Linus Torvalds 7e16838d94 i387: support lazy restore of FPU state ... This makes us recognize when we try to restore FPU state that matches what we already have in the FPU on this CPU, and avoids the restore entirely if so. To do this, we add two new data fields: - a percpu 'fpu_owner_task' variable that gets written any time we update the "has_fpu" field, and thus acts as a kind of back-pointer to the task that owns the CPU. The exception is when we save the FPU state as part of a context switch - if the save can keep the FPU state around, we leave the 'fpu_owner_task' variable pointing at the task whose FP state still remains on the CPU. - a per-thread 'last_cpu' field, that indicates which CPU that thread used its FPU on last. We update this on every context switch (writing an invalid CPU number if the last context switch didn't leave the FPU in a lazily usable state), so we know that *that* thread has done nothing else with the FPU since. These two fields together can be used when next switching back to the task to see if the CPU still matches: if 'fpu_owner_task' matches the task we are switching to, we know that no other task (or kernel FPU usage) touched the FPU on this CPU in the meantime, and if the current CPU number matches the 'last_cpu' field, we know that this thread did no other FP work on any other CPU, so the FPU state on the CPU must match what was saved on last context switch. In that case, we can avoid the 'f[x]rstor' entirely, and just clear the CR0.TS bit. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-02-20 10:58:54 -08:00
..
numachip	x86: Add NumaChip support	2011-12-05 17:17:24 +01:00
uv	x86/uv: Fix uv_gpa_to_soc_phys_ram() shift	2012-01-26 10:58:27 +01:00
visws
xen	Merge branch 'upstream/xen-settime' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen	2011-11-06 20:15:05 -08:00
a.out-core.h
a.out.h
acpi.h
aes.h
agp.h
alternative-asm.h	x86: Fix atomic64_xxx_cx8() functions	2012-01-04 15:01:56 +01:00
alternative.h	asm alternatives: remove incorrect alignment notes	2011-09-15 13:28:33 -07:00
amd_nb.h	x86/PCI: amd: factor out MMCONFIG discovery	2012-01-06 12:11:19 -08:00
apb_timer.h
apic.h	x86, x2apic: Allow "nox2apic" to disable x2apic mode setup by BIOS	2011-12-23 11:01:43 -08:00
apic_flat_64.h	x86: Make flat_init_apic_ldr() available	2011-12-05 17:17:07 +01:00
apicdef.h	x86, x2apic: Fallback to xapic when BIOS doesn't setup interrupt-remapping	2011-12-23 11:01:01 -08:00
apm.h
arch_hweight.h
archrandom.h
asm-offsets.h
asm.h
atomic.h	x86: Use xadd helper more widely	2011-08-29 13:44:12 -07:00
atomic64_32.h	x86, atomic: atomic64_read() take a const pointer	2012-01-09 19:33:24 -08:00
atomic64_64.h	x86: Use xadd helper more widely	2011-08-29 13:44:12 -07:00
auxvec.h
bios_ebda.h
bitops.h	x86_64, asm: Optimise fls(), ffs() and fls64()	2011-12-15 15:16:49 -08:00
bitsperlong.h
boot.h
bootparam.h	x86: Add missing bzImage fields to struct setup_header	2011-12-09 17:35:33 -08:00
bug.h
bugs.h
byteorder.h
cache.h
cacheflush.h
calgary.h
calling.h
ce4100.h
checksum.h
checksum_32.h
checksum_64.h
clocksource.h
cmpxchg.h	x86: Properly parenthesize cmpxchg() macro arguments	2012-01-26 21:18:29 +01:00
cmpxchg_32.h	x86: Fix and improve cmpxchg_double{,_local}()	2012-01-04 15:01:54 +01:00
cmpxchg_64.h	x86: Fix and improve cmpxchg_double{,_local}()	2012-01-04 15:01:54 +01:00
compat.h	compat: sync compat_stats with statfs.	2011-10-28 14:58:53 +02:00
cpu.h
cpufeature.h	x86/amd: Add missing feature flag for fam15h models 10h-1fh processors	2012-01-26 12:06:38 +01:00
cpumask.h
cputime.h
current.h
