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SubjectRe: [PATCH 02/24] cputime: Generic on-demand virtual cputime accounting
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On Thu, 2012-12-20 at 19:32 +0100, Frederic Weisbecker wrote:

> diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
> index 293b202..da0a9e7 100644
> --- a/kernel/sched/cputime.c
> +++ b/kernel/sched/cputime.c
> @@ -3,6 +3,7 @@
> #include <linux/tsacct_kern.h>
> #include <linux/kernel_stat.h>
> #include <linux/static_key.h>
> +#include <linux/context_tracking.h>
> #include "sched.h"
>
>
> @@ -495,10 +496,24 @@ void vtime_task_switch(struct task_struct *prev)
> #ifndef __ARCH_HAS_VTIME_ACCOUNT
> void vtime_account(struct task_struct *tsk)
> {
> - if (in_interrupt() || !is_idle_task(tsk))
> - vtime_account_system(tsk);
> - else
> - vtime_account_idle(tsk);
> + if (!in_interrupt()) {
> + /*
> + * If we interrupted user, context_tracking_in_user()
> + * is 1 because the context tracking don't hook
> + * on irq entry/exit. This way we know if
> + * we need to flush user time on kernel entry.
> + */
> + if (context_tracking_in_user()) {
> + vtime_account_user(tsk);
> + return;
> + }
> +
> + if (is_idle_task(tsk)) {
> + vtime_account_idle(tsk);
> + return;
> + }
> + }
> + vtime_account_system(tsk);
> }
> EXPORT_SYMBOL_GPL(vtime_account);
> #endif /* __ARCH_HAS_VTIME_ACCOUNT */
> @@ -586,4 +601,72 @@ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime
> thread_group_cputime(p, &cputime);
> cputime_adjust(&cputime, &p->signal->prev_cputime, ut, st);
> }
> -#endif

Deleted #endif here.

> +
> +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN

Added #ifdef here.

> +static DEFINE_PER_CPU(long, last_jiffies) = INITIAL_JIFFIES;
> +
> +static cputime_t get_vtime_delta(void)
> +{
> + long delta;
> +
> + delta = jiffies - __this_cpu_read(last_jiffies);
> + __this_cpu_add(last_jiffies, delta);
> +
> + return jiffies_to_cputime(delta);
> +}
> +
> +void vtime_account_system(struct task_struct *tsk)
> +{
> + cputime_t delta_cpu = get_vtime_delta();
> +
> + account_system_time(tsk, irq_count(), delta_cpu, cputime_to_scaled(delta_cpu));
> +}
> +
> +void vtime_account_user(struct task_struct *tsk)
> +{
> + cputime_t delta_cpu = get_vtime_delta();
> +
> + /*
> + * This is an unfortunate hack: if we flush user time only on
> + * irq entry, we miss the jiffies update and the time is spuriously
> + * accounted to system time.
> + */
> + if (context_tracking_in_user())
> + account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
> +}
> +
> +void vtime_account_idle(struct task_struct *tsk)
> +{
> + cputime_t delta_cpu = get_vtime_delta();
> +
> + account_idle_time(delta_cpu);
> +}
> +
> +static int __cpuinit vtime_cpu_notify(struct notifier_block *self,
> + unsigned long action, void *hcpu)
> +{
> + long cpu = (long)hcpu;
> + long *last_jiffies_cpu = per_cpu_ptr(&last_jiffies, cpu);
> +
> + switch (action) {
> + case CPU_UP_PREPARE:
> + case CPU_UP_PREPARE_FROZEN:
> + /*
> + * CHECKME: ensure that's visible by the CPU
> + * once it wakes up
> + */
> + *last_jiffies_cpu = jiffies;
> + default:
> + break;
> + }
> +
> + return NOTIFY_OK;
> +}
> +
> +static int __init init_vtime(void)
> +{
> + cpu_notifier(vtime_cpu_notify, 0);
> + return 0;
> +}
> +early_initcall(init_vtime);
> +#endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */

Added #endif here

Hmm, missing #endif somewhere. Must explain my error message:

kernel/sched/cputime.c:448:0: error: unterminated #else

Looks like a possible mismerge.

-- Steve





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