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[79.242.62.87]) by smtp.gmail.com with ESMTPSA id c10sm397552wrb.81.2021.12.07.10.03.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Dec 2021 10:03:29 -0800 (PST) Message-ID: Date: Tue, 7 Dec 2021 19:03:28 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Content-Language: en-US To: Alexey Makhalov Cc: Michal Hocko , Dennis Zhou , Eric Dumazet , "linux-mm@kvack.org" , Andrew Morton , Oscar Salvador , Tejun Heo , Christoph Lameter , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" References: <1043a1a4-b7f2-8730-d192-7cab9f15ee24@redhat.com> <77e785e6-cf34-0cff-26a5-852d3786a9b8@redhat.com> <2E174230-04F3-4798-86D5-1257859FFAD8@vmware.com> <21539fc8-15a8-1c8c-4a4f-8b85734d2a0e@redhat.com> <78E39A43-D094-4706-B4BD-18C0B18EB2C3@vmware.com> From: David Hildenbrand Organization: Red Hat Subject: Re: [PATCH v3] mm: fix panic in __alloc_pages In-Reply-To: <78E39A43-D094-4706-B4BD-18C0B18EB2C3@vmware.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07.12.21 18:17, Alexey Makhalov wrote: > > >> On Dec 7, 2021, at 9:13 AM, David Hildenbrand wrote: >> >> On 07.12.21 18:02, Alexey Makhalov wrote: >>> >>> >>>> On Dec 7, 2021, at 8:36 AM, Michal Hocko wrote: >>>> >>>> On Tue 07-12-21 17:27:29, Michal Hocko wrote: >>>> [...] >>>>> So your proposal is to drop set_node_online from the patch and add it as >>>>> a separate one which handles >>>>> - sysfs part (i.e. do not register a node which doesn't span a >>>>> physical address space) >>>>> - hotplug side of (drop the pgd allocation, register node lazily >>>>> when a first memblocks are registered) >>>> >>>> In other words, the first stage >>>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >>>> index c5952749ad40..f9024ba09c53 100644 >>>> --- a/mm/page_alloc.c >>>> +++ b/mm/page_alloc.c >>>> @@ -6382,7 +6382,11 @@ static void __build_all_zonelists(void *data) >>>> if (self && !node_online(self->node_id)) { >>>> build_zonelists(self); >>>> } else { >>>> - for_each_online_node(nid) { >>>> + /* >>>> + * All possible nodes have pgdat preallocated >>>> + * free_area_init >>>> + */ >>>> + for_each_node(nid) { >>>> pg_data_t *pgdat = NODE_DATA(nid); >>>> >>>> build_zonelists(pgdat); >>> >>> Will it blow up memory usage for the nodes which might never be onlined? >>> I prefer the idea of init on demand. >>> >>> Even now there is an existing problem. >>> In my experiments, I observed _huge_ memory consumption increase by increasing number >>> of possible numa nodes. I’m going to report it in separate mail thread. >> >> I already raised that PPC might be problematic in that regard. Which >> architecture / setup do you have in mind that can have a lot of possible >> nodes? >> > It is x86_64 VMware VM, not the regular one, but specially configured (1 vCPU per node, > with hot-plug support, 128 possible nodes) I thought the pgdat would be smaller but I just gave it a test: On my system, pgdata_t is 173824 bytes. So 128 nodes would correspond to 21 MiB, which is indeed a lot. I assume it's due to "struct zonelist", which has MAX_ZONES_PER_ZONELIST == (MAX_NUMNODES * MAX_NR_ZONES) zone references ... -- Thanks, David / dhildenb