debugreg.h	x86: Add counter when debug stack is used with interrupts enabled	2011-12-21 15:38:56 -05:00
delay.h
desc.h	x86: Keep current stack in NMI breakpoints	2011-12-21 15:38:55 -05:00
desc_defs.h
device.h	iommu: Rename the DMAR and INTR_REMAP config options	2011-09-21 10:22:03 +02:00
div64.h	x86/div64: Add a micro-optimization shortcut if base is power of two	2011-12-05 18:16:11 +01:00
dma-mapping.h	doc: fix broken references	2011-09-27 18:08:04 +02:00
dma.h
dmi.h
dwarf2.h	x86-64: Fix CFI data for interrupt frames	2011-09-28 19:04:52 +02:00
e820.h	Revert "x86, efi: Calling __pa() with an ioremap()ed address is invalid"	2011-12-12 18:25:56 +01:00
edac.h
efi.h	Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-11 19:12:33 -08:00
elf.h
emergency-restart.h
entry_arch.h
errno.h
fb.h
fcntl.h
fixmap.h	x86/intel config: Revamp configuration to allow for Moorestown and Medfield	2011-12-18 09:17:02 +01:00
floppy.h
frame.h
ftrace.h
futex.h
gart.h
genapic.h
geode.h
gpio.h
hardirq.h	x86: Convert per-cpu counter icr_read_retry_count into a member of irq_stat	2011-12-18 10:46:48 +01:00
highmem.h
hpet.h
hugetlb.h
hw_breakpoint.h
hw_irq.h	iommu: Rename the DMAR and INTR_REMAP config options	2011-09-21 10:22:03 +02:00
hypertransport.h
hyperv.h	Staging: hv: vmbus: Retry vmbus_post_msg() before giving up	2011-08-25 15:23:19 -07:00
hypervisor.h
i387.h	i387: support lazy restore of FPU state	2012-02-20 10:58:54 -08:00
i8259.h
ia32.h
ia32_unistd.h	x86: Generate system call tables and unistd_*.h from tables	2011-11-17 13:35:37 -08:00
idle.h
inat.h
inat_types.h
init.h	x86, mm: Unify zone_sizes_init()	2011-11-11 10:22:55 +01:00
insn.h	x86, perf: Add a build-time sanity test to the x86 decoder	2011-11-10 12:38:51 +01:00
inst.h
intel_scu_ipc.h	x86,mrst: Power control commands update	2011-12-05 12:42:11 +01:00
io.h
io_apic.h
ioctl.h
ioctls.h
iomap.h
iommu.h	iommu: Add option to group multi-function devices	2011-11-15 12:22:31 +01:00
iommu_table.h
ipcbuf.h
ipi.h
irq.h
irq_controller.h
irq_regs.h
irq_remapping.h	iommu: Rename the DMAR and INTR_REMAP config options	2011-09-21 10:22:03 +02:00
irq_vectors.h	x86/irq: Standardize on CONFIG_SPARSE_IRQ=y	2011-10-13 12:12:12 +02:00
irqflags.h
ist.h
jump_label.h
Kbuild	x86: Generate system call tables and unistd_*.h from tables	2011-11-17 13:35:37 -08:00
kdebug.h
kexec.h
kgdb.h
kmap_types.h
kmemcheck.h
kprobes.h
kvm.h
kvm_emulate.h	KVM: x86: fix missing checks in syscall emulation	2012-02-01 11:43:40 +02:00
kvm_host.h	KVM: Add generic RDPMC support	2011-12-27 11:24:35 +02:00
kvm_para.h
ldt.h
lguest.h
lguest_hcall.h
linkage.h
local.h
local64.h
mach_timer.h	time: x86: Remove CLOCK_TICK_RATE from mach_timer.h	2011-11-21 19:00:57 -08:00
mach_traps.h	x86/mrst: Avoid reporting wrong nmi status	2011-11-10 16:21:01 +01:00
math_emu.h
mc146818rtc.h	x86: Use "do { } while(0)" for empty lock_cmos()/unlock_cmos() macros	2011-12-18 09:14:31 +01:00
mca.h
mca_dma.h
mce.h	mce: fix warning messages about static struct mce_device	2012-01-16 17:08:42 -08:00
microcode.h	x86, microcode, AMD: Add a vendor-specific exit function	2011-12-14 12:46:47 +01:00
mman.h
mmconfig.h
mmu.h
mmu_context.h
mmx.h
mmzone.h
mmzone_32.h
mmzone_64.h
module.h
mpspec.h
mpspec_def.h
mrst-vrtc.h
mrst.h	Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty	2012-01-09 12:09:24 -08:00
msgbuf.h
mshyperv.h
msidef.h
msr-index.h	x86: TSC deadline definitions	2011-09-25 19:53:00 +03:00
msr.h	x86: Document rdmsr_safe restrictions	2011-12-05 14:28:37 +01:00
mtrr.h
mutex.h
mutex_32.h
mutex_64.h
mwait.h
nmi.h	x86, nmi: Add in logic to handle multiple events and unknown NMIs	2011-10-10 06:57:01 +02:00
