From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: [PATCH RFC V4 4/5] kvm : pv-ticketlocks support for linux guests running on KVM hypervisor Date: Tue, 17 Jan 2012 10:49:18 +1100 Message-ID: <4F14B77E.30202@goop.org> References: <20120114182501.8604.68416.sendpatchset@oc5400248562.ibm.com> <20120114182645.8604.68884.sendpatchset@oc5400248562.ibm.com> <4F13E84C.3010808@redhat.com> <4F1430A2.1080401@linux.vnet.ibm.com> <4F143874.9010307@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Raghavendra K T , linux-doc@vger.kernel.org, Peter Zijlstra , Jan Kiszka , Virtualization , Paul Mackerras , "H. Peter Anvin" , Stefano Stabellini , Xen , Dave Jiang , KVM , Glauber Costa , X86 , Ingo Molnar , Rik van Riel , Konrad Rzeszutek Wilk , Greg Kroah-Hartman , Sasha Levin , Sedat Dilek , Thomas Gleixner , LKML , Dave Hansen , Suzuki Poulose , S To: Avi Kivity Return-path: In-Reply-To: <4F143874.9010307@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: kvm.vger.kernel.org On 01/17/2012 01:47 AM, Avi Kivity wrote: > On 01/16/2012 04:13 PM, Raghavendra K T wrote: >>> Please drop all of these and replace with tracepoints in the appropriate >>> spots. Everything else (including the historgram) can be reconstructed >>> the tracepoints in userspace. >>> >> >> I think Jeremy pointed that tracepoints use spinlocks and hence debugfs >> is the option.. no ? >> > Yeah, I think you're right. What a pity. Yes, I went through the same thought process. J From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: [PATCH RFC V4 4/5] kvm : pv-ticketlocks support for linux guests running on KVM hypervisor Date: Tue, 17 Jan 2012 10:49:18 +1100 Message-ID: <4F14B77E.30202@goop.org> References: <20120114182501.8604.68416.sendpatchset@oc5400248562.ibm.com> <20120114182645.8604.68884.sendpatchset@oc5400248562.ibm.com> <4F13E84C.3010808@redhat.com> <4F1430A2.1080401@linux.vnet.ibm.com> <4F143874.9010307@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4F143874.9010307@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Avi Kivity Cc: Raghavendra K T , linux-doc@vger.kernel.org, Peter Zijlstra , Jan Kiszka , Virtualization , Paul Mackerras , "H. Peter Anvin" , Stefano Stabellini , Xen , Dave Jiang , KVM , Glauber Costa , X86 , Ingo Molnar , Rik van Riel , Konrad Rzeszutek Wilk , Greg Kroah-Hartman , Sasha Levin , Sedat Dilek , Thomas Gleixner , LKML , Dave Hansen , Suzuki Poulose S List-Id: virtualization@lists.linuxfoundation.org On 01/17/2012 01:47 AM, Avi Kivity wrote: > On 01/16/2012 04:13 PM, Raghavendra K T wrote: >>> Please drop all of these and replace with tracepoints in the appropriate >>> spots. Everything else (including the historgram) can be reconstructed >>> the tracepoints in userspace. >>> >> >> I think Jeremy pointed that tracepoints use spinlocks and hence debugfs >> is the option.. no ? >> > Yeah, I think you're right. What a pity. Yes, I went through the same thought process. J