ia64/pv_ops/xen: implement xen pv_time_ops.
implement xen pv_time_ops to account steal time. Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Alex Williamson <alex.williamson@hp.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Isaku Yamahata
Tony Luck
parent
7477de989f
commit
dcbbecdad5
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@ -3,7 +3,7 @@
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#
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obj-y := hypercall.o xenivt.o xensetup.o xen_pv_ops.o irq_xen.o \
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hypervisor.o xencomm.o xcom_hcall.o grant-table.o
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hypervisor.o xencomm.o xcom_hcall.o grant-table.o time.o
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AFLAGS_xenivt.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN
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@ -0,0 +1,180 @@
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/******************************************************************************
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* arch/ia64/xen/time.c
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*
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* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/delay.h>
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#include <linux/kernel_stat.h>
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#include <linux/posix-timers.h>
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#include <linux/irq.h>
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#include <linux/clocksource.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/interface/vcpu.h>
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#include "../kernel/fsyscall_gtod_data.h"
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DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);
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DEFINE_PER_CPU(unsigned long, processed_stolen_time);
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DEFINE_PER_CPU(unsigned long, processed_blocked_time);
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/* taken from i386/kernel/time-xen.c */
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static void xen_init_missing_ticks_accounting(int cpu)
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{
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struct vcpu_register_runstate_memory_area area;
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struct vcpu_runstate_info *runstate = &per_cpu(runstate, cpu);
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int rc;
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memset(runstate, 0, sizeof(*runstate));
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area.addr.v = runstate;
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rc = HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area, cpu,
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&area);
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WARN_ON(rc && rc != -ENOSYS);
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per_cpu(processed_blocked_time, cpu) = runstate->time[RUNSTATE_blocked];
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per_cpu(processed_stolen_time, cpu) = runstate->time[RUNSTATE_runnable]
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+ runstate->time[RUNSTATE_offline];
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}
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/*
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* Runstate accounting
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*/
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/* stolen from arch/x86/xen/time.c */
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static void get_runstate_snapshot(struct vcpu_runstate_info *res)
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{
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u64 state_time;
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struct vcpu_runstate_info *state;
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BUG_ON(preemptible());
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state = &__get_cpu_var(runstate);
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/*
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* The runstate info is always updated by the hypervisor on
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* the current CPU, so there's no need to use anything
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* stronger than a compiler barrier when fetching it.
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*/
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do {
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state_time = state->state_entry_time;
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rmb();
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*res = *state;
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rmb();
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} while (state->state_entry_time != state_time);
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}
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#define NS_PER_TICK (1000000000LL/HZ)
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static unsigned long
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consider_steal_time(unsigned long new_itm)
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{
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unsigned long stolen, blocked;
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unsigned long delta_itm = 0, stolentick = 0;
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int cpu = smp_processor_id();
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struct vcpu_runstate_info runstate;
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struct task_struct *p = current;
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get_runstate_snapshot(&runstate);
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/*
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* Check for vcpu migration effect
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* In this case, itc value is reversed.
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* This causes huge stolen value.
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* This function just checks and reject this effect.
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*/
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if (!time_after_eq(runstate.time[RUNSTATE_blocked],
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per_cpu(processed_blocked_time, cpu)))
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blocked = 0;
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if (!time_after_eq(runstate.time[RUNSTATE_runnable] +
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runstate.time[RUNSTATE_offline],
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per_cpu(processed_stolen_time, cpu)))
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stolen = 0;
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if (!time_after(delta_itm + new_itm, ia64_get_itc()))
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stolentick = ia64_get_itc() - new_itm;
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do_div(stolentick, NS_PER_TICK);
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stolentick++;
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do_div(stolen, NS_PER_TICK);
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if (stolen > stolentick)
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stolen = stolentick;
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stolentick -= stolen;
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do_div(blocked, NS_PER_TICK);
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if (blocked > stolentick)
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blocked = stolentick;
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if (stolen > 0 || blocked > 0) {
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account_steal_time(NULL, jiffies_to_cputime(stolen));
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account_steal_time(idle_task(cpu), jiffies_to_cputime(blocked));
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run_local_timers();
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if (rcu_pending(cpu))
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rcu_check_callbacks(cpu, user_mode(get_irq_regs()));
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scheduler_tick();
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run_posix_cpu_timers(p);
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delta_itm += local_cpu_data->itm_delta * (stolen + blocked);
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if (cpu == time_keeper_id) {
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write_seqlock(&xtime_lock);
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do_timer(stolen + blocked);
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local_cpu_data->itm_next = delta_itm + new_itm;
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write_sequnlock(&xtime_lock);
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} else {
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local_cpu_data->itm_next = delta_itm + new_itm;
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}
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per_cpu(processed_stolen_time, cpu) += NS_PER_TICK * stolen;
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per_cpu(processed_blocked_time, cpu) += NS_PER_TICK * blocked;
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}
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return delta_itm;
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}
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static int xen_do_steal_accounting(unsigned long *new_itm)
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{
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unsigned long delta_itm;
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delta_itm = consider_steal_time(*new_itm);
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*new_itm += delta_itm;
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if (time_after(*new_itm, ia64_get_itc()) && delta_itm)
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return 1;
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return 0;
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}
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static void xen_itc_jitter_data_reset(void)
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{
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u64 lcycle, ret;
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do {
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lcycle = itc_jitter_data.itc_lastcycle;
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ret = cmpxchg(&itc_jitter_data.itc_lastcycle, lcycle, 0);
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} while (unlikely(ret != lcycle));
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}
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struct pv_time_ops xen_time_ops __initdata = {
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.init_missing_ticks_accounting = xen_init_missing_ticks_accounting,
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.do_steal_accounting = xen_do_steal_accounting,
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.clocksource_resume = xen_itc_jitter_data_reset,
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};
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@ -0,0 +1,23 @@
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/******************************************************************************
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* arch/ia64/xen/time.h
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*
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* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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extern struct pv_time_ops xen_time_ops __initdata;
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@ -30,6 +30,7 @@
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#include <asm/xen/privop.h>
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#include "irq_xen.h"
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#include "time.h"
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/***************************************************************************
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* general info
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@ -357,6 +358,7 @@ xen_setup_pv_ops(void)
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pv_cpu_ops = xen_cpu_ops;
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pv_iosapic_ops = xen_iosapic_ops;
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pv_irq_ops = xen_irq_ops;
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pv_time_ops = xen_time_ops;
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paravirt_cpu_asm_init(&xen_cpu_asm_switch);
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}
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