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([2001:b07:6468:f312:a0f7:472a:1e7:7ef]) by smtp.gmail.com with ESMTPSA id h124sm21529100wmf.30.2019.11.11.05.53.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Nov 2019 05:53:52 -0800 (PST) Subject: Re: [PATCH 3/5] KVM: ensure pool time is longer than block_ns To: Marcelo Tosatti , Zhenzhong Duan Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, joao.m.martins@oracle.com, rafael.j.wysocki@intel.com, rkrcmar@redhat.com References: <1572060239-17401-1-git-send-email-zhenzhong.duan@oracle.com> <1572060239-17401-4-git-send-email-zhenzhong.duan@oracle.com> <20191101211623.GB20061@amt.cnet> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: <76044f07-0b76-cd91-dc87-82ed3fca061e@redhat.com> Date: Mon, 11 Nov 2019 14:53:54 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191101211623.GB20061@amt.cnet> Content-Language: en-US X-MC-Unique: jPPONaSHMQG9IQ3fmwBUlw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 01/11/19 22:16, Marcelo Tosatti wrote: > =09=09if (!vcpu_valid_wakeup(vcpu)) { > =09=09=09shrink_halt_poll_ns(vcpu); > =09=09} else if (halt_poll_ns) { > -=09=09=09if (block_ns <=3D vcpu->halt_poll_ns) > +=09=09=09if (block_ns < vcpu->halt_poll_ns) > =09=09=09=09; > =09=09=09/* we had a short halt and our poll time is too small */ > =09=09=09else if (block_ns < halt_poll_ns) What about making this "if (!waited)"? The result would be very readable: if (!waited) ; /* we had a long block, shrink polling */ else if (block_ns > halt_poll_ns && vcpu->halt_poll= _ns) shrink_halt_poll_ns(vcpu); /* we had a short halt and our poll time is too sma= ll */ else if (block_ns < halt_poll_ns && vcpu->halt_poll= _ns < halt_poll_ns) grow_halt_poll_ns(vcpu); Paolo