> Subject: Re: Profiling
>
> On 19/10/12 10:13, Sundaram, Senthilkumar wrote:
>> I would like to profile some of the key Hyp routines including
>> World-Switch, TLB Flush etc.
>>
>>
>>
>> I am planning to use cycle counters to profile these routines. Has
>> anything like this been done before? Any suggestions.
>
> I've played with perf in the recent past, and managed to find some
> interesting results. You'll need a couple of patches on top of
> kvm-arm-master:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-perf
>
> With these patches, you can use "perf kvm". We do not support stack
> unwinding in the guest though.
Checking out kvm-perf gives me the following compile errors:
$ make ARCH=arm zImage
CHK include/linux/version.h
CHK include/generated/utsrelease.h
make[1]: `include/generated/mach-types.h' is up to date.
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
CC arch/arm/kvm/perf.o
In file included from /code/arm-platforms/arch/arm/include/asm/kvm_vgic.h:24:0,
from /code/arm-platforms/arch/arm/include/asm/kvm_host.h:25,
from arch/arm/kvm/perf.c:24:
include/linux/kvm_host.h:215:23: error: field ‘stat’ has incomplete type
include/linux/kvm_host.h:247:23: error: field ‘arch’ has incomplete type
include/linux/kvm_host.h:322:34: error: ‘KVM_MEMORY_SLOTS’ undeclared here (not in a function)
include/linux/kvm_host.h:322:34: error: ‘KVM_PRIVATE_MEM_SLOTS’ undeclared here (not in a function)
include/linux/kvm_host.h:336:25: error: ‘KVM_MAX_VCPUS’ undeclared here (not in a function)
include/linux/kvm_host.h:349:21: error: field ‘stat’ has incomplete type
include/linux/kvm_host.h:350:18: error: field ‘arch’ has incomplete type
include/linux/kvm_host.h: In function ‘gfn_to_index’:
include/linux/kvm_host.h:794:2:
error: implicit declaration of function ‘KVM_HPAGE_GFN_SHIFT’
[-Werror=implicit-function-declaration]
arch/arm/kvm/perf.c: In function ‘vcpu_pc’:
/code/arm-platforms/arch/arm/include/asm/kvm_emulate.h:60:1: warning: control reaches end of non-void function [-Wreturn-type]
arch/arm/kvm/perf.c: In function ‘vcpu_cpsr’:
/code/arm-platforms/arch/arm/include/asm/kvm_emulate.h:65:1: warning: control reaches end of non-void function [-Wreturn-type]
cc1: some warnings being treated as errors
make[1]: *** [arch/arm/kvm/perf.o] Error 1
make: *** [arch/arm/kvm] Error 2
Am I missing a patch or something?
Cheers.
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