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@xxxxxxxxxx>
> ---
> 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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