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SubjectRe: [tip:sched/numa] sched/numa: Introduce sys_numa_{t,m}bind()
On Mon, 21 May 2012, Ingo Molnar wrote:

> Fundamentally, do people agree with the 'single home node'
> approach to begin with? We could turn it into a node mask,
> but that complicates things.
>

I merged core/rcu locally to get a kernel that builds but ran into a
divide by zero:

[ 0.602181] divide error: 0000 [#1] SMP
[ 0.606159] CPU 0
[ 0.608003] Modules linked in:
[ 0.611266]
[ 0.612767] Pid: 1, comm: swapper/0 Not tainted 3.4.0 #1
[ 0.620912] RIP: 0010:[<ffffffff810af9ab>] [<ffffffff810af9ab>] update_sd_lb_stats+0x38b/0x740
[ 0.629630] RSP: 0018:ffff880275471870 EFLAGS: 00010056
[ 0.634927] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 0.642042] RDX: 0000000000000000 RSI: ffff880475969ca0 RDI: 0000000000000000
[ 0.649181] RBP: ffff880275471970 R08: ffff88027545ff60 R09: 0000000000000000
[ 0.656294] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000020
[ 0.663419] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 0.670559] FS: 0000000000000000(0000) GS:ffff88027fc00000(0000) knlGS:0000000000000000
[ 0.678633] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 0.684364] CR2: 0000000000000000 CR3: 000000000180b000 CR4: 00000000000007f0
[ 0.691499] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.698628] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 0.705755] Process swapper/0 (pid: 1, threadinfo ffff880275470000, task ffff88027545b800)
[ 0.714001] Stack:
[ 0.716021] 000000000000000b 0000000000012000 0000000000000000 ffff88087fd92000
[ 0.723455] ffff880275471b5c 00000000754718b8 fffffffffffffff8 ffff880275471ab0
[ 0.730884] 00000000003f5e37 00000000ffffffff ffff880275471988 ffff88027545ff60
[ 0.738320] Call Trace:
[ 0.740772] [<ffffffff810afda5>] find_busiest_group+0x45/0x480
[ 0.746692] [<ffffffff810b02da>] load_balance+0xfa/0x6e0
[ 0.752084] [<ffffffff810ae820>] ? active_load_balance_cpu_stop+0x1d0/0x1d0
[ 0.759127] [<ffffffff810b0c7c>] idle_balance+0xcc/0x130
[ 0.764529] [<ffffffff81530686>] __schedule+0x756/0x760
[ 0.769829] [<ffffffff81530749>] schedule+0x29/0x70
[ 0.774795] [<ffffffff8152ee45>] schedule_timeout+0x1b5/0x2e0
[ 0.780623] [<ffffffff8106986e>] ? physflat_send_IPI_mask+0xe/0x10
[ 0.786885] [<ffffffff810655e6>] ? native_smp_send_reschedule+0x46/0x60
[ 0.793584] [<ffffffff810a6fd0>] ? resched_task+0x60/0x70
[ 0.799052] [<ffffffff810a7565>] ? check_preempt_curr+0x75/0xa0
[ 0.805051] [<ffffffff8152fdb6>] wait_for_common+0xc6/0x160
[ 0.810716] [<ffffffff810aa420>] ? try_to_wake_up+0x2a0/0x2a0
[ 0.816541] [<ffffffff8152ff2d>] wait_for_completion+0x1d/0x20
[ 0.822461] [<ffffffff81099fe9>] kthread_create_on_node+0xa9/0x130
[ 0.828714] [<ffffffff8152ac86>] ? alternate_node_alloc+0x9d/0xa6
[ 0.834890] [<ffffffff81093cd0>] ? worker_maybe_bind_and_lock.isra.27+0xd0/0xd0
[ 0.842266] [<ffffffff81160201>] ? kmem_freepages.isra.41+0x91/0x150
[ 0.848701] [<ffffffff81095d2d>] __alloc_workqueue_key+0x1dd/0x3f0
[ 0.854963] [<ffffffff818c7d26>] ? sched_init_smp+0x300/0x30f
[ 0.860787] [<ffffffff818c9891>] cpuset_init_smp+0x40/0x50
[ 0.866356] [<ffffffff818b2c49>] kernel_init+0xb9/0x1ad
[ 0.871662] [<ffffffff8153a0d4>] kernel_thread_helper+0x4/0x10
[ 0.877573] [<ffffffff818b2b90>] ? start_kernel+0x37e/0x37e
[ 0.883216] [<ffffffff8153a0d0>] ? gs_change+0xb/0xb


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