +2596,5 @@ static int __init numa_init_sysfs(void) return err; } subsys_initcall(numa_init_sysfs); -#endif +#endif /* CONFIG_SYSFS */ +#endif /* CONFIG_NUMA */ diff --git a/mm/vmstat.c b/mm/vmstat.c index b75b1a64b54c..f2d0dec1062d 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -2111,9 +2111,7 @@ void __init init_mm_internals(void) =20 start_shepherd_timer(); #endif -#if defined(CONFIG_MIGRATION) && defined(CONFIG_HOTPLUG_CPU) migrate_on_reclaim_init(); -#endif #ifdef CONFIG_PROC_FS proc_create_seq("buddyinfo", 0444, NULL, &fragmentation_op); proc_create_seq("pagetypeinfo", 0400, NULL, &pagetypeinfo_op); --=20 2.34.1