On Thu, 1 Jun 2017, Christoph Lameter wrote: > > > > I am curious as to what is going on there. Do you have the output from > > > these failed allocations? > > > > I thought the relevant output was in my mail. I did skip the Mem-Info > > dump, since that just seemed noise in this case: we know memory can get > > fragmented. What more output are you looking for? > > The output for the failing allocations when you disabling debugging. For > that I would think that you need remove(!) the slub_debug statement on the kernel > command line. You can verify that debug is off by inspecting the values in > /sys/kernel/slab/<yourcache>/<debug option> The output was with debugging disabled. Except when I tried adding that slub_debug=O on the kernel command line, as the warning suggested, I did not have any slub_debug statement on the command line; and did not have CONFIG_SLUB_DEBUG_ON=y. My SLAB|SLUB config options are CONFIG_SLUB_DEBUG=y # CONFIG_SLUB_MEMCG_SYSFS_ON is not set # CONFIG_SLAB is not set CONFIG_SLUB=y # CONFIG_SLAB_FREELIST_RANDOM is not set CONFIG_SLUB_CPU_PARTIAL=y CONFIG_SLABINFO=y # CONFIG_SLUB_DEBUG_ON is not set CONFIG_SLUB_STATS=y > > > But it was still order 4 when booted with slub_debug=O, which surprised me. > > And that surprises you too? If so, then we ought to dig into it further. > > No it does no longer. I dont think slub_debug=O does disable debugging > (frankly I am not sure what it does). Please do not specify any debug options. But I think you are now surprised, when I say no slub_debug options were on. Here's the output from /sys/kernel/slab/pgtable-2^12/* (before I tried the new kernel with Aneesh's fix patch) in case they tell you anything... pgtable-2^12/aliases:0 pgtable-2^12/align:32768 grep: pgtable-2^12/alloc_calls: Function not implemented pgtable-2^12/alloc_fastpath:5847 C0=1587 C1=1449 C2=1392 C3=1419 pgtable-2^12/alloc_from_partial:12637 C0=3292 C1=3020 C2=3051 C3=3274 pgtable-2^12/alloc_node_mismatch:0 pgtable-2^12/alloc_refill:41038 C0=10600 C1=10025 C2=10191 C3=10222 pgtable-2^12/alloc_slab:517 C0=148 C1=110 C2=105 C3=154 pgtable-2^12/alloc_slowpath:54203 C0=14041 C1=13157 C2=13349 C3=13656 pgtable-2^12/cache_dma:0 pgtable-2^12/cmpxchg_double_cpu_fail:0 pgtable-2^12/cmpxchg_double_fail:0 pgtable-2^12/cpu_partial:2 pgtable-2^12/cpu_partial_alloc:25894 C0=6719 C1=6334 C2=6288 C3=6553 pgtable-2^12/cpu_partial_drain:8441 C0=2035 C1=2211 C2=2268 C3=1927 pgtable-2^12/cpu_partial_free:38987 C0=9642 C1=10042 C2=10132 C3=9171 pgtable-2^12/cpu_partial_node:12237 C0=3183 C1=2928 C2=2961 C3=3165 pgtable-2^12/cpu_slabs:11 pgtable-2^12/cpuslab_flush:17 C0=5 C2=4 C3=8 pgtable-2^12/ctor:pgd_ctor+0x0/0x18 pgtable-2^12/deactivate_bypass:39027 C0=10153 C1=9463 C2=9439 C3=9972 pgtable-2^12/deactivate_empty:446 C0=98 C1=118 C2=123 C3=107 pgtable-2^12/deactivate_full:16 C0=5 C2=3 C3=8 pgtable-2^12/deactivate_remote_frees:0 pgtable-2^12/deactivate_to_head:1 C2=1 pgtable-2^12/deactivate_to_tail:0 pgtable-2^12/destroy_by_rcu:0 pgtable-2^12/free_add_partial:24877 C0=6007 C1=6515 C2=6681 C3=5674 grep: pgtable-2^12/free_calls: Function not implemented pgtable-2^12/free_fastpath:5849 C0=1587 C1=1449 C2=1394 C3=1419 pgtable-2^12/free_frozen:15145 C0=3989 C1=3701 C2=3683 C3=3772 pgtable-2^12/free_remove_partial:0 pgtable-2^12/free_slab:446 C0=98 C1=118 C2=123 C3=107 pgtable-2^12/free_slowpath:54132 C0=13631 C1=13743 C2=13815 C3=12943 pgtable-2^12/hwcache_align:0 pgtable-2^12/min_partial:8 pgtable-2^12/object_size:32768 pgtable-2^12/objects:67 pgtable-2^12/objects_partial:0 pgtable-2^12/objs_per_slab:1 pgtable-2^12/order:4 pgtable-2^12/order_fallback:13 C0=2 C1=1 C2=5 C3=5 pgtable-2^12/partial:4 pgtable-2^12/poison:0 pgtable-2^12/reclaim_account:0 pgtable-2^12/red_zone:0 pgtable-2^12/reserved:0 pgtable-2^12/sanity_checks:0 pgtable-2^12/slab_size:65536 pgtable-2^12/slabs:71 pgtable-2^12/slabs_cpu_partial:7(7) C0=1(1) C1=3(3) C2=1(1) C3=2(2) pgtable-2^12/store_user:0 pgtable-2^12/total_objects:71 pgtable-2^12/trace:0 Hugh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
