Wanpeng Li 9c48d517ce KVM: X86: Reduce the overhead when lapic_timer_advance is disabled ... When I run ebizzy in a 32 vCPUs guest on a 32 pCPUs Xeon box, I can observe ~8000 kvm_wait_lapic_expire CurAvg/s through kvm_stat tool even if the advance tscdeadline hrtimer expiration is disabled. Each call to wait_lapic_expire() will consume ~70 cycles when a timer fires since apic_timer_expire() will set expired_tscdeadline and then wait_lapic_expire() will do some caculation before bailing out. So total ~175us per second is lost on this 3.2Ghz machine. This patch reduces the overhead by skipping the function wait_lapic_expire() when lapic_timer_advance is disabled. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2017-12-14 09:26:48 +01:00
..
boot	x86/boot/KASLR: Remove unused variable	2017-11-23 20:17:59 +01:00
configs	x86/unwind: Rename unwinder config options to 'CONFIG_UNWINDER_*'	2017-10-14 10:12:12 +02:00
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2017-11-14 10:52:09 -08:00
entry	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-06 17:47:29 -08:00
events	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-11-26 14:11:54 -08:00
hyperv	Char/Misc patches for 4.15-rc1	2017-11-16 09:10:59 -08:00
ia32	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
include	KVM: x86: Add emulation of MSR_SMI_COUNT	2017-12-14 09:26:44 +01:00
kernel	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-06 17:47:29 -08:00
kvm	KVM: X86: Reduce the overhead when lapic_timer_advance is disabled	2017-12-14 09:26:48 +01:00
lib	x86/decoder: Add new TEST instruction pattern	2017-11-24 08:36:12 +01:00
math-emu	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mm	kmemcheck: rip it out for real	2017-12-08 13:40:17 -08:00
net	bpf: fix bpf_tail_call() x64 JIT	2017-10-03 16:04:44 -07:00
oprofile	Modules updates for v4.15	2017-11-15 13:46:33 -08:00
pci	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-06 17:47:29 -08:00
platform	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-06 17:47:29 -08:00
power	x86/power: Fix some ordering bugs in __restore_processor_context()	2017-12-06 12:29:12 +01:00
purgatory	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ras	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
realmode	x86/realmode: Don't decrypt trampoline area under SEV	2017-11-07 15:35:55 +01:00
tools	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
um	Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts	2017-11-07 10:53:06 +01:00
video
xen	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-12-06 17:47:29 -08:00
.gitignore
Kbuild	Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-09-07 09:25:15 -07:00
Kconfig	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-11-26 14:11:54 -08:00
Kconfig.cpu	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig.debug	Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts	2017-11-07 10:53:06 +01:00
Makefile	kmemcheck: remove annotations	2017-11-15 18:21:04 -08:00
Makefile_32.cpu	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile.um	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00