nops.h
numa.h
numa_32.h
numa_64.h
numaq.h
olpc.h
olpc_ofw.h
page.h
page_32.h
page_32_types.h
page_64.h
page_64_types.h
page_types.h
param.h
paravirt.h
paravirt_types.h
parport.h
pat.h
pci-direct.h
pci-functions.h
pci.h	x86/PCI: Expand the x86_msi_ops to have a restore MSIs.	2012-01-06 14:02:26 -08:00
pci_64.h
pci_x86.h	PCI: Pull PCI 'latency timer' setup up into the core	2012-01-06 12:10:42 -08:00
percpu.h	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2012-01-09 13:08:28 -08:00
perf_event.h	perf events: Enable raw event support for Intel unhalted_reference_cycles event	2011-12-21 10:26:32 +01:00
perf_event_p4.h
pgalloc.h
pgtable-2level.h
pgtable-2level_types.h
pgtable-3level.h
pgtable-3level_types.h
pgtable.h	x86: Use "do { } while(0)" for empty flush_tlb_fix_spurious_fault() macro	2011-12-18 09:14:18 +01:00
pgtable_32.h
pgtable_32_types.h
pgtable_64.h
pgtable_64_types.h
pgtable_types.h
poll.h
posix_types.h
posix_types_32.h
posix_types_64.h
prctl.h
probe_roms.h
processor-cyrix.h
processor-flags.h	x86: Fix rflags in FAKE_STACK_FRAME	2011-12-06 10:02:38 +01:00
processor.h	i387: support lazy restore of FPU state	2012-02-20 10:58:54 -08:00
prom.h
proto.h
ptrace-abi.h
ptrace.h
pvclock-abi.h
pvclock.h	KVM: Fix instruction size issue in pvclock scaling	2011-08-30 14:42:30 +03:00
reboot.h	x86, nmi: Wire up NMI handlers to new routines	2011-10-10 06:56:57 +02:00
reboot_fixups.h
required-features.h
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h	x86: Use xadd helper more widely	2011-08-29 13:44:12 -07:00
scatterlist.h
seccomp.h
seccomp_32.h
seccomp_64.h
sections.h
segment.h
sembuf.h
serial.h
serpent.h	crypto: serpent - add 4-way parallel i586/SSE2 assembler implementation	2011-11-21 16:13:23 +08:00
setup.h	x86/intel config: Revamp configuration to allow for Moorestown and Medfield	2011-12-18 09:17:02 +01:00
setup_arch.h
shmbuf.h
shmparam.h
sigcontext.h
sigcontext32.h
sigframe.h
siginfo.h
signal.h
smp.h	x86, NMI: Add NMI IPI selftest	2011-12-05 12:00:16 +01:00
smpboot_hooks.h
socket.h
sockios.h
sparsemem.h
spinlock.h	x86/cmpxchg: add a locked add() helper	2011-11-25 10:42:59 -08:00
spinlock_types.h	x86, ticketlock: Make __ticket_spin_trylock common	2011-08-29 13:46:34 -07:00
stackprotector.h
stacktrace.h
stat.h
statfs.h
string.h
string_32.h
string_64.h
suspend.h
suspend_32.h
suspend_64.h
svm.h
swab.h
swiotlb.h
sync_bitops.h
sys_ia32.h
syscall.h	x86: Move <asm/asm-offsets.h> from trace_syscalls.c to asm/syscall.h	2012-01-07 14:10:18 -08:00
syscalls.h
system.h	xen/pm_idle: Make pm_idle be default_idle under Xen.	2011-12-03 10:49:58 -08:00
tce.h
termbits.h
termios.h
thread_info.h	i387: move TS_USEDFPU flag from thread_info to task_struct	2012-02-18 10:19:41 -08:00
time.h
timer.h	sched, x86: Avoid unnecessary overflow in sched_clock	2011-11-16 19:51:25 +01:00
timex.h
tlb.h
tlbflush.h
topology.h	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci	2012-01-11 18:50:26 -08:00
trampoline.h
traps.h
tsc.h	x86, tsc: Skip TSC synchronization checks for tsc=reliable	2011-12-05 18:00:31 +01:00
types.h
uaccess.h	x86-64: Set siginfo and context on vsyscall emulation faults	2011-12-05 12:17:27 +01:00
uaccess_32.h
uaccess_64.h
ucontext.h
unaligned.h
unistd.h	x86, syscall: Need __ARCH_WANT_SYS_IPC for 32 bits	2012-01-19 12:57:09 -08:00
user.h
user32.h
user_32.h
user_64.h
vdso.h
vga.h
vgtod.h
virtext.h
vm86.h
vmx.h	KVM: APIC: avoid instruction emulation for EOI writes	2011-09-25 19:52:17 +03:00
vsyscall.h
vvar.h
x2apic.h
x86_init.h	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci	2012-01-11 18:50:26 -08:00
xcr.h
xor.h
xor_32.h
xor_64.h
xsave.h