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Jeremy Fitzhardinge 8efcbab674 paravirt: introduce a "lock-byte" spinlock implementation 
Implement a version of the old spinlock algorithm, in which everyone
spins waiting for a lock byte.  In order to be compatible with the
ticket-lock's use of a zero initializer, this uses the convention of
'0' for unlocked and '1' for locked.

This algorithm is much better than ticket locks in a virtual
envionment, because it doesn't interact badly with the vcpu scheduler.
If there are multiple vcpus spinning on a lock and the lock is
released, the next vcpu to be scheduled will take the lock, rather
than cycling around until the next ticketed vcpu gets it.

To use this, you must call paravirt_use_bytelocks() very early, before
any spinlocks have been taken.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Lameter <clameter@linux-foundation.org>
Cc: Petr Tesarik <ptesarik@suse.cz>
Cc: Virtualization <virtualization@lists.linux-foundation.org>
Cc: Xen devel <xen-devel@lists.xensource.com>
Cc: Thomas Friebel <thomas.friebel@amd.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-16 11:15:53 +02:00
..
acpi Merge branch 'linus' into x86/urgent 2008-07-15 13:45:59 +02:00
cpu x86_64: further cleanup of 32-bit compat syscall mechanisms 2008-07-16 11:08:27 +02:00
.gitignore arch/x86/kernel/.gitignore: Added vmlinux.lds to .gitignore file because it shouldn't be tracked. 2008-07-10 10:13:51 -07:00
alternative.c x86: fix SMP alternatives: use mutex instead of spinlock, text_poke is sleepable 2008-05-23 21:56:52 +02:00
amd_iommu_init.c x86, AMD IOMMU: remove unnecessary code from the iommu_enable function 2008-07-04 11:44:44 +02:00
amd_iommu.c x86, AMD IOMMU: flush domain TLB when there is more than one page to flush 2008-07-04 11:44:40 +02:00
aperture_64.c x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
apic_32.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
apic_64.c x86: nmi_watchdog - use NMI_NONE by default 2008-07-08 12:51:41 +02:00
apm_32.c Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6 2008-07-14 14:48:31 -07:00
asm-offsets_32.c x86/paravirt: split sysret and sysexit 2008-07-08 13:13:15 +02:00
asm-offsets_64.c xen64: add asm-offsets 2008-07-16 10:58:55 +02:00
asm-offsets.c
audit_64.c
bootflag.c
cpuid.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
crash_dump_32.c
crash_dump_64.c
crash.c
doublefault_32.c
ds.c
e820.c x86, e820: remove end_user_pfn 2008-07-13 08:19:40 +02:00
early_printk.c x86, generic: mark early_printk as asmlinkage 2008-06-18 13:11:01 +02:00
early-quirks.c x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
efi_32.c x86: fix Intel Mac booting with EFI 2008-07-03 08:19:18 +02:00
efi_64.c x86: add flags parameter to reserve_bootmem_generic() 2008-07-08 11:49:49 +02:00
efi_stub_32.S
efi_stub_64.S
efi.c x86: introduce max_low_pfn_mapped for 64-bit 2008-07-11 10:24:04 +02:00
entry_32.S Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
entry_64.S x86_64: adjust exception frame on paranoid exceptions 2008-07-16 11:08:58 +02:00
ftrace.c ftrace: store mcount address in rec->ip 2008-06-23 22:10:56 +02:00
genapic_64.c x86: introduce max_physical_apicid for bigsmp switching 2008-06-10 11:32:09 +02:00
genapic_flat_64.c
genx2apic_uv_x.c x86: map UV chipset space - UV support 2008-07-09 07:43:23 +02:00
geode_32.c x86, geode: add a VSA2 ID for General Software 2008-06-19 14:19:03 +02:00
head32.c x86: extract common part of head32.c and head64.c into head.c 2008-06-05 15:10:02 +02:00
head64.c x86_64: add workaround for no %gs-based percpu 2008-07-16 10:58:13 +02:00
head_32.S x86: boot secondary cpus through initial_code 2008-07-08 12:48:18 +02:00
head_64.S Revert "x86_64: there's no need to preallocate level1_fixmap_pgt" 2008-07-16 11:07:30 +02:00
head.c x86: move reserve_setup_data to setup.c 2008-07-08 13:16:14 +02:00
hpet.c x86: make 64bit hpet_set_mapping to use ioremap too, v2 2008-07-14 09:24:17 +02:00
i386_ksyms_32.c ftrace: store mcount address in rec->ip 2008-06-23 22:10:56 +02:00
i387.c x86 ptrace: fix PTRACE_GETFPXREGS error 2008-07-01 11:03:31 +02:00
i8237.c
i8253.c
i8259.c i8259: fix final ugliness 2008-06-02 11:55:52 +02:00
init_task.c [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
io_apic_32.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
io_apic_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
io_delay.c
ioport.c
ipi.c x86: ipi.c: removed duplicated include 2008-05-25 08:58:32 +02:00
irq_32.c x86: use __page_aligned_data/bss 2008-07-16 10:54:39 +02:00
irq_64.c x86: make /proc/stat account for all interrupts 2008-05-25 07:11:49 +02:00
irqinit_32.c x86: rename the i8259_32/64.c leftovers to irqinit_32/64.c 2008-05-24 16:47:39 +02:00
