* Paolo Bonzini (pbonz...@redhat.com) wrote:
> From: Mark Kanda <mark.ka...@oracle.com>
>
> Add an HMP command to retrieve statistics collected at run-time.
> The command will retrieve and print either all VM-level statistics,
> or all vCPU-level statistics for the currently selected CPU.
>
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
> ---
> hmp-commands-info.hx | 13 +++
> include/monitor/hmp.h | 1 +
> monitor/hmp-cmds.c | 190 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 204 insertions(+)
>
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index 834bed089e..28757768f7 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -894,3 +894,16 @@ SRST
> ``info via``
> Show guest mos6522 VIA devices.
> ERST
> +
> + {
> + .name = "stats",
> + .args_type = "target:s",
> + .params = "target",
> + .help = "show statistics; target is either vm or vcpu",
> + .cmd = hmp_info_stats,
> + },
> +
> +SRST
> + ``stats``
> + Show runtime-collected statistics
> +ERST
> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
> index 96d014826a..2e89a97bd6 100644
> --- a/include/monitor/hmp.h
> +++ b/include/monitor/hmp.h
> @@ -133,5 +133,6 @@ void hmp_info_dirty_rate(Monitor *mon, const QDict
> *qdict);
> void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict);
> void hmp_human_readable_text_helper(Monitor *mon,
> HumanReadableText *(*qmp_handler)(Error
> **));
> +void hmp_info_stats(Monitor *mon, const QDict *qdict);
>
> #endif
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index 622c783c32..55b83c0a3a 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -40,6 +40,7 @@
> #include "qapi/qapi-commands-pci.h"
> #include "qapi/qapi-commands-rocker.h"
> #include "qapi/qapi-commands-run-state.h"
> +#include "qapi/qapi-commands-stats.h"
> #include "qapi/qapi-commands-tpm.h"
> #include "qapi/qapi-commands-ui.h"
> #include "qapi/qapi-visit-net.h"
> @@ -52,6 +53,7 @@
> #include "ui/console.h"
> #include "qemu/cutils.h"
> #include "qemu/error-report.h"
> +#include "hw/core/cpu.h"
> #include "hw/intc/intc.h"
> #include "migration/snapshot.h"
> #include "migration/misc.h"
> @@ -2239,3 +2241,191 @@ void hmp_info_memory_size_summary(Monitor *mon, const
> QDict *qdict)
> }
> hmp_handle_error(mon, err);
> }
> +
> +static void print_stats_schema_value(Monitor *mon, StatsSchemaValue *value)
> +{
> + const char *unit = NULL;
> + monitor_printf(mon, " %s (%s%s", value->name,
> StatsType_str(value->type),
> + value->has_unit || value->exponent ? ", " : "");
> +
> + if (value->has_unit) {
> + if (value->unit == STATS_UNIT_SECONDS) {
> + unit = "s";
> + } else if (value->unit == STATS_UNIT_BYTES) {
> + unit = "B";
> + }
> + }
> +
> + if (unit && value->base == 10 &&
> + value->exponent >= -9 && value->exponent <= 0 &&
> + value->exponent % 3 == 0) {
> + monitor_printf(mon, "%s", si_prefix(value->exponent));
> + } else if (unit && value->base == 2 &&
> + value->exponent >= 0 && value->exponent <= 40 &&
> + value->exponent % 10 == 0) {
> +
> + monitor_printf(mon, "%s", iec_binary_prefix(value->exponent));
OK that's better; but it's a shame the limits don't come from something
shared; iec_binary_prefix goes upto 60 and si_prefix goes way below -9
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
> + } else if (value->exponent) {
> + /* Use exponential notation and write the unit's English name */
> + monitor_printf(mon, "* %d^%d%s",
> + value->base, value->exponent,
> + value->has_unit ? " " : "");
> + unit = NULL;
> + }
> +
> + if (value->has_unit) {
> + monitor_printf(mon, "%s", unit ? unit : StatsUnit_str(value->unit));
> + }
> +
> + /* Print bucket size for linear histograms */
> + if (value->type == STATS_TYPE_LINEAR_HISTOGRAM &&
> value->has_bucket_size) {
> + monitor_printf(mon, ", bucket size=%d", value->bucket_size);
> + }
> + monitor_printf(mon, ")");
> +}
> +
> +static StatsSchemaValueList *find_schema_value_list(
