From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org,
linux-s390@vger.kernel.org,
xen-devel-request@lists.xenproject.org, kvm@vger.kernel.org,
xen-devel@lists.xenproject.org, x86@kernel.org
Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
mingo@redhat.com, peterz@infradead.org,
paulmck@linux.vnet.ibm.com, will.deacon@arm.com,
kernellwp@gmail.com, jgross@suse.com, pbonzini@redhat.com,
bsingharora@gmail.com, boqun.feng@gmail.com,
borntraeger@de.ibm.com, rkrcmar@redhat.com,
David.Laight@ACULAB.COM, dave@stgolabs.net,
konrad.wilk@oracle.com,
Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Subject: [PATCH v7 01/11] kernel/sched: introduce vcpu preempted check interface
Date: Wed, 2 Nov 2016 05:08:28 -0400 [thread overview]
Message-ID: <1478077718-37424-2-git-send-email-xinhui.pan@linux.vnet.ibm.com> (raw)
In-Reply-To: <1478077718-37424-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
This patch support to fix lock holder preemption issue.
For kernel users, we could use bool vcpu_is_preempted(int cpu) to detect
if one vcpu is preempted or not.
The default implementation is a macro defined by false. So compiler can
wrap it out if arch dose not support such vcpu preempted check.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Juergen Gross <jgross@suse.com>
---
include/linux/sched.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 348f51b..44c1ce7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3506,6 +3506,18 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
#endif /* CONFIG_SMP */
+/*
+ * In order to deal with a various lock holder preemption issues provide an
+ * interface to see if a vCPU is currently running or not.
+ *
+ * This allows us to terminate optimistic spin loops and block, analogous to
+ * the native optimistic spin heuristic of testing if the lock owner task is
+ * running or not.
+ */
+#ifndef vcpu_is_preempted
+#define vcpu_is_preempted(cpu) false
+#endif
+
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
--
2.4.11
WARNING: multiple messages have this Message-ID (diff)
From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org,
linux-s390@vger.kernel.org,
xen-devel-request@lists.xenproject.org, kvm@vger.kernel.org,
xen-devel@lists.xenproject.org, x86@kernel.org
Cc: kernellwp@gmail.com, jgross@suse.com, dave@stgolabs.net,
David.Laight@ACULAB.COM, rkrcmar@redhat.com,
peterz@infradead.org, benh@kernel.crashing.org,
konrad.wilk@oracle.com, will.deacon@arm.com,
Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>,
mingo@redhat.com, paulus@samba.org, mpe@ellerman.id.au,
pbonzini@redhat.com, paulmck@linux.vnet.ibm.com,
boqun.feng@gmail.com
Subject: [PATCH v7 01/11] kernel/sched: introduce vcpu preempted check interface
Date: Wed, 2 Nov 2016 05:08:28 -0400 [thread overview]
Message-ID: <1478077718-37424-2-git-send-email-xinhui.pan@linux.vnet.ibm.com> (raw)
In-Reply-To: <1478077718-37424-1-git-send-email-xinhui.pan@linux.vnet.ibm.com>
This patch support to fix lock holder preemption issue.
For kernel users, we could use bool vcpu_is_preempted(int cpu) to detect
if one vcpu is preempted or not.
The default implementation is a macro defined by false. So compiler can
wrap it out if arch dose not support such vcpu preempted check.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Juergen Gross <jgross@suse.com>
---
include/linux/sched.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 348f51b..44c1ce7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3506,6 +3506,18 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
#endif /* CONFIG_SMP */
+/*
+ * In order to deal with a various lock holder preemption issues provide an
+ * interface to see if a vCPU is currently running or not.
+ *
+ * This allows us to terminate optimistic spin loops and block, analogous to
+ * the native optimistic spin heuristic of testing if the lock owner task is
+ * running or not.
