I ran into a similar problem with my PEBS virtualization patchkit.
My solution was: basically schedule as normal, but tell the scheduler to
force allocate a counter on a specific index. It can be done
only with a few lines of change in the scheduler code.
-Andi
I ran into a similar problem with my PEBS virtualization patchkit.
My solution was: basically schedule as normal, but tell the scheduler to
force allocate a counter on a specific index. It can be done
only with a few lines of change in the scheduler code.
-Andi
Please; don't send malformed emails like this. Lines wrap at 78 chars.
On Mon, Nov 05, 2018 at 03:37:24PM +, Wang, Wei W wrote:
> On Monday, November 5, 2018 8:14 PM, Peter Zijlstra wrote:
> > That can only work if the host counter has perf_event_attr::exclude_guest=1,
> > any counter
Please; don't send malformed emails like this. Lines wrap at 78 chars.
On Mon, Nov 05, 2018 at 03:37:24PM +, Wang, Wei W wrote:
> On Monday, November 5, 2018 8:14 PM, Peter Zijlstra wrote:
> > That can only work if the host counter has perf_event_attr::exclude_guest=1,
> > any counter
On Monday, November 5, 2018 8:14 PM, Peter Zijlstra wrote:
> The answer for PEBS is really simple; PEBS does not virtualize (Andi tried and
> can tell you why; IIRC it has something to do with how the hardware asks for
> a Linear Address instead of a Physical Address). So the problem will not
>
On Monday, November 5, 2018 8:14 PM, Peter Zijlstra wrote:
> The answer for PEBS is really simple; PEBS does not virtualize (Andi tried and
> can tell you why; IIRC it has something to do with how the hardware asks for
> a Linear Address instead of a Physical Address). So the problem will not
>
On Mon, Nov 05, 2018 at 07:19:01PM +0800, Wei Wang wrote:
> On 11/05/2018 05:34 PM, Peter Zijlstra wrote:
> > On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
> > > On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
> > > > > @@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched
>
On Mon, Nov 05, 2018 at 07:19:01PM +0800, Wei Wang wrote:
> On 11/05/2018 05:34 PM, Peter Zijlstra wrote:
> > On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
> > > On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
> > > > > @@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched
>
On 11/05/2018 05:34 PM, Peter Zijlstra wrote:
On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
@@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched *sched,
struct event_constraint **
sched->max_weight= wmax;
On 11/05/2018 05:34 PM, Peter Zijlstra wrote:
On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
@@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched *sched,
struct event_constraint **
sched->max_weight= wmax;
On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
> On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
> > > @@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched *sched,
> > > struct event_constraint **
> > > sched->max_weight = wmax;
> > > sched->max_gp
On Fri, Nov 02, 2018 at 05:08:31PM +0800, Wei Wang wrote:
> On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
> > > @@ -723,6 +724,9 @@ static void perf_sched_init(struct perf_sched *sched,
> > > struct event_constraint **
> > > sched->max_weight = wmax;
> > > sched->max_gp
On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
On Thu, Nov 01, 2018 at 06:04:01PM +0800, Wei Wang wrote:
Add x86_perf_mask_perf_counters to reserve counters from the host perf
subsystem. The masked counters will not be assigned to any host perf
events. This can be used by the hypervisor to
On 11/01/2018 10:52 PM, Peter Zijlstra wrote:
On Thu, Nov 01, 2018 at 06:04:01PM +0800, Wei Wang wrote:
Add x86_perf_mask_perf_counters to reserve counters from the host perf
subsystem. The masked counters will not be assigned to any host perf
events. This can be used by the hypervisor to
On Thu, Nov 01, 2018 at 06:04:01PM +0800, Wei Wang wrote:
> Add x86_perf_mask_perf_counters to reserve counters from the host perf
> subsystem. The masked counters will not be assigned to any host perf
> events. This can be used by the hypervisor to reserve perf counters for
> a guest to use.
>
>
On Thu, Nov 01, 2018 at 06:04:01PM +0800, Wei Wang wrote:
> Add x86_perf_mask_perf_counters to reserve counters from the host perf
> subsystem. The masked counters will not be assigned to any host perf
> events. This can be used by the hypervisor to reserve perf counters for
> a guest to use.
>
>
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