> + StatsSchemaList *list, StatsProvider provider,
> + StatsTarget target)
> +{
> + StatsSchemaList *node;
> +
> + for (node = list; node; node = node->next) {
> + if (node->value->provider == provider &&
> + node->value->target == target) {
> + return node->value->stats;
> + }
> + }
> + return NULL;
> +}
> +
> +static void print_stats_results(Monitor *mon, StatsTarget target,
> + StatsResult *result,
> + StatsSchemaList *schema)
> +{
> + /* Find provider schema */
> + StatsSchemaValueList *schema_value_list =
> + find_schema_value_list(schema, result->provider, target);
> + StatsList *stats_list;
> +
> + if (!schema_value_list) {
> + monitor_printf(mon, "failed to find schema list for %s\n",
> + StatsProvider_str(result->provider));
> + return;
> + }
> +
> + monitor_printf(mon, "provider: %s\n",
> + StatsProvider_str(result->provider));
> +
> + for (stats_list = result->stats; stats_list;
> + stats_list = stats_list->next,
> + schema_value_list = schema_value_list->next) {
> +
> + Stats *stats = stats_list->value;
> + StatsValue *stats_value = stats->value;
> + StatsSchemaValue *schema_value = schema_value_list->value;
> +
> + /* Find schema entry */
> + while (!g_str_equal(stats->name, schema_value->name)) {
> + if (!schema_value_list->next) {
> + monitor_printf(mon, "failed to find schema entry for %s\n",
> + stats->name);
> + return;
> + }
> + schema_value_list = schema_value_list->next;
> + schema_value = schema_value_list->value;
> + }
> +
> + print_stats_schema_value(mon, schema_value);
> +
> + if (stats_value->type == QTYPE_QNUM) {
> + monitor_printf(mon, ": %" PRId64 "\n", stats_value->u.scalar);
> + } else if (stats_value->type == QTYPE_QLIST) {
> + uint64List *list;
> + int i;
> +
> + monitor_printf(mon, ": ");
> + for (list = stats_value->u.list, i = 1;
> + list;
> + list = list->next, i++) {
> + monitor_printf(mon, "[%d]=%" PRId64 " ", i, list->value);
> + }
> + monitor_printf(mon, "\n");
> + }
> + }
> +}
> +
> +/* Create the StatsFilter that is needed for an "info stats" invocation. */
> +static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
> +{
> + StatsFilter *filter = g_malloc0(sizeof(*filter));
> +
> + filter->target = target;
> + switch (target) {
> + case STATS_TARGET_VM:
> + break;
> + case STATS_TARGET_VCPU:
> + {
> + strList *vcpu_list = NULL;
> + CPUState *cpu = qemu_get_cpu(cpu_index);
> + char *canonical_path = object_get_canonical_path(OBJECT(cpu));
> +
> + QAPI_LIST_PREPEND(vcpu_list, canonical_path);
> + filter->u.vcpu.has_vcpus = true;
> + filter->u.vcpu.vcpus = vcpu_list;
> + break;
> + }
> + default:
> + break;
> + }
> + return filter;
> +}
> +
> +void hmp_info_stats(Monitor *mon, const QDict *qdict)
> +{
> + const char *target_str = qdict_get_str(qdict, "target");
> + StatsTarget target;
> + Error *err = NULL;
> + g_autoptr(StatsSchemaList) schema = NULL;
> + g_autoptr(StatsResultList) stats = NULL;
> + g_autoptr(StatsFilter) filter = NULL;
> + StatsResultList *entry;
> +
> + target = qapi_enum_parse(&StatsTarget_lookup, target_str, -1, &err);
> + if (err) {
> + monitor_printf(mon, "invalid stats target %s\n", target_str);
> + goto exit_no_print;
> + }
> +
> + schema = qmp_query_stats_schemas(&err);
> + if (err) {
> + goto exit;
> + }
> +
> + switch (target) {
> + case STATS_TARGET_VM:
> + filter = stats_filter(target, -1);
> + break;
> + case STATS_TARGET_VCPU: {}
> + int cpu_index = monitor_get_cpu_index(mon);
> + filter = stats_filter(target, cpu_index);
> + break;
> + default:
> + abort();
> + }
> +
> + stats = qmp_query_stats(filter, &err);
> + if (err) {
> + goto exit;
> + }
> + for (entry = stats; entry; entry = entry->next) {
> + print_stats_results(mon, target, entry->value, schema);
> + }
> +
> +exit:
> + if (err) {
> + monitor_printf(mon, "%s\n", error_get_pretty(err));
> + }
> +exit_no_print:
> + error_free(err);
> +}
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
