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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
..
Kconfig kvm: Add VFIO device 2013-10-30 19:02:03 +01:00
Makefile kvm: Add VFIO device 2013-10-30 19:02:03 +01:00
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
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
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
mmu_audit.c KVM: do not release the error pfn 2012-08-06 16:04:57 +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