From cf7405bc0228c795557e19bacbaa3b145bb17370 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Tue, 24 May 2022 19:13:16 +0200 Subject: qmp: add filtering of statistics by name Allow retrieving only a subset of statistics. This can be useful for example in order to plot a subset of the statistics many times a second: KVM publishes ~40 statistics for each vCPU on x86; retrieving and serializing all of them would be useless. Another use will be in HMP in the following patch; implementing the filter in the backend is easy enough that it was deemed okay to make this a public interface. Example: { "execute": "query-stats", "arguments": { "target": "vcpu", "vcpus": [ "/machine/unattached/device[2]", "/machine/unattached/device[4]" ], "providers": [ { "provider": "kvm", "names": [ "l1d_flush", "exits" ] } } } { "return": { "vcpus": [ { "path": "/machine/unattached/device[2]" "providers": [ { "provider": "kvm", "stats": [ { "name": "l1d_flush", "value": 41213 }, { "name": "exits", "value": 74291 } ] } ] }, { "path": "/machine/unattached/device[4]" "providers": [ { "provider": "kvm", "stats": [ { "name": "l1d_flush", "value": 16132 }, { "name": "exits", "value": 57922 } ] } ] } ] } } Extracted from a patch by Mark Kanda. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Paolo Bonzini --- include/monitor/stats.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include') diff --git a/include/monitor/stats.h b/include/monitor/stats.h index 80a523dd29..fcf0983154 100644 --- a/include/monitor/stats.h +++ b/include/monitor/stats.h @@ -11,7 +11,7 @@ #include "qapi/qapi-types-stats.h" typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target, - strList *targets, Error **errp); + strList *names, strList *targets, Error **errp); typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp); /* -- cgit v1.2.3-55-g7522