From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D5CCC742A8 for ; Fri, 12 Jul 2019 07:15:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 633982084B for ; Fri, 12 Jul 2019 07:15:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="VFej0D2S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726100AbfGLHPg (ORCPT ); Fri, 12 Jul 2019 03:15:36 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:38831 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725877AbfGLHPf (ORCPT ); Fri, 12 Jul 2019 03:15:35 -0400 Received: by mail-pg1-f195.google.com with SMTP id z75so4124779pgz.5; Fri, 12 Jul 2019 00:15:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=plx8G9KjIRkO9jPdKCCYg4fdY7Z/wFDK5+GicbywqU8=; b=VFej0D2SY2b0aJzuxn4i5qL4rCyfbMzLnd4yft2sxUqn7/W2P89+AJGX+FnPJnvsT0 irWkaWdDMW44DbJLfgBR5O9nXuorUvZ6Ww6B1FPbwW9+iTf++esQLhqzCcfx/wtKT+9U zR7ZitX0lkbLSuxkeDbruoHLg7luCGcjO2ZcxWHCSCjsb0nHYZ1fp6507EjC4sknX/Xr HtF8HpTBgGvApSGSVe8JopMZx7aVXAT6+EbPjo0cQYnnYL63O9jWXvCHiCW7Do5SRHno iu6Syf+q87bnUAFEh4iL0PSZwYEGjFP416k/Cvr5uhN6X5hMhFh5VHRjiKFESfK8nPi8 ozlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=plx8G9KjIRkO9jPdKCCYg4fdY7Z/wFDK5+GicbywqU8=; b=epqhc3WF3YRUD/dwrJBsUBJALbfuE8xfp6JgvfNZeEh5K+WR++ODFcWyIxGgSjSZWm mp6eJUTMmV4m5vdi2UFacRbXVbMGdEDFt55IDGPSZjDjrxJePa17s4Wg8hhXfil+Ivyi uFYOXryNQCpIZvUqLeWR3d5gEAK49YgZ9lwcigoXtbper+EI1zqXnL/M46xYUxGV+XZV qfTJNnpCbUSw8QSA7GxCODKQYOFNlX4NOVKwft0hgxTO9ekjjxPkV2C9WuTEKWtEyA+a NkjXxzcmxvbEOUl9oQpL/JHIr6iQuVMB9qQdXbwWTT7nlTWVMjAzITgS5t1VJFwubiTN UloA== X-Gm-Message-State: APjAAAX8apj7vPOJPG8rpvcgZzs+jPm7FlsFOaZ2XXpIp172cg8KH84Y XMPK3D5i5QcBTJSSrJuraVAo2n/sHz8= X-Google-Smtp-Source: APXvYqzFAKB2xsc1Z5Am6M03j3zFHDBf7PUfG1clved6rBmUAlipS3m6vkYlbCwEd15othE1pQ+XCQ== X-Received: by 2002:a63:61c6:: with SMTP id v189mr3550132pgb.36.1562915734841; Fri, 12 Jul 2019 00:15:34 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id 135sm7412600pfb.137.2019.07.12.00.15.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 12 Jul 2019 00:15:34 -0700 (PDT) From: Wanpeng Li X-Google-Original-From: Wanpeng Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Christian Borntraeger Subject: [PATCH RESEND] KVM: Boosting vCPUs that are delivering interrupts Date: Fri, 12 Jul 2019 15:15:30 +0800 Message-Id: <1562915730-9490-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Wanpeng Li Inspired by commit 9cac38dd5d (KVM/s390: Set preempted flag during vcpu wakeup and interrupt delivery), except the lock holder, we want to also boost vCPUs that are delivering interrupts. Actually most smp_call_function_many calls are synchronous ipi calls, the ipi target vCPUs are also good yield candidates. This patch sets preempted flag during wakeup and interrupt delivery time. Testing on 80 HT 2 socket Xeon Skylake server, with 80 vCPUs VM 80GB RAM: ebizzy -M vanilla boosting improved 1VM 23000 21232 -9% 2VM 2800 8000 180% 3VM 1800 3100 72% Testing on my Haswell desktop 8 HT, with 8 vCPUs VM 8GB RAM, two VMs, one running ebizzy -M, the other running 'stress --cpu 2': w/ boosting + w/o pv sched yield(vanilla) vanilla boosting improved 1570 4000 55% w/ boosting + w/ pv sched yield(vanilla) vanilla boosting improved 1844 5157 79% w/o boosting, perf top in VM: 72.33% [kernel] [k] smp_call_function_many 4.22% [kernel] [k] call_function_i 3.71% [kernel] [k] async_page_fault w/ boosting, perf top in VM: 38.43% [kernel] [k] smp_call_function_many 6.31% [kernel] [k] async_page_fault 6.13% libc-2.23.so [.] __memcpy_avx_unaligned 4.88% [kernel] [k] call_function_interrupt Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Christian Borntraeger Signed-off-by: Wanpeng Li --- virt/kvm/kvm_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b4ab59d..2c46705 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2404,8 +2404,10 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu) int me; int cpu = vcpu->cpu; - if (kvm_vcpu_wake_up(vcpu)) + if (kvm_vcpu_wake_up(vcpu)) { + vcpu->preempted = true; return; + } me = get_cpu(); if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) -- 2.7.4