Messages in this thread Patch in this message | | | Date | Tue, 22 Nov 2016 04:31:28 -0800 | From | tip-bot for Pan Xinhui <> | Subject | [tip:locking/core] sched/core: Introduce the vcpu_is_preempted(cpu) interface |
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Commit-ID: d9345c65eb7930ac6755cf593ee7686f4029ccf4 Gitweb: http://git.kernel.org/tip/d9345c65eb7930ac6755cf593ee7686f4029ccf4 Author: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> AuthorDate: Wed, 2 Nov 2016 05:08:28 -0400 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 22 Nov 2016 12:48:05 +0100
sched/core: Introduce the vcpu_is_preempted(cpu) interface
This patch is the first step to add support to improve lock holder preemption beaviour.
vcpu_is_preempted(cpu) does the obvious thing: it tells us whether a vCPU is preempted or not.
Defaults to false on architectures that don't support it.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Juergen Gross <jgross@suse.com> Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> [ Translated the changelog to English. ] Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: benh@kernel.crashing.org Cc: boqun.feng@gmail.com Cc: bsingharora@gmail.com Cc: dave@stgolabs.net Cc: kernellwp@gmail.com Cc: konrad.wilk@oracle.com Cc: linuxppc-dev@lists.ozlabs.org Cc: mpe@ellerman.id.au Cc: paulmck@linux.vnet.ibm.com Cc: paulus@samba.org Cc: rkrcmar@redhat.com Cc: virtualization@lists.linux-foundation.org Cc: will.deacon@arm.com Cc: xen-devel-request@lists.xenproject.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1478077718-37424-2-git-send-email-xinhui.pan@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- include/linux/sched.h | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h index dc37cbe..37261af 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -3510,6 +3510,18 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) #endif /* CONFIG_SMP */ +/* + * In order to reduce various lock holder preemption latencies 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);
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