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    SubjectRe: [PATCH 0/2] NR_CPUS: increase maximum NR_CPUS to 4096
    Yinghai Lu wrote:
    > On Fri, Apr 4, 2008 at 6:30 PM, Mike Travis <travis@sgi.com> wrote:
    >> * Increases the limit of NR_CPUS to 4096 and introduces a
    >> boolean called "MAXSMP" which when set (e.g. "allyesconfig")
    >> will set NR_CPUS = 4096 and NODES_SHIFT = 9 (512).
    >>
    >> I've been running this config (4k NR_CPUS, 512 Max Nodes)
    >> on an AMD box with 2 dual-cores and 4gb memory as well as an
    >> Intel box with 4 single-core cpus and 8Mb. I've also
    >> successfully booted it in a simulated 2cpus/1Gb environment.
    >>
    >> Based on:
    >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
    >> + x86/latest .../x86/linux-2.6-x86.git
    >> + sched-devel/latest .../mingo/linux-2.6-sched-devel.git
    >>
    >> Signed-off-by: Mike Travis <travis@sgi.com>
    >
    > got

    Hi Yinghai,

    Thanks for the feedback! Would you send me your config file and
    other details (like cpu type/mem size/etc.) and I'll attempt
    to reproduce the failure.

    (My problem is that only the AMD box is a real "workstation", the
    Intel box is a dual quad-cpu server so it's really deficient in I/O.)

