[Xen-devel] Re: [PATCH] cpu idle ticks show twice in xen pvm guest

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Oct 05, 2011 at 10:11:58PM -0700, Zhenzhong Duan wrote:
> Run below test on xen pvm.
> # x=$(cat /proc/stat | grep cpu0 | awk '{print $5}') && sleep 60  \
> && y=$(cat /proc/stat | grep cpu0 | awk '{print $5}') \
> && echo -e  "X:$x\nY:$y\nIDLE:" $(echo "scale=3; ($y-$x)/6000*100" | bc)
> 
> @ X:58562301
> @ Y:58574282
> @ IDLE: 199.600
> 
> Normal idle percent should be around 100%.
> xen_timer_interrupt called account_idle_ticks to account hypervisor stolen 
> idle ticks 
> but these ticks will be accounted again when idle ticks restarted.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
> Signed-off-by: Joe Jin <joe.jin@xxxxxxxxxx>

Please in the future also CC the maintainers (you can get that using
the scripts/get_maintainer.pl).

Jeremy, any thoughts?
> 
> diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
> index 163b467..5dcbc91 100644
> --- a/arch/x86/xen/time.c
> +++ b/arch/x86/xen/time.c
> @@ -151,7 +151,6 @@ static void do_stolen_accounting(void)
>  
>       ticks = iter_div_u64_rem(blocked, NS_PER_TICK, &blocked);
>       __this_cpu_write(xen_residual_blocked, blocked);
> -     account_idle_ticks(ticks);
>  }
>  
>  /* Get the TSC speed from Xen */
> --
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