From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH v7 6/6] xen/arm: account for stolen ticks Date: Fri, 28 Jun 2013 12:20:47 +0100 Message-ID: <1372418447-24066-6-git-send-email-stefano.stabellini@eu.citrix.com> References: Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: xen-devel@lists.xensource.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, konrad.wilk@oracle.com, marc.zyngier@arm.com, will.deacon@arm.com, Stefano.Stabellini@eu.citrix.com, Ian.Campbell@citrix.com, linux@arm.linux.org.uk, olof@lixom.net, arnd@arndb.de, catalin.marinas@arm.com, Stefano Stabellini List-Id: xen-devel@lists.xenproject.org Register the runstate_memory_area with the hypervisor. Use pv_time_ops.steal_clock to account for stolen ticks. Signed-off-by: Stefano Stabellini --- Changes in v4: - don't use paravirt_steal_rq_enabled: we do not support retrieving stolen ticks for vcpus other than one we are running on. Changes in v3: - use BUG_ON and smp_processor_id. --- arch/arm/xen/enlighten.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 13609e0..49839d8 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -14,7 +14,10 @@ #include #include #include +#include #include +#include +#include #include #include #include @@ -152,6 +155,19 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma, } EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range); +unsigned long long xen_stolen_accounting(int cpu) +{ + struct vcpu_runstate_info state; + + BUG_ON(cpu != smp_processor_id()); + + xen_get_runstate_snapshot(&state); + + WARN_ON(state.state != RUNSTATE_running); + + return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline]; +} + static void __init xen_percpu_init(void *unused) { struct vcpu_register_vcpu_info info; @@ -169,6 +185,8 @@ static void __init xen_percpu_init(void *unused) BUG_ON(err); per_cpu(xen_vcpu, cpu) = vcpup; + xen_setup_runstate_info(cpu); + enable_percpu_irq(xen_events_irq, 0); } @@ -300,6 +318,9 @@ static int __init xen_init_events(void) on_each_cpu(xen_percpu_init, NULL, 0); + pv_time_ops.steal_clock = xen_stolen_accounting; + static_key_slow_inc(¶virt_steal_enabled); + return 0; } postcore_initcall(xen_init_events); -- 1.7.2.5