    Thanks,
    Mike
    >
    > ------------[ cut here ]------------
    > WARNING: at kernel/sched_fair.c:815 hrtick_start_fair+0x69/0x156()
    > Modules linked in:
    > Pid: 1, comm: swapper Not tainted
    > 2.6.25-rc8-x86-latest.git-smp-01033-ga39ae31-dirty #77
    >
    > Call Trace:
    > [<ffffffff802596ce>] warn_on_slowpath+0x67/0x8e
    > [<ffffffff8024b266>] hrtick_start_fair+0x69/0x156
    > [<ffffffff8024a619>] ? dequeue_entity+0x2a/0xf8
    > [<ffffffff8025547d>] dequeue_task_fair+0x5f/0x7e
    > [<ffffffff80248ea3>] dequeue_task+0x22/0x44
    > [<ffffffff80248efe>] deactivate_task+0x39/0x69
    > [<ffffffff80a57c31>] schedule+0x1b9/0x5c5
    > [<ffffffff80270dff>] ? autoremove_wake_function+0x20/0x5e
    > [<ffffffff80a58338>] schedule_timeout+0x31/0xd7
    > [<ffffffff8024db1a>] ? __wake_up+0x52/0x75
    > [<ffffffff80a578a3>] wait_for_common+0x103/0x189
    > [<ffffffff8024f29b>] ? default_wake_function+0x0/0x36
    > [<ffffffff80a57a62>] wait_for_completion+0x2b/0x41
    > [<ffffffff8026c0d2>] call_usermodehelper_exec+0x87/0xe5
    > [<ffffffff80561073>] kobject_uevent_env+0x3d0/0x424
    > [<ffffffff805610e5>] kobject_uevent+0x1e/0x34
    > [<ffffffff805f2dbd>] device_add+0x2f9/0x494
    > [<ffffffff805f2f80>] device_register+0x28/0x43
    > [<ffffffff80577abf>] pcie_port_device_register+0x3f1/0x43e
    > [<ffffffff80972165>] ? pcibios_set_master+0x8d/0xa8
    > [<ffffffff80a24a1c>] pcie_portdrv_probe+0x79/0xbb
    > [<ffffffff80574173>] pci_call_probe+0xe5/0x146
    > [<ffffffff80574331>] pci_device_probe+0x64/0xa2
    > [<ffffffff805f5946>] driver_probe_device+0xcf/0x16d
    > [<ffffffff8031d708>] ? sysfs_addrm_finish+0x2f/0x22b
    > [<ffffffff805f5b0b>] ? __driver_attach+0x0/0xbe
    > [<ffffffff805f5b79>] __driver_attach+0x6e/0xbe
    > [<ffffffff805f4999>] bus_for_each_dev+0x5e/0xa2
    > [<ffffffff805f571f>] driver_attach+0x2f/0x45
    > [<ffffffff805f5430>] bus_add_driver+0xc6/0x226
    > [<ffffffff805f45a4>] ? bus_put+0x29/0x3f
    > [<ffffffff805f5e66>] driver_register+0x6d/0xfc
    > [<ffffffff805745fa>] __pci_register_driver+0x62/0xb0
    > [<ffffffff818b25db>] pcie_portdrv_init+0x4a/0x72
    > [<ffffffff81890bcf>] kernel_init+0x1b4/0x340
    > [<ffffffff80225308>] child_rip+0xa/0x12
    > [<ffffffff81890a1b>] ? kernel_init+0x0/0x340
    > [<ffffffff802252fe>] ? child_rip+0x0/0x12
    >
    > ---[ end trace e26645195698f5cf ]---
    > BUG: unable to handle kernel NULL pointer dereference at 0000000000000148
    > IP: [<ffffffff8024b3cf>] pick_next_task_fair+0x7c/0xbb
    > PGD 0
    > Oops: 0000 [1] SMP
    > CPU 28
    > Modules linked in:
    > Pid: 1, comm: swapper Not tainted
    > 2.6.25-rc8-x86-latest.git-smp-01033-ga39ae31-dirty #77
    > RIP: 0010:[<ffffffff8024b3cf>] [<ffffffff8024b3cf>]
    > pick_next_task_fair+0x7c/0xbb
    > RSP: 0018:ffff81081cc5cd70 EFLAGS: 00010046
    > RAX: 0000000000000000 RBX: ffff81383c21a280 RCX: 0000000000000000
    > RDX: ffff81383c224080 RSI: ffff81383c224080 RDI: 0000000063e15417
    > RBP: ffff81081cc5cda0 R08: 0000000000000000 R09: ffff81383c224108
    > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
    > R13: ffff81383c224080 R14: ffff81383c224080 R15: 000000000000001c
    > FS: 0000000000000000(0000) GS:ffff81401cc3c600(0000) knlGS:0000000000000000
    > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > CR2: 0000000000000148 CR3: 0000000000201000 CR4: 00000000000006e0
    > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Process swapper (pid: 1, threadinfo ffff81081cc5c000, task ffff81401cc52000)
    > Stack: ffff81081cc5cda0 0000000063e15417 ffffffff80a81840 0000000000000000
    > 00000000fffeecfd ffff81383c224080 ffff81081cc5ce70 ffffffff80a57d28
    > ffff81081cc5ce00 ffff81081cc5ce20 ffffffff81963080 ffffffff81963080
    > Call Trace:
    > [<ffffffff80a57d28>] schedule+0x2b0/0x5c5
    > [<ffffffff80270dff>] ? autoremove_wake_function+0x20/0x5e
    > [<ffffffff80a58338>] schedule_timeout+0x31/0xd7
    > [<ffffffff8024db1a>] ? __wake_up+0x52/0x75
    > [<ffffffff80a578a3>] wait_for_common+0x103/0x189
    > [<ffffffff8024f29b>] ? default_wake_function+0x0/0x36
    > [<ffffffff80a57a62>] wait_for_completion+0x2b/0x41
    > [<ffffffff8026c0d2>] call_usermodehelper_exec+0x87/0xe5
    > [<ffffffff80561073>] kobject_uevent_env+0x3d0/0x424
    > [<ffffffff805610e5>] kobject_uevent+0x1e/0x34
    > [<ffffffff805f2dbd>] device_add+0x2f9/0x494
    > [<ffffffff805f2f80>] device_register+0x28/0x43
    > [<ffffffff80577abf>] pcie_port_device_register+0x3f1/0x43e
    > [<ffffffff80972165>] ? pcibios_set_master+0x8d/0xa8
    > [<ffffffff80a24a1c>] pcie_portdrv_probe+0x79/0xbb
    > [<ffffffff80574173>] pci_call_probe+0xe5/0x146
    > [<ffffffff80574331>] pci_device_probe+0x64/0xa2
    > [<ffffffff805f5946>] driver_probe_device+0xcf/0x16d
    > [<ffffffff8031d708>] ? sysfs_addrm_finish+0x2f/0x22b
    > [<ffffffff805f5b0b>] ? __driver_attach+0x0/0xbe
    > [<ffffffff805f5b79>] __driver_attach+0x6e/0xbe
    > [<ffffffff805f4999>] bus_for_each_dev+0x5e/0xa2
    > [<ffffffff805f571f>] driver_attach+0x2f/0x45
    > [<ffffffff805f5430>] bus_add_driver+0xc6/0x226
    > [<ffffffff805f45a4>] ? bus_put+0x29/0x3f
    > [<ffffffff805f5e66>] driver_register+0x6d/0xfc
    > [<ffffffff805745fa>] __pci_register_driver+0x62/0xb0
    > [<ffffffff818b25db>] pcie_portdrv_init+0x4a/0x72
    > [<ffffffff81890bcf>] kernel_init+0x1b4/0x340
    > [<ffffffff80225308>] child_rip+0xa/0x12
    > [<ffffffff81890a1b>] ? kernel_init+0x0/0x340
    > [<ffffffff802252fe>] ? child_rip+0x0/0x12
    >
    >
    > Code: 24 40 78 1c 8b 3d 36 05 b3 00 48 89 da be 00 04 00 00 e8 7a eb
    > ff ff 49 39 c6 7f 04 4c 8b 63 48 4c 89 e6 4
    > 8 89 df e8 29 f1 ff ff <49> 8b 9c 24 48 01 00 00 48 85 db 75 a5 49 8d
    > 5c 24 c8 4c 89 ef
    > RIP [<ffffffff8024b3cf>] pick_next_task_fair+0x7c/0xbb
    > RSP <ffff81081cc5cd70>
    > CR2: 0000000000000148
    > ---[ end trace e26645195698f5cf ]---



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