linux-kernel - Re: [PATCH v3 5/7] KVM: trace kvm_ple

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Message-ID: <20140825135341.GA20218@kria>
Date:	Mon, 25 Aug 2014 15:53:41 +0200
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	Radim Krčmář <rkrcmar@...hat.com>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>,
	Vinod Chegu <chegu_vinod@...com>,
	Hui-Zhi Zhao <hui-zhi.zhao@...com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Lisa Mitchell <lisa.mitchell@...com>
Subject: Re: [PATCH v3 5/7] KVM: trace kvm_ple_window grow/shrink

Hello,

2014-08-21, 18:08:09 +0200, Radim Krčmář wrote:
> Tracepoint for dynamic PLE window, fired on every potential change.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  arch/x86/kvm/trace.h | 30 ++++++++++++++++++++++++++++++
>  arch/x86/kvm/vmx.c   | 10 ++++++++--
>  arch/x86/kvm/x86.c   |  1 +
>  3 files changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index e850a7d..1742dfb 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -848,6 +848,36 @@ TRACE_EVENT(kvm_track_tsc,
>  		  __print_symbolic(__entry->host_clock, host_clocks))
>  );
>  
> +TRACE_EVENT(kvm_ple_window,
> +	TP_PROTO(bool grow, unsigned int vcpu_id, int new, int old),
> +	TP_ARGS(grow, vcpu_id, new, old),
> +
> +	TP_STRUCT__entry(
> +		__field(                bool,      grow         )
> +		__field(        unsigned int,   vcpu_id         )
> +		__field(                 int,       new         )
> +		__field(                 int,       old         )
> +	),
> +
> +	TP_fast_assign(
> +		__entry->grow           = grow;
> +		__entry->vcpu_id        = vcpu_id;
> +		__entry->new            = new;
> +		__entry->old            = old;
> +	),
> +
> +	TP_printk("vcpu %u: ple_window %d (%s %d)",
> +	          __entry->vcpu_id,
> +	          __entry->new,
> +	          __entry->grow ? "grow" : "shrink",
> +	          __entry->old)
> +);
> +
> +#define trace_kvm_ple_window_grow(vcpu_id, new, old) \
> +	trace_kvm_ple_window(true, vcpu_id, new, old)
> +#define trace_kvm_ple_window_shrink(vcpu_id, new, old) \
> +	trace_kvm_ple_window(false, vcpu_id, new, old)
> +
>  #endif /* CONFIG_X86_64 */

Looks like these are needed on 32-bit as well.
Today's linux-next doesn't build:

  CC [M]  arch/x86/kvm/x86.o
In file included from include/linux/linkage.h:6:0,
                 from include/linux/preempt.h:9,
                 from include/linux/preempt_mask.h:4,
                 from include/linux/hardirq.h:4,
                 from include/linux/kvm_host.h:10,
                 from arch/x86/kvm/x86.c:22:
include/linux/tracepoint.h:214:20: error: ‘__tracepoint_kvm_ple_window’ undeclared here (not in a function)
  EXPORT_SYMBOL_GPL(__tracepoint_##name)
                    ^
include/linux/export.h:57:16: note: in definition of macro ‘__EXPORT_SYMBOL’
  extern typeof(sym) sym;     \
                ^
include/linux/tracepoint.h:214:2: note: in expansion of macro ‘EXPORT_SYMBOL_GPL’
  EXPORT_SYMBOL_GPL(__tracepoint_##name)
  ^
arch/x86/kvm/x86.c:7676:1: note: in expansion of macro ‘EXPORT_TRACEPOINT_SYMBOL_GPL’
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window);
 ^


and if I comment out the EXPORT_TRACEPOINT_SYMBOL_GPL:

arch/x86/kvm/vmx.c: In function ‘grow_ple_window’:
arch/x86/kvm/vmx.c:5742:2: error: implicit declaration of function ‘trace_kvm_ple_window_grow’ [-Werror=implicit-function-declaration]
  trace_kvm_ple_window_grow(vcpu->vcpu_id, vmx->ple_window, old);
  ^
arch/x86/kvm/vmx.c: In function ‘shrink_ple_window’:
arch/x86/kvm/vmx.c:5756:2: error: implicit declaration of function ‘trace_kvm_ple_window_shrink’ [-Werror=implicit-function-declaration]
  trace_kvm_ple_window_shrink(vcpu->vcpu_id, vmx->ple_window, old);
  ^
cc1: some warnings being treated as errors
make[2]: *** [arch/x86/kvm/vmx.o] Error 1



I moved the line

#endif /* CONFIG_X86_64 */

above

TRACE_EVENT(kvm_ple_window,

and it builds.


Thanks,

-- 
Sabrina
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