From: Gavin Shan <gshan@redhat.com>
To: kvmarm@lists.cs.columbia.edu
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, maz@kernel.org,
mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com,
james.morse@arm.com, suzuki.poulose@arm.com, drjones@redhat.com,
eric.auger@redhat.com, aarcange@redhat.com, shan.gavin@gmail.com
Subject: [PATCH RFCv2 8/9] kernel/sched: Add cpu_rq_is_locked()
Date: Fri, 8 May 2020 13:29:18 +1000 [thread overview]
Message-ID: <20200508032919.52147-9-gshan@redhat.com> (raw)
In-Reply-To: <20200508032919.52147-1-gshan@redhat.com>
This adds API cpu_rq_is_locked() to check if the CPU's runqueue has been
locked or not. It's used in the subsequent patch to determine the task
wakeup should be executed immediately or delayed.
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
include/linux/sched.h | 1 +
kernel/sched/core.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4418f5cb8324..e68882443da7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1691,6 +1691,7 @@ extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *n
*/
extern struct task_struct *find_get_task_by_vpid(pid_t nr);
+extern bool cpu_rq_is_locked(int cpu);
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
extern void wake_up_new_task(struct task_struct *tsk);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9a2fbf98fd6f..30f4a8845495 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -73,6 +73,14 @@ __read_mostly int scheduler_running;
*/
int sysctl_sched_rt_runtime = 950000;
+bool cpu_rq_is_locked(int cpu)
+{
+ struct rq *rq = cpu_rq(cpu);
+
+ return raw_spin_is_locked(&rq->lock) ? true : false;
+}
+EXPORT_SYMBOL_GPL(cpu_rq_is_locked);
+
/*
* __task_rq_lock - lock the rq @p resides on.
*/
--
2.23.0
next prev parent reply other threads:[~2020-05-08 3:31 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 3:29 [PATCH RFCv2 0/9] kvm/arm64: Support Async Page Fault Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 1/9] arm64: Probe for the presence of KVM hypervisor services during boot Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 2/9] arm/arm64: KVM: Advertise KVM UID to guests via SMCCC Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 3/9] kvm/arm64: Rename kvm_vcpu_get_hsr() to kvm_vcpu_get_esr() Gavin Shan
2020-05-26 10:42 ` Mark Rutland
2020-05-27 2:43 ` Gavin Shan
2020-05-27 7:20 ` Marc Zyngier
2020-05-28 6:34 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 4/9] kvm/arm64: Detach ESR operator from vCPU struct Gavin Shan
2020-05-26 10:51 ` Mark Rutland
2020-05-27 2:55 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 5/9] kvm/arm64: Replace hsr with esr Gavin Shan
2020-05-26 10:45 ` Mark Rutland
2020-05-27 2:56 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 6/9] kvm/arm64: Export kvm_handle_user_mem_abort() with prefault mode Gavin Shan
2020-05-26 10:58 ` Mark Rutland
2020-05-27 3:01 ` Gavin Shan
2020-05-08 3:29 ` [PATCH RFCv2 7/9] kvm/arm64: Support async page fault Gavin Shan
2020-05-26 12:34 ` Mark Rutland
2020-05-27 4:05 ` Gavin Shan
2020-05-27 7:37 ` Marc Zyngier
2020-05-28 6:32 ` Gavin Shan
2020-05-08 3:29 ` Gavin Shan [this message]
2020-05-08 3:29 ` [PATCH RFCv2 9/9] arm64: " Gavin Shan
2020-05-26 12:56 ` Mark Rutland
2020-05-27 6:48 ` Paolo Bonzini
2020-05-28 6:14 ` Gavin Shan
2020-05-28 7:03 ` Marc Zyngier
2020-05-28 10:53 ` Paolo Bonzini
2020-05-28 10:48 ` Paolo Bonzini
2020-05-28 23:02 ` Gavin Shan
2020-05-29 9:41 ` Marc Zyngier
2020-05-29 11:11 ` Paolo Bonzini
2020-05-31 12:44 ` Marc Zyngier
2020-06-01 9:21 ` Paolo Bonzini
2020-06-02 5:44 ` Gavin Shan
2020-05-25 23:39 ` [PATCH RFCv2 0/9] kvm/arm64: Support Async Page Fault Gavin Shan
2020-05-26 13:09 ` Mark Rutland
2020-05-27 2:39 ` Gavin Shan
2020-05-27 7:48 ` Marc Zyngier
2020-05-27 16:10 ` Paolo Bonzini
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