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14520c92cb
linux/arch/x86
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Boris Ostrovsky 14520c92cb xen/pci: Use APIC directly when APIC virtualization hardware is available 
When hardware supports APIC/x2APIC virtualization we don't need to use
pirqs for MSI handling and instead use APIC since most APIC accesses
(MMIO or MSR) will now be processed without VMEXITs.

As an example, netperf on the original code produces this profile
(collected wih 'xentrace -e 0x0008ffff -T 5'):

    342 cpu_change
    260 CPUID
  34638 HLT
  64067 INJ_VIRQ
  28374 INTR
  82733 INTR_WINDOW
     10 NPF
  24337 TRAP
 370610 vlapic_accept_pic_intr
 307528 VMENTRY
 307527 VMEXIT
 140998 VMMCALL
    127 wrap_buffer

After applying this patch the same test shows

    230 cpu_change
    260 CPUID
  36542 HLT
    174 INJ_VIRQ
  27250 INTR
    222 INTR_WINDOW
     20 NPF
  24999 TRAP
 381812 vlapic_accept_pic_intr
 166480 VMENTRY
 166479 VMEXIT
  77208 VMMCALL
     81 wrap_buffer

ApacheBench results (ab -n 10000 -c 200) improve by about 10%

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2014-12-04 13:02:43 +00:00
..
boot x86, kaslr: Prevent .bss from overlaping initrd 2014-11-01 22:20:50 +01:00
configs x86: Add "make tinyconfig" to configure the tiniest possible kernel 2014-08-08 16:30:24 -07:00
crypto Revert "crypto: aesni - disable "by8" AVX CTR optimization" 2014-10-02 14:40:28 +08:00
ia32 x86_64, entry: Fix out of bounds read on sysenter 2014-10-31 18:47:09 -07:00
include xen/pci: Use APIC directly when APIC virtualization hardware is available 2014-12-04 13:02:43 +00:00
kernel Merge branch 'x86-traps' (trap handling from Andy Lutomirski) 2014-11-23 13:56:55 -08:00
kvm kvm: fix kvm_is_mmio_pfn() and rename to kvm_is_reserved_pfn() 2014-11-26 14:40:45 +01:00
lguest
lib x86-64: make csum_partial_copy_from_user() error handling consistent 2014-11-16 11:00:42 -08:00
math-emu
mm x86, mm: Set NX across entire PMD at boot 2014-11-18 18:32:24 +01:00
net x86: bpf_jit: fix two bugs in eBPF JIT compiler 2014-10-14 13:13:14 -04:00
oprofile percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t 2014-08-28 08:58:57 -04:00
pci xen/pci: Use APIC directly when APIC virtualization hardware is available 2014-12-04 13:02:43 +00:00
platform Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-10-31 14:30:16 -07:00
power nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2014-10-09 22:26:04 -04:00
purgatory arch/x86/purgatory/Makefile: try to use automatic variable in kexec purgatory makefile 2014-10-14 02:18:21 +02:00
realmode
syscalls bpf: enable bpf syscall on x64 and i386 2014-09-26 15:05:14 -04:00
tools x86, kaslr: Handle Gold linker for finding bss/brk 2014-11-18 18:32:24 +01:00
um Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
vdso x86/vdso: Fix vdso2c's special_pages[] error checking 2014-09-24 09:55:38 +02:00
video
xen x86/core, x86/xen/smp: Use 'die_complete' completion when taking CPU down 2014-11-10 11:16:40 +01:00
.gitignore x86/build: Add arch/x86/purgatory/ make generated files to gitignore 2014-10-09 09:29:46 +02:00
Kbuild kexec: create a new config option CONFIG_KEXEC_FILE for new syscall 2014-08-29 16:28:16 -07:00
Kconfig perf/x86: Fix embarrasing typo 2014-11-04 07:06:58 +01:00
Kconfig.cpu
Kconfig.debug
Makefile Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-10-13 18:17:33 +02:00
Makefile_32.cpu
Makefile.um