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[PATCH v5 10/10] hmp: add filtering of statistics by name
From: |
Paolo Bonzini |
Subject: |
[PATCH v5 10/10] hmp: add filtering of statistics by name |
Date: |
Mon, 30 May 2022 17:07:14 +0200 |
Allow the user to request only a specific subset of statistics.
This can be useful when working on a feature or optimization that is
known to affect that statistic.
Extracted from a patch by Mark Kanda.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hmp-commands-info.hx | 8 ++++----
monitor/hmp-cmds.c | 35 ++++++++++++++++++++++++++---------
2 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index a67040443b..3ffa24bd67 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -897,10 +897,10 @@ ERST
{
.name = "stats",
- .args_type = "target:s,provider:s?",
- .params = "target [provider]",
- .help = "show statistics for the given target (vm or vcpu);
optionally filter by "
- "provider",
+ .args_type = "target:s,names:s?,provider:s?",
+ .params = "target [names] [provider]",
+ .help = "show statistics for the given target (vm or vcpu);
optionally filter by"
+ "name (comma-separated list, or * for all) and provider",
.cmd = hmp_info_stats,
},
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index a71887e54c..8775f69ff1 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -2359,10 +2359,12 @@ static void print_stats_results(Monitor *mon,
StatsTarget target,
}
/* Create the StatsFilter that is needed for an "info stats" invocation. */
-static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
- StatsProvider provider)
+static StatsFilter *stats_filter(StatsTarget target, const char *names,
+ int cpu_index, StatsProvider provider)
{
StatsFilter *filter = g_malloc0(sizeof(*filter));
+ StatsProvider provider_idx;
+ StatsRequestList *request_list = NULL;
filter->target = target;
switch (target) {
@@ -2383,15 +2385,29 @@ static StatsFilter *stats_filter(StatsTarget target,
int cpu_index,
break;
}
- if (provider == STATS_PROVIDER__MAX) {
+ if (!names && provider == STATS_PROVIDER__MAX) {
return filter;
}
- /* "info stats" can only query either one or all the providers. */
+ /*
+ * "info stats" can only query either one or all the providers. Querying
+ * by name, but not by provider, requires the creation of one filter per
+ * provider.
+ */
+ for (provider_idx = 0; provider_idx < STATS_PROVIDER__MAX; provider_idx++)
{
+ if (provider == STATS_PROVIDER__MAX || provider == provider_idx) {
+ StatsRequest *request = g_new0(StatsRequest, 1);
+ request->provider = provider_idx;
+ if (names && !g_str_equal(names, "*")) {
+ request->has_names = true;
+ request->names = strList_from_comma_list(names);
+ }
+ QAPI_LIST_PREPEND(request_list, request);
+ }
+ }
+
filter->has_providers = true;
- filter->providers = g_new0(StatsRequestList, 1);
- filter->providers->value = g_new0(StatsRequest, 1);
- filter->providers->value->provider = provider;
+ filter->providers = request_list;
return filter;
}
@@ -2399,6 +2415,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
{
const char *target_str = qdict_get_str(qdict, "target");
const char *provider_str = qdict_get_try_str(qdict, "provider");
+ const char *names = qdict_get_try_str(qdict, "names");
StatsProvider provider = STATS_PROVIDER__MAX;
StatsTarget target;
@@ -2429,11 +2446,11 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
switch (target) {
case STATS_TARGET_VM:
- filter = stats_filter(target, -1, provider);
+ filter = stats_filter(target, names, -1, provider);
break;
case STATS_TARGET_VCPU: {}
int cpu_index = monitor_get_cpu_index(mon);
- filter = stats_filter(target, cpu_index, provider);
+ filter = stats_filter(target, names, cpu_index, provider);
break;
default:
abort();
--
2.36.1
- [PATCH v5 01/10] qmp: Support for querying stats, (continued)
- [PATCH v5 01/10] qmp: Support for querying stats, Paolo Bonzini, 2022/05/30
- [PATCH v5 03/10] qmp: add filtering of statistics by target vCPU, Paolo Bonzini, 2022/05/30
- [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi", Paolo Bonzini, 2022/05/30
- [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes, Paolo Bonzini, 2022/05/30
- [PATCH v5 07/10] qmp: add filtering of statistics by provider, Paolo Bonzini, 2022/05/30
- [PATCH v5 06/10] hmp: add basic "info stats" implementation, Paolo Bonzini, 2022/05/30
- [PATCH v5 09/10] qmp: add filtering of statistics by name, Paolo Bonzini, 2022/05/30
- [PATCH v5 02/10] kvm: Support for querying fd-based stats, Paolo Bonzini, 2022/05/30
- [PATCH v5 10/10] hmp: add filtering of statistics by name,
Paolo Bonzini <=
- [PATCH v5 08/10] hmp: add filtering of statistics by provider, Paolo Bonzini, 2022/05/30