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Andreas Herrmann 5a925b4282 x86, sched: Workaround broken sched domain creation for AMD Magny-Cours ... Current sched domain creation code can't handle multi-node processors. When switching to power_savings scheduling errors show up and system might hang later on (due to broken sched domain hierarchy): # echo 0 >> /sys/devices/system/cpu/sched_mc_power_savings CPU0 attaching sched-domain: domain 0: span 0-5 level MC groups: 0 1 2 3 4 5 domain 1: span 0-23 level NODE groups: 0-5 6-11 18-23 12-17 ... # echo 1 >> /sys/devices/system/cpu/sched_mc_power_savings CPU0 attaching sched-domain: domain 0: span 0-11 level MC groups: 0 1 2 3 4 5 6 7 8 9 10 11 ERROR: parent span is not a superset of domain->span domain 1: span 0-5 level CPU ERROR: domain->groups does not contain CPU0 groups: 6-11 (__cpu_power = 12288) ERROR: groups don't span domain->span domain 2: span 0-23 level NODE groups: ERROR: domain->cpu_power not set ERROR: groups don't span domain->span ... Fixing all aspects of power-savings scheduling for Magny-Cours needs some larger changes in the sched domain creation code. As a short-term and temporary workaround avoid the problems by extending "the worst possible hack" ;-( and always use llc_shared_map on AMD Magny-Cours when MC domain span is calculated. With this I get: # echo 1 >> /sys/devices/system/cpu/sched_mc_power_savings CPU0 attaching sched-domain: domain 0: span 0-5 level MC groups: 0 1 2 3 4 5 domain 1: span 0-5 level CPU groups: 0-5 (__cpu_power = 6144) domain 2: span 0-23 level NODE groups: 0-5 (__cpu_power = 6144) 6-11 (__cpu_power = 6144) 18-23 (__cpu_power = 6144) 12-17 (__cpu_power = 6144) ... I.e. no errors during sched domain creation, no system hangs, and also mc_power_savings scheduling works to a certain extend. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>		16 years ago
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boot	x86: fix usage of bios intcall()	16 years ago
configs	…
crypto	x86: Move kernel_fpu_using to irq_fpu_usable in asm/i387.h	16 years ago
ia32	…
include/asm	x86: Fix CPU llc_shared_map information for AMD Magny-Cours	16 years ago
kernel	x86, sched: Workaround broken sched domain creation for AMD Magny-Cours	16 years ago
kvm	KVM: MMU: limit rmap chain length	16 years ago
lguest	lguest: update commentry	16 years ago
lib	x86, msr: Fix msr-reg.S compilation with gas 2.16.1, on 32-bit too	16 years ago
math-emu	…
mm	x86: don't call '->send_IPI_mask()' with an empty mask	16 years ago
oprofile	x86/oprofile: rename kernel parameter for architectural perfmon to arch_perfmon	16 years ago
pci	x86/pci: insert ioapic resource before assigning unassigned resources	16 years ago
power	x86: Fix resume from suspend when CONFIG_CC_STACKPROTECTOR	16 years ago
vdso	gcov: enable GCOV_PROFILE_ALL for x86_64	16 years ago
video	…
xen	x86, msr: Have the _safe MSR functions return -EIO, not -EFAULT	16 years ago
Kbuild	…
Kconfig	perf_counter, x86: Fix/improve apic fallback	16 years ago
Kconfig.cpu	x86: add specific support for Intel Atom architecture	16 years ago
Kconfig.debug	…
Makefile	x86: add specific support for Intel Atom architecture	16 years ago
Makefile_32.cpu	x86: add specific support for Intel Atom architecture	16 years ago