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 ctJ9CPxR 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 03, 2025 at 03:08:18PM +0200, David Hildenbrand wrote: > On 03.04.25 15:02, David Hildenbrand wrote: > > On 02.04.25 19:03, Oscar Salvador wrote: > > > On Wed, Apr 02, 2025 at 06:06:51PM +0200, Vlastimil Babka wrote: > > > > What if we had two chains: > > > > > > > > register_node_notifier() > > > > register_node_normal_notifier() > > > > > > > > I think they could have shared the state #defines and struct node_notify > > > > would have just one nid and be always >= 0. > > > > > > > > Or would it add too much extra boilerplate and only slab cares? > > > > > > We could indeed go on that direction to try to decouple > > > status_change_nid from status_change_nid_normal. > > > > > > Although as you said, slub is the only user of status_change_nid_normal > > > for the time beign, so I am not sure of adding a second chain for only > > > one user. > > > > > > Might look cleaner though, and the advantatge is that slub would not get > > > notified for nodes adquiring only ZONE_MOVABLE. > > > > > > Let us see what David thinks about it. > > > > I'd hope we'd be able to get rid of the _normal stuff completely, it's seems > > way to specialized. > > > > We added that in > > > > commit b9d5ab2562eceeada5e4837a621b6260574dd11d > > Author: Lai Jiangshan > > Date: Tue Dec 11 16:01:05 2012 -0800 > > > > slub, hotplug: ignore unrelated node's hot-adding and hot-removing > > SLUB only focuses on the nodes which have normal memory and it ignores the > > other node's hot-adding and hot-removing. > > Aka: if some memory of a node which has no onlined memory is online, but > > this new memory onlined is not normal memory (for example, highmem), we > > should not allocate kmem_cache_node for SLUB. > > And if the last normal memory is offlined, but the node still has memory, > > we should remove kmem_cache_node for that node. (The current code delays > > it when all of the memory is offlined) > > So we only do something when marg->status_change_nid_normal > 0. > > marg->status_change_nid is not suitable here. > > The same problem doesn't exist in SLAB, because SLAB allocates kmem_list3 > > for every node even the node don't have normal memory, SLAB tolerates > > kmem_list3 on alien nodes. SLUB only focuses on the nodes which have > > normal memory, it don't tolerate alien kmem_cache_node. The patch makes > > SLUB become self-compatible and avoids WARNs and BUGs in rare conditions. > > > > > > How "bad" would it be if we do the slab_mem_going_online_callback() etc even > > for completely-movable nodes? I assume one kmem_cache_alloc() per slab_caches. > > > > slab_mem_going_offline_callback() only does shrinking, #dontcare > > > > Looking at slab_mem_offline_callback(), we never even free the caches either > > way when offlining. So the implication would be that we would have movable-only nodes > > set in slab_nodes. > > > > > > We don't expect many such nodes, so ... do we care? > > BTW, isn't description of slab_nodes wrong? > > "Tracks for which NUMA nodes we have kmem_cache_nodes allocated." -- but as > there is no freeing done in slab_mem_offline_callback(), isn't it always > kept allocated? It was, but not anymore :) I think this patch series [1] forgot the fact that it changed the meaning from 'NUMA nodes that have kmem_cache_node', to 'NUMA nodes that have normal memory (that can be allocated as slab memory)'? [1] https://lore.kernel.org/all/20210113131634.3671-1-vbabka@suse.cz > > (probably I am missing something) > > -- > Cheers, > > David / dhildenb > > -- Cheers, Harry (formerly known as Hyeonggon)