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qmp: add filtering of statistics by provider

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Allow retrieving the statistics from a specific provider only.
This can be used in the future by HMP commands such as "info
sync-profile" or "info profile".  The next patch also adds
filter-by-provider capabilities to the HMP equivalent of
query-stats, "info stats".

Example:

{ "execute": "query-stats",
  "arguments": {
    "target": "vm",
    "providers": [
      { "provider": "kvm" } ] } }

The QAPI is a bit more verbose than just a list of StatsProvider,
so that it can be subsequently extended with filtering of statistics
by name.

If a provider is specified more than once in the filter, each request
will be included separately in the output.

Extracted from a patch by Mark Kanda.

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-04-26 11:49:33 +02:00
parent 433815f5bd
commit 068cc51d42
5 changed files with 55 additions and 14 deletions
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4
include/monitor/stats.h
View file

@ -17,10 +17,12 @@ typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
/*
* Register callbacks for the QMP query-stats command.
*
* @provider: stats provider checked against QMP command arguments
* @stats_fn: routine to query stats:
* @schema_fn: routine to query stat schemas:
*/
void add_stats_callbacks(StatRetrieveFunc *stats_fn,
void add_stats_callbacks(StatsProvider provider,
StatRetrieveFunc *stats_fn,
SchemaRetrieveFunc *schemas_fn);
/*