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dc1829a4c3
kernel_optimize_test/arch/x86_64/kernel
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Ingo Molnar dc1829a4c3 [PATCH] i386/x86_64: ACPI cpu_idle_wait() fix 
The scheduler on Andreas Friedrich's hyperthreading system stopped
working properly: the scheduler would never move tasks to another CPU!
The lask known working kernel was 2.6.8.

After a couple of attempts to corner the bug, the following smoking gun
was found:

  BIOS reported wrong ACPI idfor the processor
  CPU#1: set_cpus_allowed(), swapper:1, 3 -> 2
   [<c0103bbe>] show_trace_log_lvl+0x34/0x4a
   [<c0103ceb>] show_trace+0x2c/0x2e
   [<c01045f8>] dump_stack+0x2b/0x2d
   [<c0116a77>] set_cpus_allowed+0x52/0xec
   [<c0101d86>] cpu_idle_wait+0x2e/0x100
   [<c0259c57>] acpi_processor_power_exit+0x45/0x58
   [<c0259752>] acpi_processor_remove+0x46/0xea
   [<c025c6fb>] acpi_start_single_object+0x47/0x54
   [<c025cee5>] acpi_bus_register_driver+0xa4/0xd3
   [<c04ab2d7>] acpi_processor_init+0x57/0x77
   [<c01004d7>] init+0x146/0x2fd
   [<c0103a87>] kernel_thread_helper+0x7/0x10

a quick look at cpu_idle_wait() shows how broken that code is
on i386: it changes the init task's affinity map but never
restores it ...

