Re: [Qemu-devel] [PATCH] cpus: use cpu_is_stopped efficiently

[Andreas Färber]

Hi,

Am 26.07.2013 10:47, schrieb Tiejun Chen:
> It makes more sense and simple later.
> 
> Signed-off-by: Tiejun Chen <address@hidden>
> ---
>  cpus.c |   14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/cpus.c b/cpus.c
> index c232265..a997632 100644
> --- a/cpus.c
> +++ b/cpus.c
> @@ -62,6 +62,11 @@
>  
>  static CPUArchState *next_cpu;
>  
> +bool cpu_is_stopped(CPUState *cpu)
> +{
> +    return !runstate_is_running() || cpu->stopped;
> +}
> +
>  static bool cpu_thread_is_idle(CPUArchState *env)
>  {
>      CPUState *cpu = ENV_GET_CPU(env);

To optimize performance slightly, I would suggest to reorder the two
conditions as they were below (avoiding the non-inline function call if
cpu->stopped).

Other than that it looks good to me, but no bugfix for 1.6.
If you send a v2 I can queue it on qom-cpu for the next merge window in
two weeks.

CC'ing me would have made me review it earlier. ;) And as you may have
noticed, Avi is no longer with Red Hat, and Gleb and Paolo are
maintaining KVM parts, which there are none in this patch. See
MAINTAINERS file for the latest list.

Regards,
Andreas

> @@ -69,7 +74,7 @@ static bool cpu_thread_is_idle(CPUArchState *env)
>      if (cpu->stop || cpu->queued_work_first) {
>          return false;
>      }
> -    if (cpu->stopped || !runstate_is_running()) {
> +    if (cpu_is_stopped(cpu)) {
>          return true;
>      }
>      if (!cpu->halted || qemu_cpu_has_work(cpu) ||
> @@ -432,11 +437,6 @@ void cpu_synchronize_all_post_init(void)
>      }
>  }
>  
> -bool cpu_is_stopped(CPUState *cpu)
> -{
> -    return !runstate_is_running() || cpu->stopped;
> -}
> -
>  static void do_vm_stop(RunState state)
>  {
>      if (runstate_is_running()) {
> @@ -455,7 +455,7 @@ static bool cpu_can_run(CPUState *cpu)
>      if (cpu->stop) {
>          return false;
>      }
> -    if (cpu->stopped || !runstate_is_running()) {
> +    if (cpu_is_stopped(cpu)) {
>          return false;
>      }
>      return true;
> 


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