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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Radim Krčmář" <rkrcmar@redhat.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Christoffer Dall <cdall@linaro.org>,
	Andrew Jones <drjones@redhat.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Cornelia Huck <cornelia.huck@de.ibm.com>,
	James Hogan <james.hogan@imgtec.com>,
	Paul Mackerras <paulus@ozlabs.org>
Subject: Re: [PATCH 6/6] KVM: perform a wake_up in kvm_make_all_cpus_request
Date: Tue, 11 Apr 2017 16:55:57 +0800	[thread overview]
Message-ID: <3c004ba0-cf01-2fab-b68e-b135689c5dee@redhat.com> (raw)
In-Reply-To: <20170406202056.18379-7-rkrcmar@redhat.com>



On 07/04/2017 04:20, Radim Krčmář wrote:
> I think that most requests do not need the wake up, so we would flip the
> bit then.

True.  I may need a bit more convincing, but let's see the patches:

- point against: no wakeup is a bug, possibly hard to find, while an
extra wakeup is just annoying.

- point in favor: the same argument (multiplied by over 9000) would
apply to a wait flag in the request number, but it would be obviously
stupid to add a no_wait flag to all requests except the couple that
need it.

Thanks,

Paolo

      parent reply	other threads:[~2017-04-11  9:15 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-06 20:20 [PATCH 0/6] KVM: towards maintainable kvm_make_all_cpus_request() Radim Krčmář
2017-04-06 20:20 ` [PATCH RFC 1/6] KVM: fix guest_mode optimization in kvm_make_all_cpus_request() Radim Krčmář
2017-04-06 21:02   ` James Hogan
2017-04-10 15:59     ` Andrew Jones
2017-04-11 10:43       ` James Hogan
2017-04-11  5:25     ` Paolo Bonzini
2017-04-11  9:37       ` James Hogan
2017-04-11 19:31         ` Radim Krčmář
2017-04-11 19:45           ` Paolo Bonzini
2017-04-11 20:45       ` Radim Krčmář
2017-04-12  0:15         ` Paolo Bonzini
2017-04-07 10:47   ` Christian Borntraeger
2017-04-06 20:20 ` [PATCH 2/6] KVM: use kvm_{test,clear}_request instead of {test,clear}_bit Radim Krčmář
2017-04-07 10:55   ` Christian Borntraeger
2017-04-07 12:24     ` Radim Krčmář
2017-04-07 14:05       ` Radim Krčmář
2017-04-06 20:20 ` [PATCH 3/6] KVM: x86: use kvm_make_request instead of set_bit Radim Krčmář
2017-04-07  8:18   ` David Hildenbrand
2017-04-06 20:20 ` [PATCH 4/6] KVM: remove #ifndef CONFIG_S390 around kvm_vcpu_wake_up Radim Krčmář
2017-04-07 11:01   ` Christian Borntraeger
2017-04-06 20:20 ` [PATCH RFC 5/6] KVM: mark requests that do not need a wakeup Radim Krčmář
2017-04-07  8:27   ` Marc Zyngier
2017-04-07 12:29     ` Radim Krčmář
2017-04-06 20:20 ` [PATCH 6/6] KVM: perform a wake_up in kvm_make_all_cpus_request Radim Krčmář
2017-04-10 11:14   ` Andrew Jones
2017-04-11  5:34     ` Paolo Bonzini
2017-04-11 12:04       ` Andrew Jones
2017-04-11  5:37   ` Paolo Bonzini
2017-04-11  8:55   ` Paolo Bonzini [this message]

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