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=-3.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=ham 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 06FF0C04AB6 for ; Tue, 28 May 2019 09:57:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CD90E208CB for ; Tue, 28 May 2019 09:57:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="IYgKoX/x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726684AbfE1J5y (ORCPT ); Tue, 28 May 2019 05:57:54 -0400 Received: from mail-oi1-f194.google.com ([209.85.167.194]:35526 "EHLO mail-oi1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726619AbfE1J5x (ORCPT ); Tue, 28 May 2019 05:57:53 -0400 Received: by mail-oi1-f194.google.com with SMTP id a132so13789981oib.2; Tue, 28 May 2019 02:57:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=ZxUx9/0XpsNkuHkZIZc8kE57BDMIB0rWqNkkuQgzAg0=; b=IYgKoX/xMOL0sUMR9casKcbEw510z1iSIJ2M604fa0u+2PkjidFvyzr1wgsQCDta2j InALDsn/ZHKxkpi7G5zWdrd5xgrX2dbuQCdur6fzJKHkmyUmB6HhMxcF7ZKHyZzVnlRk OSQRBbeeYG/y8hqK8yztSrFgMPLP99HyMpd4xzA8n70E3k3d/PYwyu10qwqtEOgg//Yr xPdd4nudpksd1qmAd9OEUo7I1919bpPfKHls5pwnA6ZAl82WLZzcJTtoQi5jJ36ChfvK au4HoT9zkx6O8LBhGeYKrYwAgUTjK7GEgQ1ZEGFWnuhxF3EV5He5k7nesW0gy7WN0F+I 5RNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=ZxUx9/0XpsNkuHkZIZc8kE57BDMIB0rWqNkkuQgzAg0=; b=oBgwi/56kOJYR7bwLuBlUFQwJvCEd+1vL41oUTHYmMe/jpr9a7TEVjJSU5pHLvc2Mo e7VWnL4Gv1vJx3pv3QaYbzPc+1o0AnLfj557K2LxYwaJFCSYhYDNl2tKI7QS71piT3bi TNySx3Bs6/3RYURccttN73QKX9FwWq0U/a+A3tw8/df0Y5GHZZ/98DLIT+/DcfAWMGOi 5mcOkqsoJRGjK9s2ToBmTZtQKFJb6tCkIkwMBiH/n8XFnfw5SSK8rQwxkJhjH0+NDDHU lscgnYvWAkEnrdfe+5x9tYONJT/NGO75DZwyPFH4RyZCRNTZgUvu9pneZhTmEYNDeIgk axkw== X-Gm-Message-State: APjAAAVb4jm8c0biN6U4B8jBdVu0p2e21xudALU8q4/DmQ0GwU4MQkdE e/1bQYR0/JY6lb7jKRD2W9408d4JkTs85BpT06I= X-Google-Smtp-Source: APXvYqxaxzDFYV0ejSvXPme9ryOZxi2rqz1XBxiDFyXc1jtbllTKowLDM2c8rHFeB/rdzgMHbqHlLB2QzUL5RBDtd8w= X-Received: by 2002:aca:b7c1:: with SMTP id h184mr2165646oif.5.1559037473152; Tue, 28 May 2019 02:57:53 -0700 (PDT) MIME-Version: 1.0 References: <1559004795-19927-1-git-send-email-wanpengli@tencent.com> <1559004795-19927-3-git-send-email-wanpengli@tencent.com> <9f3ff1f4-8173-3037-0a3f-a6036076bca5@de.ibm.com> In-Reply-To: <9f3ff1f4-8173-3037-0a3f-a6036076bca5@de.ibm.com> From: Wanpeng Li Date: Tue, 28 May 2019 17:57:46 +0800 Message-ID: Subject: Re: [PATCH v2 2/3] KVM: X86: Implement PV sched yield hypercall To: Christian Borntraeger Cc: LKML , kvm , Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 28 May 2019 at 17:12, Christian Borntraeger wrote: > > On 28.05.19 02:53, Wanpeng Li wrote: > > From: Wanpeng Li > > > > The target vCPUs are in runnable state after vcpu_kick and suitable > > as a yield target. This patch implements the sched yield hypercall. > > > > 17% performace increase of ebizzy benchmark can be observed in an > > over-subscribe environment. (w/ kvm-pv-tlb disabled, testing TLB flush > > call-function IPI-many since call-function is not easy to be trigged > > by userspace workload). > > > > Cc: Paolo Bonzini > > Cc: Radim Kr=C4=8Dm=C3=A1=C5=99 > > Signed-off-by: Wanpeng Li > > FWIW, we do have a similar interface in s390. > > See arch/s390/kvm/diag.c __diag_time_slice_end_directed for our implemen= tation. Good to know this. :) Regards, Wanpeng Li