From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: Re: [RFT - PATCH v2 0/2] KVM/arm64: add fp/simd lazy switch support Date: Mon, 5 Oct 2015 17:45:40 +0200 Message-ID: <20151005154540.GJ9011@cbox> References: <1442964843-11953-1-git-send-email-m.smarduch@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: marc.zyngier@arm.com, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org To: Mario Smarduch Return-path: Content-Disposition: inline In-Reply-To: <1442964843-11953-1-git-send-email-m.smarduch@samsung.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org On Tue, Sep 22, 2015 at 04:34:01PM -0700, Mario Smarduch wrote: > This is a 2nd itteration for arm64, v1 patches were posted by mistake from an > older branch which included several bugs. Hopefully didn't waste too much of > anyones time. > > This patch series is a followup to the armv7 fp/simd lazy switch > implementation, uses similar approach and depends on the series - see > https://lists.cs.columbia.edu/pipermail/kvmarm/2015-September/016516.html > > It's based on earlier arm64 fp/simd optimization work - see > https://lists.cs.columbia.edu/pipermail/kvmarm/2015-July/015748.html > > And subsequent fixes by Marc and Christoffer at KVM Forum hackathon to handle > 32-bit guest on 64 bit host (and may require more here) - see > https://lists.cs.columbia.edu/pipermail/kvmarm/2015-August/016128.html > > This series has be tested with arm64 on arm64 with several FP applications > running on host and guest, with substantial decrease on number of > fp/simd context switches. From about 30% down to 2% with one guest running. > > At this time I don't have arm32/arm64 working and hoping Christoffer and/or > Marc (or anyone) can test 32-bit guest/64-bit host. > Did you already have some test infrastructure/applications that I can reuse for this purpose or do I have to write userspace software? -Christoffer