linux-kernel - Re: [PATCH v2] kvm: remove dependence on delay-accounting

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Date:	Mon, 16 Jan 2012 09:14:46 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH v2] kvm: remove dependence on delay-accounting

On Sat, Jan 14, 2012 at 08:30:51PM +0400, Konstantin Khlebnikov wrote:
> KVM selects delay-accounting only to get sched-info for steal-time accounting.
> Meanwhile delay-accounting can be disabled by boot option. This is ridiculous.
> 
> This patch adds internal boolean option CONFIG_TASK_SCHED_INFO to enable only
> task->sched_info and its collecting inside scheduler.
> 
> v2:
> * stupid misprint fixed
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> ---
>  arch/x86/kvm/Kconfig  |    5 +----
>  include/linux/sched.h |    6 ++----
>  init/Kconfig          |    7 +++++++
>  kernel/sched/core.c   |    2 +-
>  kernel/sched/stats.h  |    4 ++--
>  lib/Kconfig.debug     |    1 +
>  6 files changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 1a7fe86..e3952e8 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -22,8 +22,6 @@ config KVM
>  	depends on HAVE_KVM
>  	# for device assignment:
>  	depends on PCI
> -	# for TASKSTATS/TASK_DELAY_ACCT:
> -	depends on NET
>  	select PREEMPT_NOTIFIERS
>  	select MMU_NOTIFIER
>  	select ANON_INODES
> @@ -33,8 +31,7 @@ config KVM
>  	select KVM_ASYNC_PF
>  	select USER_RETURN_NOTIFIER
>  	select KVM_MMIO
> -	select TASKSTATS
> -	select TASK_DELAY_ACCT
> +	select TASK_SCHED_INFO
>  	select PERF_EVENTS
>  	---help---
>  	  Support hosting fully virtualized guest machines using hardware
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 868cb83..dd5bf78 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -734,7 +734,6 @@ extern struct user_struct root_user;
>  
>  struct backing_dev_info;
>  
> -#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
>  struct sched_info {
>  	/* cumulative counters */
>  	unsigned long pcount;	      /* # of times run on this cpu */
> @@ -744,7 +743,6 @@ struct sched_info {
>  	unsigned long long last_arrival,/* when we last ran on a cpu */
>  			   last_queued;	/* when we were last queued to run */
>  };
> -#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
>  
>  #ifdef CONFIG_TASK_DELAY_ACCT
>  struct task_delay_info {
> @@ -782,7 +780,7 @@ struct task_delay_info {
>  
>  static inline int sched_info_on(void)
>  {
> -#ifdef CONFIG_SCHEDSTATS
> +#if IS_ENABLED(CONFIG_SCHEDSTATS) || IS_ENABLED(CONFIG_KVM)
>  	return 1;

CONFIG_TASK_SCHED_INFO?

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