irqinit_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
k8.c
kdebugfs.c
kgdb.c
kprobes.c
kvm.c
kvmclock.c x86: KVM guest: Use the paravirt clocksource structs and functions 2008-06-24 21:02:33 +03:00
ldt.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
machine_kexec_32.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
machine_kexec_64.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
Makefile Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
mca_32.c
mfgpt_32.c geode: fix modular build 2008-06-12 21:25:51 +02:00
microcode.c Merge branch 'for-2.6.27' of git://git.infradead.org/users/dwmw2/firmware-2.6 2008-07-14 16:54:07 -07:00
mmconf-fam10h_64.c x86: move mmconfig declarations to header 2008-05-30 15:45:17 -07:00
module_32.c
module_64.c
mpparse.c x86: add early quirk support 2008-07-10 18:55:31 +02:00
msr.c x86: cdev lock_kernel() pushdown 2008-05-18 15:43:40 -06:00
nmi.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
numaq_32.c x86: fix numaq_tsc_disable calling 2008-07-13 08:19:45 +02:00
olpc.c
paravirt_patch_32.c x86/paravirt: split sysret and sysexit 2008-07-08 13:13:15 +02:00
paravirt_patch_64.c x86/paravirt: add sysret/sysexit pvops for returning to 32-bit compatibility userspace 2008-07-08 13:15:52 +02:00
paravirt.c paravirt: introduce a "lock-byte" spinlock implementation 2008-07-16 11:15:53 +02:00
pci-calgary_64.c x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
pci-dma.c x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
pci-gart_64.c x86: max_low_pfn_mapped fix #4 2008-07-14 09:24:16 +02:00
pci-nommu.c
pci-swiotlb_64.c x86: remove end_pfn in 64bit 2008-07-08 13:10:38 +02:00
pcspeaker.c
pmtimer_64.c
probe_roms_32.c x86: seperate probe_roms into another file 2008-07-08 12:50:05 +02:00
process_32.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
process_64.c x86: clean up formatting of __switch_to 2008-07-16 10:54:25 +02:00
process.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
ptrace.c x86 ptrace: fix PTRACE_GETFPXREGS error 2008-07-01 11:03:31 +02:00
pvclock.c x86: Add structs and functions for paravirt clocksource 2008-06-24 21:02:31 +03:00
quirks.c Merge branch 'timers/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-15 10:39:57 -07:00
reboot_fixups_32.c x86: constify data in reboot.c 2008-05-25 08:58:30 +02:00
reboot.c x86: constify data in reboot.c 2008-05-25 08:58:30 +02:00
relocate_kernel_32.S
relocate_kernel_64.S
rtc.c provide rtc_cmos platform device 2008-06-12 18:05:42 -07:00
scx200_32.c
setup_percpu.c x86: change _node_to_cpumask_ptr to return const ptr 2008-07-13 19:11:58 +02:00
setup.c pvops-64: call paravirt_post_allocator_init() on setup_arch() 2008-07-16 10:53:57 +02:00
sigframe.h
signal_32.c
signal_64.c
smp.c generic-ipi: fixlet 2008-07-06 14:01:50 +02:00
smpboot.c x86_64: unstatic get_local_pda 2008-07-16 10:55:07 +02:00
smpcommon_32.c
smpcommon.c x86: convert to generic helpers for IPI function calls 2008-06-26 11:21:54 +02:00
stacktrace.c stacktrace: fix modular build, export print_stack_trace and save_stack_trace 2008-06-30 09:20:55 +02:00
step.c
summit_32.c x86: make generic arch support NUMAQ 2008-06-10 11:34:42 +02:00
sys_i386_32.c x86: coding style fixes to arch/x86/kernel/sys_i386_32.c 2008-06-10 12:34:54 +02:00
sys_x86_64.c unified (weak) sys_pipe implementation 2008-05-03 13:50:33 -07:00
syscall_64.c
syscall_table_32.S
tce_64.c
test_nx.c
test_rodata.c
time_32.c x86: merge sched_clock handling 2008-07-09 07:43:25 +02:00
time_64.c x86: merge tsc_init and clocksource code 2008-07-09 07:43:27 +02:00
tlb_32.c on_each_cpu(): kill unused 'retry' parameter 2008-06-26 11:24:38 +02:00
tlb_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
tlb_uv.c x86, SGI UV: uv_ptc_proc_write fix 2008-07-08 12:23:31 +02:00
tls.c
tls.h
topology.c
trampoline_32.S
trampoline_64.S
trampoline.c x86: extend e820 ealy_res support 32bit 2008-05-25 10:55:11 +02:00
traps_32.c x86: traps_xx: various small changes 2008-07-09 08:18:31 +02:00
traps_64.c Merge branch 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 13:43:24 -07:00
tsc_sync.c
tsc.c x86: fix TSC build error on 32bit 2008-07-15 22:46:47 +02:00
verify_cpu_64.S
visws_quirks.c x86, VisWS: build fix 2008-07-10 19:45:01 +02:00
vm86_32.c
vmi_32.c x86: rename paravirtualized TSC functions 2008-07-09 07:43:28 +02:00
vmiclock_32.c x86: rename paravirtualized TSC functions 2008-07-09 07:43:28 +02:00
vmlinux_32.lds.S Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
vmlinux_64.lds.S Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
vmlinux.lds.S
vsmp_64.c x86: vsmp_64 add missing includes 2008-05-25 08:58:24 +02:00
vsyscall_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
x8664_ksyms_64.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00