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Re: [Xen-devel] [PATCH RFC V4 4/5] kvm : pv-ticketlocks support for linux guests running on KVM hypervisor
- To: Avi Kivity <avi@xxxxxxxxxx>
- From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- Date: Tue, 17 Jan 2012 10:49:18 +1100
- Cc: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Xen <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Glauber Costa <glommer@xxxxxxxxxx>, X86 <x86@xxxxxxxxxx>, Alexander Graf <agraf@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxx>, Sasha Levin <levinsasha928@xxxxxxxxx>, Sedat Dilek <sedat.dilek@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>, Suzuki Poulose <suzuki@xxxxxxxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Rob Landley <rlandley@xxxxxxxxxxxxx>
- Delivery-date: Wed, 18 Jan 2012 10:35:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
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
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