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SubjectRe: [PATCH 07/15] ftrace: fix event alignment: kvm:kvm_hv_hypercall
On 12/04/2010 02:13 AM, David Sharp wrote:
> Signed-off-by: David Sharp<dhsharp@google.com>
> ---
> arch/x86/kvm/trace.h | 8 ++++----
> 1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index a6544b8..ab41fb0 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -62,21 +62,21 @@ TRACE_EVENT(kvm_hv_hypercall,
> TP_ARGS(code, fast, rep_cnt, rep_idx, ingpa, outgpa),
>
> TP_STRUCT__entry(
> - __field( __u16, code )
> - __field( bool, fast )
> __field( __u16, rep_cnt )
> __field( __u16, rep_idx )
> __field( __u64, ingpa )
> __field( __u64, outgpa )
> + __field( __u16, code )
> + __field( bool, fast )
> ),
>

Looks like a pessimisation.

Before: 24 bytes
After: 32 bytes

(on a 64-bit machine, assuming no packing)

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.



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