+ */
+#ifndef vcpu_is_preempted
+#define vcpu_is_preempted(cpu) false
+#endif
+
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
--
2.4.11
next prev parent reply other threads:[~2016-11-02 5:13 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-02 9:08 [PATCH v7 00/11] implement vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui [this message]
2016-11-02 9:08 ` [PATCH v7 01/11] kernel/sched: introduce vcpu preempted check interface Pan Xinhui
2016-11-22 12:31 ` [tip:locking/core] sched/core: Introduce the vcpu_is_preempted(cpu) interface tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 01/11] kernel/sched: introduce vcpu preempted check interface Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 02/11] locking/osq: Drop the overload of osq_lock() Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:36 ` [tip:locking/core] locking/osq: Break out of spin-wait busy waiting loop for a preempted vCPU in osq_lock() tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 02/11] locking/osq: Drop the overload of osq_lock() Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 03/11] kernel/locking: Drop the overload of {mutex,rwsem}_spin_on_owner Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 03/11] kernel/locking: Drop the overload of {mutex, rwsem}_spin_on_owner Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:36 ` [tip:locking/core] locking/mutex: Break out of expensive busy-loop on {mutex,rwsem}_spin_on_owner() when owner vCPU is preempted tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 03/11] kernel/locking: Drop the overload of {mutex, rwsem}_spin_on_owner Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 04/11] powerpc/spinlock: support vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:32 ` [tip:locking/core] locking/core, powerpc: Implement vcpu_is_preempted(cpu) tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 04/11] powerpc/spinlock: support vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 05/11] s390/spinlock: Provide vcpu_is_preempted Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:32 ` [tip:locking/core] locking/spinlocks, s390: Implement vcpu_is_preempted(cpu) tip-bot for Christian Borntraeger
2016-11-02 9:08 ` [PATCH v7 05/11] s390/spinlock: Provide vcpu_is_preempted Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 06/11] x86, paravirt: Add interface to support kvm/xen vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-15 15:47 ` Peter Zijlstra
2016-11-15 15:47 ` Peter Zijlstra
2016-11-16 4:19 ` Pan Xinhui
2016-11-16 4:19 ` Pan Xinhui
2016-11-16 10:23 ` Peter Zijlstra
2016-11-16 10:23 ` Peter Zijlstra
2016-11-16 11:29 ` Christian Borntraeger
2016-11-16 11:29 ` Christian Borntraeger
2016-11-16 11:29 ` Christian Borntraeger
2016-11-16 11:43 ` Peter Zijlstra
2016-11-16 11:43 ` Peter Zijlstra
2016-11-16 11:43 ` Peter Zijlstra
2016-11-17 5:16 ` Pan Xinhui
2016-11-17 5:16 ` Pan Xinhui
2016-11-17 5:16 ` Pan Xinhui
2016-11-16 10:23 ` Peter Zijlstra
2016-11-16 4:19 ` Pan Xinhui
2016-11-15 15:47 ` Peter Zijlstra
2016-11-22 12:33 ` [tip:locking/core] locking/core, x86/paravirt: Implement vcpu_is_preempted(cpu) for KVM and Xen guests tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 06/11] x86, paravirt: Add interface to support kvm/xen vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 07/11] KVM: Introduce kvm_write_guest_offset_cached Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:33 ` [tip:locking/core] kvm: Introduce kvm_write_guest_offset_cached() tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 08/11] x86, kvm/x86.c: support vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:34 ` [tip:locking/core] x86/kvm: Support the vCPU preemption check tip-bot for Pan Xinhui
2016-12-19 11:42 ` [PATCH v7 08/11] x86, kvm/x86.c: support vcpu preempted check Andrea Arcangeli
2016-12-19 11:42 ` Andrea Arcangeli
2016-12-19 11:42 ` [Qemu-devel] " Andrea Arcangeli
2016-12-19 11:42 ` Andrea Arcangeli
2016-12-19 13:56 ` Pan Xinhui
2016-12-19 13:56 ` [Qemu-devel] " Pan Xinhui
2016-12-19 13:56 ` Pan Xinhui
2016-12-19 14:39 ` Paolo Bonzini
2016-12-19 14:39 ` [Qemu-devel] " Paolo Bonzini
2016-12-19 14:39 ` Paolo Bonzini
2016-11-02 9:08 ` Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 09/11] x86, kernel/kvm.c: " Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:34 ` [tip:locking/core] x86/kvm: Support the vCPU preemption check tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 10/11] x86, xen: support vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
2016-11-22 12:35 ` [tip:locking/core] x86/xen: Support the vCPU preemption check tip-bot for Juergen Gross
2016-11-02 9:08 ` [PATCH v7 11/11] Documentation: virtual: kvm: Support vcpu preempted check Pan Xinhui
2016-11-22 12:35 ` [tip:locking/core] Documentation/virtual/kvm: Support the vCPU preemption check tip-bot for Pan Xinhui
2016-11-02 9:08 ` [PATCH v7 11/11] Documentation: virtual: kvm: Support vcpu preempted check Pan Xinhui
2016-11-02 9:08 ` Pan Xinhui
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