On 10/31/13, 2:09 AM, Masami Hiramatsu wrote:
(2013/10/30 23:03), David Ahern wrote:
On 10/29/13 11:59 PM, Masami Hiramatsu wrote:
(2013/10/29 11:58), David Ahern wrote:
To back out a bit, my end goal is to be able to create and merge
perf-events from any context on a KVM-based host -- guest u
(2013/10/30 23:03), David Ahern wrote:
> On 10/29/13 11:59 PM, Masami Hiramatsu wrote:
>> (2013/10/29 11:58), David Ahern wrote:
>>> To back out a bit, my end goal is to be able to create and merge
>>> perf-events from any context on a KVM-based host -- guest userspace,
>>> guest kernel space, host
On 10/30/13 8:20 AM, Gleb Natapov wrote:
So can you explain a little bit more about how this will work? You run
perf on a host and get both host and guest events? How do you pass
events from guest to host in this case?
The intent is to allow data capture to occur in both contexts (host and
gue
On Mon, Oct 28, 2013 at 08:58:08PM -0600, David Ahern wrote:
> On 10/28/13 7:15 AM, Peter Zijlstra wrote:
> >>Any suggestions on how to do this and without impacting performance. I
> >>noticed the MSR path seems to take about twice as long as the current
> >>implementation (which I believe results
On 10/29/13 11:59 PM, Masami Hiramatsu wrote:
(2013/10/29 11:58), David Ahern wrote:
To back out a bit, my end goal is to be able to create and merge
perf-events from any context on a KVM-based host -- guest userspace,
guest kernel space, host userspace and host kernel space (userspace
events wi
(2013/10/29 11:58), David Ahern wrote:
> On 10/28/13 7:15 AM, Peter Zijlstra wrote:
>>> Any suggestions on how to do this and without impacting performance. I
>>> noticed the MSR path seems to take about twice as long as the current
>>> implementation (which I believe results in rdtsc in the VM for
On Mon, Oct 28, 2013 at 08:58:08PM -0600, David Ahern wrote:
> To back out a bit, my end goal is to be able to create and merge perf-events
> from any context on a KVM-based host -- guest userspace, guest kernel space,
> host userspace and host kernel space (userspace events with a perf-clock
> tim
On 10/28/13 7:15 AM, Peter Zijlstra wrote:
Any suggestions on how to do this and without impacting performance. I
noticed the MSR path seems to take about twice as long as the current
implementation (which I believe results in rdtsc in the VM for x86 with
stable TSC).
So assuming all the TSCs a
On Sun, Oct 27, 2013 at 07:27:27PM -0600, David Ahern wrote:
> Often when debugging performance problems in a virtualized environment you
> need to correlate what is happening in the guest with what is happening in
> the host. To correlate events you need a common time basis (or the ability
> to di
On Sun, Oct 27, 2013 at 07:27:27PM -0600, David Ahern wrote:
> Often when debugging performance problems in a virtualized
> environment you need to correlate what is happening in the guest
> with what is happening in the host. To correlate events you need a
> common time basis (or the ability to di
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