Implement xen_sched_clock, which returns the number of ns the current vcpu has been actually in the running state (vs blocked, runnable-but-not-running, or offline) since boot. Signed-off-by: Jeremy Fitzhardinge Cc: john stultz --- arch/i386/xen/enlighten.c | 2 +- arch/i386/xen/time.c | 22 +++++++++++++++++++++- arch/i386/xen/xen-ops.h | 3 +-- 3 files changed, 23 insertions(+), 4 deletions(-) =================================================================== --- a/arch/i386/xen/enlighten.c +++ b/arch/i386/xen/enlighten.c @@ -676,7 +676,7 @@ static const struct paravirt_ops xen_par .set_wallclock = xen_set_wallclock, .get_wallclock = xen_get_wallclock, .get_cpu_khz = xen_cpu_khz, - .sched_clock = xen_clocksource_read, + .sched_clock = xen_sched_clock, #ifdef CONFIG_X86_LOCAL_APIC .apic_write = paravirt_nop, =================================================================== --- a/arch/i386/xen/time.c +++ b/arch/i386/xen/time.c @@ -16,6 +16,8 @@ #define XEN_SHIFT 22 #define TIMER_SLOP 100000 /* Xen may fire a timer up to this many ns early */ #define NS_PER_TICK (1000000000ll / HZ) + +static cycle_t xen_clocksource_read(void); /* These are perodically updated in shared_info, and then copied here. */ struct shadow_time_info { @@ -118,6 +120,24 @@ static void do_stolen_accounting(void) account_steal_time(idle_task(smp_processor_id()), ticks); } +/* + * Xen sched_clock implementation. Returns the number of unstolen + * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED + * states. + */ +unsigned long long xen_sched_clock(void) +{ + struct vcpu_runstate_info state; + cycle_t now = xen_clocksource_read(); + + get_runstate_snapshot(&state); + + WARN_ON(state.state != RUNSTATE_running); + + return state.time[RUNSTATE_blocked] + + state.time[RUNSTATE_running] + + (now - state.state_entry_time); +} /* Get the CPU speed from Xen */ @@ -209,7 +229,7 @@ static u64 get_nsec_offset(struct shadow return scale_delta(delta, shadow->tsc_to_nsec_mul, shadow->tsc_shift); } -cycle_t xen_clocksource_read(void) +static cycle_t xen_clocksource_read(void) { struct shadow_time_info *shadow = &get_cpu_var(shadow_time); cycle_t ret; =================================================================== --- a/arch/i386/xen/xen-ops.h +++ b/arch/i386/xen/xen-ops.h @@ -2,7 +2,6 @@ #define XEN_OPS_H #include -#include DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu); DECLARE_PER_CPU(unsigned long, xen_cr3); @@ -18,7 +17,7 @@ void __init xen_time_init(void); void __init xen_time_init(void); unsigned long xen_get_wallclock(void); int xen_set_wallclock(unsigned long time); -cycle_t xen_clocksource_read(void); +unsigned long long xen_sched_clock(void); void xen_mark_init_mm_pinned(void); -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/