and because all userspace tasks get forked by init, they all
inherited that single-CPU affinity mask. x86_64 cloned this
bug too.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andreas Friedrich <andreas.friedrich@fujitsu-siemens.com>
Cc: Wolfgang Erig <Wolfgang.Erig@fujitsu-siemens.com>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-11-17 08:20:09 -08:00
..
acpi Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
cpufreq Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
aperture.c [PATCH] x86: Allow disabling early pci scans with pci=noearly or disallowing conf1 2006-09-26 10:52:41 +02:00
apic.c [PATCH] x86_64 irq_regs fix 2006-10-06 13:36:52 -07:00
asm-offsets.c [CRYPTO] all: Pass tfm instead of ctx to algorithms 2006-06-26 17:34:39 +10:00
audit.c [PATCH] audit: AUDIT_PERM support 2006-09-11 13:32:30 -04:00
crash_dump.c [PATCH] kdump: read previous kernel's memory 2006-01-10 08:01:28 -08:00
crash.c [PATCH] Remove all ifdefs for local/io apic 2006-09-26 10:52:29 +02:00
e820.c [PATCH] x86-64: setup saved_max_pfn correctly (kdump) 2006-11-14 16:57:46 +01:00
early_printk.c [PATCH] Convert x86-64 to early param 2006-09-26 10:52:32 +02:00
early-quirks.c [PATCH] x86: Add acpi_user_timer_override option for Asus boards 2006-11-14 16:57:46 +01:00
entry.S [PATCH] x86: Revert new unwind kernel stack termination 2006-10-21 18:37:02 +02:00
functionlist [NET]: make skb_release_data() static 2006-06-29 16:58:30 -07:00
genapic_cluster.c [PATCH] x86_64 irq: Allocate a vector across all cpus for genapic_flat. 2006-10-08 12:24:02 -07:00
genapic_flat.c [PATCH] x86-64: Put more than one cpu in TARGET_CPUS 2006-10-21 18:37:02 +02:00
genapic.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head64.c [PATCH] Remove need for early lockdep init 2006-09-26 10:52:32 +02:00
head.S [PATCH] Reload CS when startup_64 is used. 2006-09-26 10:52:38 +02:00
i387.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
i8259.c [PATCH] genirq: clean up irq-flow-type naming 2006-10-17 08:18:45 -07:00
init_task.c [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c 2006-10-02 07:57:20 -07:00
io_apic.c [PATCH] Use delayed disable mode of ioapic edge triggered interrupts 2006-11-15 09:04:32 -08:00
ioport.c [PATCH] x86-64 TIF flags for debug regs and io bitmap in ctxsw 2006-09-26 10:52:28 +02:00
irq.c [PATCH] genirq: clean up irq-flow-type naming 2006-10-17 08:18:45 -07:00
k8.c [PATCH] x86_64: Clean and enhance up K8 northbridge access code 2006-06-26 10:48:15 -07:00
kprobes.c [PATCH] kretprobe spinlock deadlock patch 2006-10-02 07:57:16 -07:00
ldt.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
machine_kexec.c [PATCH] Avoid overwriting the current pgd (V4, x86_64) 2006-09-26 10:52:38 +02:00
Makefile [PATCH] x86: Refactor thermal throttle processing 2006-09-26 10:52:42 +02:00
mce_amd.c [PATCH] cpu hotplug: use hotplug version of registration in late inits 2006-07-31 13:28:39 -07:00
mce_intel.c [PATCH] x86: Add a cumulative thermal throttle event counter. 2006-09-26 10:52:42 +02:00
mce.c [PATCH] x86: Refactor thermal throttle processing 2006-09-26 10:52:42 +02:00
module.c [PATCH] x86_64: x86_64 version of the smp alternative patch. 2006-06-26 10:48:14 -07:00
mpparse.c [PATCH] genirq: x86_64 irq: Kill irq compression 2006-10-04 07:55:29 -07:00
nmi.c [PATCH] x86: Clean up x86 NMI sysctls 2006-09-30 01:47:55 +02:00
pci-calgary.c [PATCH] x86-64: increase PHB1 split transaction timeout 2006-10-22 00:41:15 +02:00
pci-dma.c [PATCH] Document iommu=panic 2006-09-30 01:47:55 +02:00
pci-gart.c [PATCH] remove superflous BUG_ON's in nommu and gart 2006-09-26 10:52:32 +02:00
pci-nommu.c [PATCH] remove superflous BUG_ON's in nommu and gart 2006-09-26 10:52:32 +02:00
pci-swiotlb.c [PATCH] Move valid_dma_direction() from x86_64 to generic code 2006-09-29 09:18:10 -07:00
pmtimer.c [PATCH] make pmtmr_ioport __read_mostly 2006-06-26 09:58:21 -07:00
process.c [PATCH] i386/x86_64: ACPI cpu_idle_wait() fix 2006-11-17 08:20:09 -08:00
ptrace.c [PATCH] i386/x86-64: rename is_at_popf(), add iret to tests and fix 2006-09-26 10:52:33 +02:00
reboot.c [PATCH] x86_64: Move export symbols to their C functions 2006-06-26 10:48:22 -07:00
relocate_kernel.S [PATCH] Avoid overwriting the current pgd (V4, x86_64) 2006-09-26 10:52:38 +02:00
setup64.c [PATCH] Don't leak NT bit into next task 2006-09-26 10:52:41 +02:00
setup.c [PATCH] Use ARRAY_SIZE in setup.c 2006-09-30 01:47:55 +02:00
signal.c [PATCH] Remove all traces of signal number conversion 2006-09-26 10:52:41 +02:00
smp.c [PATCH] x86-64: Fix vgetcpu when CONFIG_HOTPLUG_CPU is disabled 2006-11-14 16:57:46 +01:00
smpboot.c [PATCH] x86-64: Only look at per_cpu data for online cpus. 2006-10-25 01:00:23 +02:00
stacktrace.c [PATCH] Merge stacktrace and show_trace 2006-09-26 10:52:34 +02:00
suspend_asm.S [PATCH] Change the name of pagedir_nosave 2006-09-26 08:49:01 -07:00
suspend.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
sys_x86_64.c [PATCH] namespaces: utsname: switch to using uts namespaces 2006-10-02 07:57:21 -07:00
syscall.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tce.c Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
time.c [PATCH] x86-64: Fix vgetcpu when CONFIG_HOTPLUG_CPU is disabled 2006-11-14 16:57:46 +01:00
trampoline.S [PATCH] Fix gdt table size in trampoline.S 2006-09-26 10:52:32 +02:00
traps.c [PATCH] x86_64: stack unwinder crash fix 2006-11-17 08:20:09 -08:00
vmlinux.lds.S [PATCH] vmlinux.lds: consolidate initcall sections 2006-10-27 15:34:51 -07:00
vsmp.c [PATCH] Fix build breakage with CONFIG_X86_VSMP 2006-10-12 12:25:27 -07:00
vsyscall.c [PATCH] x86-64: Fix vsyscall.c compilation on UP 2006-11-16 13:57:03 -08:00
x8664_ksyms.c Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00