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profiling: enable to capture dropped samples while buffering

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Since the profiling utilizes the limited size of buffer to capture
sample data, dropping samples could happen while collecting data
if data is generated faster than flushing by consumer. Capturing
the dropped sample info is critical to understand how much the data
is reliable to use.

To capture the information, the new hypercall "PROFILING_GET_STATUS"
is introduced.

Tracked-On: #2474
Signed-off-by: Manisha Chinthapally <manisha.chinthapally@intel.com>
Signed-off-by: Min Lim <min.yeol.lim@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Min Lim
2019-01-30 16:02:15 -08:00
committed by wenlingz
parent 18b04451e1
commit ec4dd2284c
4 changed files with 54 additions and 9 deletions
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50
hypervisor/debug/profiling.c
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@@ -788,14 +788,6 @@ static void profiling_stop_pmu(void)
__func__, i, per_cpu(profiling_info.sep_state, i).samples_logged,
per_cpu(profiling_info.sep_state, i).samples_dropped);
per_cpu(profiling_info.sep_state, i).samples_logged = 0U;
per_cpu(profiling_info.sep_state, i).samples_dropped = 0U;
per_cpu(profiling_info.sep_state, i).valid_pmi_count = 0U;
per_cpu(profiling_info.sep_state, i).total_pmi_count = 0U;
per_cpu(profiling_info.sep_state, i).total_vmexit_count = 0U;
per_cpu(profiling_info.sep_state, i).frozen_well = 0U;
per_cpu(profiling_info.sep_state, i).frozen_delayed = 0U;
per_cpu(profiling_info.sep_state, i).nofrozen_pmi = 0U;
}
smp_call_function(get_active_pcpu_bitmap(), profiling_ipi_handler, NULL);
@@ -1268,6 +1260,43 @@ int32_t profiling_get_pcpu_id(struct acrn_vm *vm, uint64_t addr)
return 0;
}
/*
* Update collection statictics
*/
int32_t profiling_get_status_info(struct acrn_vm *vm, uint64_t gpa)
{
uint16_t i;
uint16_t pcpu_nums = get_pcpu_nums();
struct profiling_status pstats[pcpu_nums];
(void)memset((void *)&pstats, 0U, pcpu_nums*sizeof(struct profiling_status));
dev_dbg(ACRN_DBG_PROFILING, "%s: entering", __func__);
if (copy_from_gpa(vm, &pstats, gpa,
pcpu_nums*sizeof(struct profiling_status)) != 0) {
pr_err("%s: Unable to copy addr from vm\n", __func__);
return -EINVAL;
}
for (i = 0U; i < pcpu_nums; i++) {
pstats[i].samples_logged =
per_cpu(profiling_info.sep_state, i).samples_logged;
pstats[i].samples_dropped =
per_cpu(profiling_info.sep_state, i).samples_dropped;
}
if (copy_to_gpa(vm, &pstats, gpa,
pcpu_nums*sizeof(struct profiling_status)) != 0) {
pr_err("%s: Unable to copy param to vm\n", __func__);
return -EINVAL;
}
dev_dbg(ACRN_DBG_PROFILING, "%s: exiting", __func__);
return 0;
}
/*
* IPI interrupt handler function
*/
@@ -1411,6 +1440,11 @@ void profiling_setup(void)
per_cpu(profiling_info.sep_state, cpu).total_vmexit_count = 0U;
per_cpu(profiling_info.sep_state, cpu).pmu_state = PMU_INITIALIZED;
per_cpu(profiling_info.sep_state, cpu).vmexit_msr_cnt = 0;
per_cpu(profiling_info.sep_state, cpu).samples_logged = 0U;
per_cpu(profiling_info.sep_state, cpu).samples_dropped = 0U;
per_cpu(profiling_info.sep_state, cpu).frozen_well = 0U;
per_cpu(profiling_info.sep_state, cpu).frozen_delayed = 0U;
per_cpu(profiling_info.sep_state, cpu).nofrozen_pmi = 0U;
msr_write(MSR_IA32_EXT_APIC_LVT_PMI,
VECTOR_PMI | LVT_PERFCTR_BIT_MASK);