[PATCH] perf: Rewrite core context handling

[Ravi Bangoria]

On 29-Aug-22 8:10 PM, Peter Zijlstra wrote:
> On Mon, Aug 29, 2022 at 02:04:33PM +0200, Peter Zijlstra wrote:
>> On Mon, Aug 29, 2022 at 05:03:47PM +0530, Ravi Bangoria wrote:
>>> @@ -12598,6 +12590,7 @@ EXPORT_SYMBOL_GPL(perf_event_create_kernel_counter);
>>>  
>>>  void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
>>>  {
>>> +#if 0 // XXX buggered - cpu hotplug, who cares
>>>  	struct perf_event_context *src_ctx;
>>>  	struct perf_event_context *dst_ctx;
>>>  	struct perf_event *event, *tmp;
>>> @@ -12658,6 +12651,7 @@ void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu)
>>>  	}
>>>  	mutex_unlock(&dst_ctx->mutex);
>>>  	mutex_unlock(&src_ctx->mutex);
>>> +#endif
>>>  }
>>>  EXPORT_SYMBOL_GPL(perf_pmu_migrate_context);
>>>  
>>
>> Note to self; fix this :-) I'll see if I have time for that later today.
> 
> Urgh, while going through that it appears the whole refcounting thing
> isn't fully done either.

Not sure I follow. Can you please elaborate.

Thanks,
Ravi