Michael S. Tsirkin 01b71917b5 kvm: optimize out smp_mb after srcu_read_unlock ...

I noticed that srcu_read_lock/unlock both have a memory barrier,
so just by moving srcu_read_unlock earlier we can get rid of
one call to smp_mb() using smp_mb__after_srcu_read_unlock instead.

Unsurprisingly, the gain is small but measureable using the unit test
microbenchmark:
before
        vmcall in the ballpark of 1410 cycles
after
        vmcall in the ballpark of 1360 cycles

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

2013-11-06 09:32:31 +02:00

..

cpuid.c

KVM: x86: trace cpuid emulation when called from emulator

2013-11-05 09:11:40 +02:00

cpuid.h

kvm: Add KVM_GET_EMULATED_CPUID

2013-10-30 18:54:39 +01:00

emulate.c

KVM: emulator: cleanup decode_register_operand() a bit

2013-11-05 09:11:30 +02:00

i8254.c

KVM: Let ioapic know the irq line status

2013-04-15 23:20:34 -03:00

i8254.h

KVM: fold kvm_pit_timer into kvm_kpit_state

2012-08-01 00:21:07 -03:00

i8259.c

KVM: inject ExtINT interrupt before APIC interrupts

2012-12-13 23:05:21 -02:00

irq.c

x86, apicv: add virtual interrupt delivery support

2013-01-29 10:48:19 +02:00

irq.h

KVM: switch to symbolic name for irq_states size

2012-07-20 16:12:16 -03:00

Kconfig

kvm: Add VFIO device

2013-10-30 19:02:03 +01:00

kvm_cache_regs.h

KVM: MMU: Do not unconditionally read PDPTE from guest memory

2011-09-25 19:18:01 +03:00

lapic.c

kvm hypervisor: Simplify kvm_for_each_vcpu with kvm_irq_delivery_to_apic

2013-08-26 12:47:09 +03:00

lapic.h

KVM: Fix RTC interrupt coalescing tracking

2013-06-27 14:20:53 +03:00

Makefile

kvm: Add VFIO device

2013-10-30 19:02:03 +01:00

mmu_audit.c

KVM: do not release the error pfn

2012-08-06 16:04:57 +03:00

mmu.c

KVM: mmu: change useless int return types to void

2013-10-03 15:44:02 +03:00

mmu.h

KVM: mmu: change useless int return types to void

2013-10-03 15:44:02 +03:00

mmutrace.h

KVM: MMU: add tracepoint for check_mmio_spte

2013-06-27 14:20:37 +03:00

paging_tmpl.h

KVM: mmu: allow page tables to be in read-only slots

2013-09-17 12:52:31 +03:00

pmu.c

perf, kvm: Support the in_tx/in_tx_cp modifiers in KVM arch perfmon emulation v5

2013-07-19 18:24:45 +02:00

svm.c

KVM: mmu: change useless int return types to void

2013-10-03 15:44:02 +03:00

trace.h

kvm: Add a tracepoint write_tsc_offset

2013-06-27 14:20:51 +03:00

tss.h

KVM: x86: hardware task switching support

2008-04-27 12:00:39 +03:00

vmx.c

kvm/vmx: error message typo fix

2013-10-31 11:55:15 +01:00

x86.c

kvm: optimize out smp_mb after srcu_read_unlock

2013-11-06 09:32:31 +02:00

x86.h

KVM: x86: mask unsupported XSAVE entries from leaf 0Dh index 0

2013-10-03 12:29:04 +03:00