linux-kernel - Re: Possible bug in 2.6.34 slub

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Date:	Mon, 7 Jun 2010 17:35:27 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Giangiacomo Mariotti <gg.mariotti@...il.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Randy Dunlap <rdunlap@...otime.net>,
	Bill Davidsen <davidsen@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86 maintainers <x86@...nel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: Possible bug in 2.6.34 slub

On Fri, 4 Jun 2010, Giangiacomo Mariotti wrote:

> [    0.000000] found SMP MP-table at [ffff8800000f5ed0] f5ed0

SMP table is important.

> [    0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x02] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x04] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x06] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x01] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x03] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x05] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x08] lapic_id[0x08] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x09] lapic_id[0x09] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x0a] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x0b] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x0c] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x0d] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x0e] disabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x0f] disabled)
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x03] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x04] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x05] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x06] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x07] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x08] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x09] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0a] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0b] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0c] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0d] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0e] dfl dfl lint[0x1])
> [    0.000000] ACPI: LAPIC_NMI (acpi_id[0x0f] dfl dfl lint[0x1])
> [    0.000000] ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
> [    0.000000] IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
> [    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
> [    0.000000] ACPI: IRQ0 used by override.
> [    0.000000] ACPI: IRQ2 used by override.
> [    0.000000] ACPI: IRQ9 used by override.
> [    0.000000] Using ACPI (MADT) for SMP configuration information
> [    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
> [    0.000000] SMP: Allowing 16 CPUs, 8 hotplug CPUs

ok so 24 cpus. 8 hotplug which should not work.

> dff00000:14100000)
> [    0.000000] setup_percpu: NR_CPUS:512 nr_cpumask_bits:512
> nr_cpu_ids:16 nr_node_ids:1

And it only has 16 now.

> [    0.000000] SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0,
> CPUs=16, Nodes=1

And slub displays nr_cpu_ids again.

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