From: Paolo Bonzini <pbonzini@redhat.com>
To: Davidlohr Bueso <dave@stgolabs.net>,
mingo@kernel.org, peterz@infradead.org
Cc: npiggin@gmail.com, paulmck@linux.vnet.ibm.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Cornelia Huck <cohuck@redhat.com>
Subject: Re: [PATCH v2 0/7] swait: Introduce and use swq_has_sleeper()
Date: Fri, 15 Sep 2017 13:53:15 +0200 [thread overview]
Message-ID: <ddde4bc5-ba8c-b7ec-717e-5655c8cbe15d@redhat.com> (raw)
In-Reply-To: <20170913200824.28067-1-dave@stgolabs.net>
On 13/09/2017 22:08, Davidlohr Bueso wrote:
> The following patches fix and/or justify (in baby steps) some of the
> callers. The main exception is s390, which I didn't follow how ->valid_wakeup
> can get hoisted as kvm_vcpu_block does not use that in the wait loop.
valid_wakeup is just an optimization, so it's not a problem.
There seems to be always an atomic_or or set_bit before
kvm_s390_vcpu_wakeup is called (except kvm_s390_idle_wakeup which has no
store at all and doesn't need any serialization). So my suggestion is
to add an smp__mb_after_atomic in kvm_s390_vcpu_wakeup; I'll let the
s390 guys do it.
Paolo
next prev parent reply other threads:[~2017-09-15 11:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 20:08 [PATCH v2 0/7] swait: Introduce and use swq_has_sleeper() Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 1/7] sched/wait: Add swq_has_sleepers() Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 2/7] kvm,async_pf: Use swq_has_sleepers() Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 3/7] kvm,lapic: Justify use of swait_activate() Davidlohr Bueso
2017-09-15 11:47 ` Paolo Bonzini
2017-09-13 20:08 ` [PATCH 4/7] kvm,x86: Fix apf_task_wake_one() wq serialization Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 5/7] kvm: Serialize wq active checks in kvm_vcpu_wake_up() Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 6/7] kvm,powerpc: Serialize wq active checks in ops->vcpu_kick Davidlohr Bueso
2017-09-13 20:08 ` [PATCH 7/7] kvm,mips: Fix potential swait_active() races Davidlohr Bueso
2017-09-13 20:35 ` Paolo Bonzini
2017-09-13 22:22 ` Davidlohr Bueso
2017-09-15 11:33 ` Paolo Bonzini
2017-09-15 11:53 ` Paolo Bonzini [this message]
2017-09-19 8:25 ` [PATCH v2 0/7] swait: Introduce and use swq_has_sleeper() Christian Borntraeger
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