From patchwork Sat Oct 9 02:11:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12546877 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDCADC433F5 for ; Sat, 9 Oct 2021 02:12:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D672B60FD7 for ; Sat, 9 Oct 2021 02:12:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244233AbhJICOx (ORCPT ); Fri, 8 Oct 2021 22:14:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244199AbhJICOv (ORCPT ); Fri, 8 Oct 2021 22:14:51 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31049C061755 for ; Fri, 8 Oct 2021 19:12:55 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id p8-20020a056902114800b005bad2571fbeso3623279ybu.23 for ; Fri, 08 Oct 2021 19:12:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=OSahwrCOM8hvTCjGSN0bryGWa8lO1ktrkgbUtpkiWTU=; b=M5Nnc+p8tzrX3sNy50+q4rLjDSCqSRYtbN8NDtIMtL5lz0M1RLPaDK9QbmYeZ771j6 iFkLbm77/+6Yc0cSHxabd0QyOohOgtVklZfs3Cn2dN0a1ZwfX67QbT1JAQNLhjpc4+uO vi9O60Ie3T48wyOT5Z4Gu0fSaeBm6K+RcT5Zaus4zoWDP/z2bfzcS0MRP6qrM18VmvI1 q2TtwZL4vCj4M6FLDBiRgBUXmYKIdxYeZUm1TBqJ6arSG1KgtQu+aFJsGYHUTkfjGQof tTaWlTLEfPIrKFJvjF0monIrG5PmtaBKUx6Tf3cXwYd6T3mEDwvkPUW8UU30Bw8nBP9y 0gDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=OSahwrCOM8hvTCjGSN0bryGWa8lO1ktrkgbUtpkiWTU=; b=S+6kcgyRGWGzEHcp++/+5sEW2klPa714SgO3Tu0kfAclvOT1VztWy6peyhoWFR1AIx lcIRUGK65l1IyCWZwcN6i5ZmJSu/nKRkQ+b8Aec5E9dvAz0UMy+Co0XOTFl1UlHOx6Ow Rz6Rpz6qCvBwjIuVQkBCwKU02osKc3NeOxtztVsoAmeyAdi/FvcHYbK1IiiSA0qetqj0 e5yoj+IYZqKM8TgQ3Kd/kIbB1p88RJS0yO0QPEkbFKpm9WIxFoaLbcYp6sQtYVI2FBS7 oGn+clmMYqK/sqVVwNUccShbKFD4Wxb19Mb8Gt0nXkd6vVnVB/KrVaOarGcJPNBbq1cU 8BKw== X-Gm-Message-State: AOAM530TiqAOO/ETGpcMT6zrmgCbcBkuLL/V5Ruu7SEma/hrAxMl8gzY zG4ju4SmbPbokBp9j2Df2q97gXrsbv0= X-Google-Smtp-Source: ABdhPJx08F+X6N2reeGnFXth9S6Ys93QnEjCYVn+7HtsQKARH+T/4QlHmLInc1/XQW7XkZX+0RcLTuK00A4= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:e39b:6333:b001:cb]) (user=seanjc job=sendgmr) by 2002:a05:6902:124e:: with SMTP id t14mr2047183ybu.221.1633745574354; Fri, 08 Oct 2021 19:12:54 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 8 Oct 2021 19:11:58 -0700 In-Reply-To: <20211009021236.4122790-1-seanjc@google.com> Message-Id: <20211009021236.4122790-6-seanjc@google.com> Mime-Version: 1.0 References: <20211009021236.4122790-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v2 05/43] KVM: Update halt-polling stats if and only if halt-polling was attempted From: Sean Christopherson To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Paolo Bonzini Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , Oliver Upton , Jing Zhang Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Don't update halt-polling stats if halt-polling wasn't attempted. This is a nop as @poll_ns is guaranteed to be '0' (poll_end == start), but it will allow a future patch to move the histogram stats into the helper to resolve a discrepancy in what is considered a "successful" halt-poll. No functional change intended. Reviewed-by: David Matlack Signed-off-by: Sean Christopherson Reviewed-by: Maxim Levitsky --- virt/kvm/kvm_main.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 5d4a90032277..6156719bcbbc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3217,6 +3217,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) { struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); bool halt_poll_allowed = !kvm_arch_no_poll(vcpu); + bool do_halt_poll = halt_poll_allowed && vcpu->halt_poll_ns; ktime_t start, cur, poll_end; bool waited = false; u64 block_ns; @@ -3224,7 +3225,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) kvm_arch_vcpu_blocking(vcpu); start = cur = poll_end = ktime_get(); - if (vcpu->halt_poll_ns && halt_poll_allowed) { + if (do_halt_poll) { ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); ++vcpu->stat.generic.halt_attempted_poll; @@ -3276,8 +3277,9 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) kvm_arch_vcpu_unblocking(vcpu); block_ns = ktime_to_ns(cur) - ktime_to_ns(start); - update_halt_poll_stats( - vcpu, ktime_to_ns(ktime_sub(poll_end, start)), waited); + if (do_halt_poll) + update_halt_poll_stats( + vcpu, ktime_to_ns(ktime_sub(poll_end, start)), waited); if (halt_poll_allowed) { if (!vcpu_valid_wakeup(vcpu)) {