[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC 1/9] schedule: Introduce per-pcpu time accounting
From: Andrii Anisov <andrii_anisov@xxxxxxxx> Introduce per-pcpu time accounting what includes the following states: TACC_HYP - the pcpu executes hypervisor code like softirq processing (including scheduling), tasklets and context switches TACC_GUEST - the pcpu executes guests code TACC_IDLE - the low-power state of the pcpu TACC_IRQ - the pcpu performs interrupts processing, without separation to guest or hypervisor interrupts TACC_GSYNC - the pcpu executes hypervisor code to process synchronous trap from the guest. E.g. hypercall processing or io emulation. Currently, the only reenterant state is TACC_IRQ. It is assumed, no changes to state other than TACC_IRQ could happen until we return from nested interrupts. IRQ time is accounted in a distinct way comparing to other states. It is acumulated between other states transition moments, and is substracted from the old state on states transion calculation. Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx> --- xen/common/schedule.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++ xen/include/xen/sched.h | 27 +++++++++++++++++ 2 files changed, 108 insertions(+) diff --git a/xen/common/schedule.c b/xen/common/schedule.c index 7b71581..6dd6603 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -1539,6 +1539,87 @@ static void schedule(void) context_switch(prev, next); } +DEFINE_PER_CPU(struct tacc, tacc); + +static void tacc_state_change(enum TACC_STATES new_state) +{ + s_time_t now, delta; + struct tacc* tacc = &this_cpu(tacc); + unsigned long flags; + + local_irq_save(flags); + + now = NOW(); + delta = now - tacc->state_entry_time; + + /* We do not expect states reenterability (at least through this function)*/ + ASSERT(new_state != tacc->state); + + tacc->state_time[tacc->state] += delta - tacc->irq_time; + tacc->state_time[TACC_IRQ] += tacc->irq_time; + tacc->irq_time = 0; + tacc->state = new_state; + tacc->state_entry_time = now; + + local_irq_restore(flags); +} + +void tacc_hyp(int place) +{ +// printk("\ttacc_hyp %u, place %d\n", smp_processor_id(), place); + tacc_state_change(TACC_HYP); +} + +void tacc_guest(int place) +{ +// printk("\ttacc_guest %u, place %d\n", smp_processor_id(), place); + tacc_state_change(TACC_GUEST); +} + +void tacc_idle(int place) +{ +// printk("\tidle cpu %u, place %d\n", smp_processor_id(), place); + tacc_state_change(TACC_IDLE); +} + +void tacc_gsync(int place) +{ +// printk("\ttacc_gsync %u, place %d\n", smp_processor_id(), place); + tacc_state_change(TACC_GSYNC); +} + +void tacc_irq_enter(int place) +{ + struct tacc* tacc = &this_cpu(tacc); + +// printk("\ttacc_irq_enter %u, place %d, cnt %d\n", smp_processor_id(), place, this_cpu(tacc).irq_cnt); + ASSERT(!local_irq_is_enabled()); + ASSERT(tacc->irq_cnt >= 0); + + if ( tacc->irq_cnt == 0 ) + { + tacc->irq_enter_time = NOW(); + } + + tacc->irq_cnt++; +} + +void tacc_irq_exit(int place) +{ + struct tacc* tacc = &this_cpu(tacc); + +// printk("\ttacc_irq_exit %u, place %d, cnt %d\n", smp_processor_id(), place, tacc->irq_cnt); + ASSERT(!local_irq_is_enabled()); + ASSERT(tacc->irq_cnt > 0); + if ( tacc->irq_cnt == 1 ) + { + tacc->irq_time = NOW() - tacc->irq_enter_time; + tacc->irq_enter_time = 0; + } + + tacc->irq_cnt--; +} + void context_saved(struct vcpu *prev) { /* Clear running flag /after/ writing context to memory. */ diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index e3601c1..04a8724 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -1002,6 +1002,33 @@ extern void dump_runq(unsigned char key); void arch_do_physinfo(struct xen_sysctl_physinfo *pi); +enum TACC_STATES { + TACC_HYP = 0, + TACC_GUEST = 1, + TACC_IDLE = 2, + TACC_IRQ = 3, + TACC_GSYNC = 4, + TACC_STATES_MAX +}; + +struct tacc +{ + s_time_t state_time[TACC_STATES_MAX]; + s_time_t state_entry_time; + int state; + + s_time_t guest_time; + + s_time_t irq_enter_time; + s_time_t irq_time; + int irq_cnt; +}; + +DECLARE_PER_CPU(struct tacc, tacc); + +void tacc_hyp(int place); +void tacc_idle(int place); + #endif /* __SCHED_H__ */ /* -- 2.7.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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