From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5CA922B8D0 for ; Tue, 3 Jun 2025 11:09:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748948950; cv=none; b=lJAgLmE/jBQCHwBPjco8CrgJi9wpIajsE8dGnwk0goKeV05loBhCmxGyQqDtNtaXs4N8x45Y9Bj1nCIptoz3bJBspMdaQnX7UJTlAadA42YRalJdj0/24C2938tNbrhtYXlRzdtSzwj7iJUbFpngn12kOmeDimypQBlW/m4QM4s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748948950; c=relaxed/simple; bh=L5h4hpSRdlmDM9lqgnn7VIpuhmBKhIQB6y6dM5/PEJQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cR0paw3m4U4MtzTONdnjKKTSXhTFCZJb7hn4tVvvS1FZux4Rp/5DjQozl6TTd0MpP2/E3UH4gMtk8ZQGLjhufZZANMjSIH8qoY4Svs4wro8BRnfcnulkJpuvTtV+vnRaFEneRqKM1RkOULaFTPB//U5C1g0+97tw3hL/whdEVW0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; arc=none smtp.client-ip=195.135.223.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 055082121C; Tue, 3 Jun 2025 11:09:07 +0000 (UTC) Authentication-Results: smtp-out1.suse.de; none Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 6E9C213AAD; Tue, 3 Jun 2025 11:09:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id oEXkF9LXPmjfXQAAD6G6ig (envelope-from ); Tue, 03 Jun 2025 11:09:06 +0000 From: Oscar Salvador To: Andrew Morton Cc: David Hildenbrand , Vlastimil Babka , Jonathan Cameron , Harry Yoo , Rakie Kim , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [PATCH v4 1/3] mm,slub: Do not special case N_NORMAL nodes for slab_nodes Date: Tue, 3 Jun 2025 13:08:48 +0200 Message-ID: <20250603110850.192912-2-osalvador@suse.de> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250603110850.192912-1-osalvador@suse.de> References: <20250603110850.192912-1-osalvador@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spam-Level: X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[]; TAGGED_RCPT(0.00)[] X-Spam-Flag: NO X-Rspamd-Queue-Id: 055082121C X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Spam-Score: -4.00 Currently, slab_mem_going_going_callback() checks whether the node has N_NORMAL memory in order to be set in slab_nodes. While it is true that gettind rid of that enforcing would mean ending up with movables nodes in slab_nodes, the memory waste that comes with that is negligible. So stop checking for status_change_nid_normal and just use status_change_nid instead which works for both types of memory. Also, once we allocate the kmem_cache_node cache for the node in slab_mem_online_callback(), we never deallocate it in slab_mem_off_callback() when the node goes memoryless, so we can just get rid of it. The side effects are that we will stop clearing the node from slab_nodes, and also that newly created kmem caches after node hotremove will now allocate their kmem_cache_node for the node(s) that was hotremoved, but these should be negligible. Suggested-by: David Hildenbrand Signed-off-by: Oscar Salvador Reviewed-by: Vlastimil Babka --- mm/slub.c | 34 +++------------------------------- 1 file changed, 3 insertions(+), 31 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index be8b09e09d30..f92b43d36adc 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -447,7 +447,7 @@ static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) /* * Tracks for which NUMA nodes we have kmem_cache_nodes allocated. - * Corresponds to node_state[N_NORMAL_MEMORY], but can temporarily + * Corresponds to node_state[N_MEMORY], but can temporarily * differ during memory hotplug/hotremove operations. * Protected by slab_mutex. */ @@ -6160,36 +6160,12 @@ static int slab_mem_going_offline_callback(void *arg) return 0; } -static void slab_mem_offline_callback(void *arg) -{ - struct memory_notify *marg = arg; - int offline_node; - - offline_node = marg->status_change_nid_normal; - - /* - * If the node still has available memory. we need kmem_cache_node - * for it yet. - */ - if (offline_node < 0) - return; - - mutex_lock(&slab_mutex); - node_clear(offline_node, slab_nodes); - /* - * We no longer free kmem_cache_node structures here, as it would be - * racy with all get_node() users, and infeasible to protect them with - * slab_mutex. - */ - mutex_unlock(&slab_mutex); -} - static int slab_mem_going_online_callback(void *arg) { struct kmem_cache_node *n; struct kmem_cache *s; struct memory_notify *marg = arg; - int nid = marg->status_change_nid_normal; + int nid = marg->status_change_nid; int ret = 0; /* @@ -6247,10 +6223,6 @@ static int slab_memory_callback(struct notifier_block *self, case MEM_GOING_OFFLINE: ret = slab_mem_going_offline_callback(arg); break; - case MEM_OFFLINE: - case MEM_CANCEL_ONLINE: - slab_mem_offline_callback(arg); - break; case MEM_ONLINE: case MEM_CANCEL_OFFLINE: break; @@ -6321,7 +6293,7 @@ void __init kmem_cache_init(void) * Initialize the nodemask for which we will allocate per node * structures. Here we don't need taking slab_mutex yet. */ - for_each_node_state(node, N_NORMAL_MEMORY) + for_each_node_state(node, N_MEMORY) node_set(node, slab_nodes); create_boot_cache(kmem_cache_node, "kmem_cache_node", -- 2.49.0