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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 Wed, Jul 02, 2025 at 09:30:30AM +0200, Vlastimil Babka wrote: > +CC xfs and few more >=20 > On 7/2/25 3:41 AM, Tetsuo Handa wrote: > > On 2025/07/02 0:01, Zi Yan wrote: > >>> __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:4972 > >>> alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 > >>> alloc_slab_page mm/slub.c:2451 [inline] > >>> allocate_slab+0xe2/0x3b0 mm/slub.c:2627 > >>> new_slab mm/slub.c:2673 [inline] > >> > >> new_slab() allows __GFP_NOFAIL, since GFP_RECLAIM_MASK has it. > >> In allocate_slab(), the first allocation without __GFP_NOFAIL > >> failed, the retry used __GFP_NOFAIL but kmem_cache order > >> was greater than 1, which led to the warning above. > >> > >> Maybe allocate_slab() should just fail when kmem_cache > >> order is too big and first trial fails? I am no expert, > >> so add Vlastimil for help. >=20 > Thanks Zi. Slab shouldn't fail with __GFP_NOFAIL, that would only lead > to subsystems like xfs to reintroduce their own forever retrying > wrappers again. I think it's going the best it can for the fallback > attempt by using the minimum order, so the warning will never happen due > to the calculated optimal order being too large, but only if the > kmalloc()/kmem_cache_alloc() requested/object size is too large itself. Right. The warning would trigger only if the object size is bigger than 8k (PAGE_SIZE * 2). > Hm but perhaps enabling slab_debug can inflate it over the threshold, is > it the case here? CONFIG_CMDLINE=3D"earlyprintk=3Dserial net.ifnames=3D0 sysctl.kernel.hung_t= ask_all_cpu_backtrace=3D1 ima_policy=3Dtcb nf-conntrack-ftp.ports=3D20000 n= f-conntrack-tftp.ports=3D20000 nf-conntrack-sip.ports=3D20000 nf-conntrack-= irc.ports=3D20000 nf-conntrack-sane.ports=3D20000 binder.debug_mask=3D0 rcu= pdate.rcu_expedited=3D1 rcupdate.rcu_cpu_stall_cputime=3D1 no_hash_pointers= page_owner=3Don sysctl.vm.nr_hugepages=3D4 sysctl.vm.nr_overcommit_hugepag= es=3D4 secretmem.enable=3D1 sysctl.max_rcu_stall_to_panic=3D1 msr.allow_wri= tes=3Doff coredump_filter=3D0xffff root=3D/dev/sda console=3DttyS0 vsyscall= =3Dnative numa=3Dfake=3D2 kvm-intel.nested=3D1 spec_store_bypass_disable=3D= prctl nopcid vivid.n_devs=3D64 vivid.multiplanar=3D1,2,1,2,1,2,1,2,1,2,1,2,= 1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2= ,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=3D32 rose.rose_ndevs=3D32 smp.= csd_lock_timeout=3D100000 watchdog_thresh=3D55 workqueue.watchdog_thresh=3D= 140 sysctl.net.core.netdev_unregister_timeout_secs=3D140 dummy_hcd.num=3D32= max_loop=3D32 nbds_max=3D32 panic_on_warn=3D1" CONFIG_SLUB_DEBUG=3Dy # CONFIG_SLUB_DEBUG_ON is not set It seems no slab_debug is involved here. I downloaded the config and built the kernel, and sizeof(struct xfs_mount) is 4480 bytes. It should have allocated using order 1? Not sure why the min order was greater than 1? Not sure what I'm missing... > I think in that rare case we could convert such > fallback allocations to large kmalloc to avoid adding the debugging > overhead - we can't easily create an individual slab page without the > debugging layout for a kmalloc cache with debugging enabled. Yeah that can be doable when the size is exactly 8k or very close to 8k. --=20 Cheers, Harry / Hyeonggon