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David Alan Gilbert" Subject: [PULL 08/21] qmp: add filtering of statistics by name Date: Thu, 16 Jun 2022 10:31:56 +0200 Message-Id: <20220616083209.117397-9-pbonzini@redhat.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220616083209.117397-1-pbonzini@redhat.com> References: <20220616083209.117397-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1655369630642100001 Content-Type: text/plain; charset="utf-8" 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 --- accel/kvm/kvm-all.c | 17 +++++++++++------ include/monitor/stats.h | 2 +- monitor/qmp-cmds.c | 7 ++++++- qapi/stats.json | 6 +++++- 4 files changed, 23 insertions(+), 9 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 2e819beaeb..ba3210b1c1 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -2312,7 +2312,7 @@ bool kvm_dirty_ring_enabled(void) } =20 static void query_stats_cb(StatsResultList **result, StatsTarget target, - strList *targets, Error **errp); + strList *names, strList *targets, Error **errp); static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp); =20 static int kvm_init(MachineState *ms) @@ -3713,6 +3713,7 @@ typedef struct StatsArgs { StatsResultList **stats; StatsSchemaList **schema; } result; + strList *names; Error **errp; } StatsArgs; =20 @@ -3916,7 +3917,7 @@ static StatsDescriptors *find_stats_descriptors(Stats= Target target, int stats_fd } =20 static void query_stats(StatsResultList **result, StatsTarget target, - int stats_fd, Error **errp) + strList *names, int stats_fd, Error **errp) { struct kvm_stats_desc *kvm_stats_desc; struct kvm_stats_header *kvm_stats_header; @@ -3958,6 +3959,9 @@ static void query_stats(StatsResultList **result, Sta= tsTarget target, =20 /* Add entry to the list */ stats =3D (void *)stats_data + pdesc->offset; + if (!apply_str_list_filter(pdesc->name, names)) { + continue; + } stats_list =3D add_kvmstat_entry(pdesc, stats, stats_list, errp); } =20 @@ -4019,8 +4023,8 @@ static void query_stats_vcpu(CPUState *cpu, run_on_cp= u_data data) error_propagate(kvm_stats_args->errp, local_err); return; } - query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd, - kvm_stats_args->errp); + query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, + kvm_stats_args->names, stats_fd, kvm_stats_args->errp); close(stats_fd); } =20 @@ -4041,7 +4045,7 @@ static void query_stats_schema_vcpu(CPUState *cpu, ru= n_on_cpu_data data) } =20 static void query_stats_cb(StatsResultList **result, StatsTarget target, - strList *targets, Error **errp) + strList *names, strList *targets, Error **errp) { KVMState *s =3D kvm_state; CPUState *cpu; @@ -4055,7 +4059,7 @@ static void query_stats_cb(StatsResultList **result, = StatsTarget target, error_setg_errno(errp, errno, "KVM stats: ioctl failed"); return; } - query_stats(result, target, stats_fd, errp); + query_stats(result, target, names, stats_fd, errp); close(stats_fd); break; } @@ -4063,6 +4067,7 @@ static void query_stats_cb(StatsResultList **result, = StatsTarget target, { StatsArgs stats_args; stats_args.result.stats =3D result; + stats_args.names =3D names; stats_args.errp =3D errp; CPU_FOREACH(cpu) { if (!apply_str_list_filter(cpu->parent_obj.canonical_path, tar= gets)) { 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" =20 typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target, - strList *targets, Error **errp); + strList *names, strList *targets, Error **er= rp); typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp); =20 /* diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c index e49ab345d7..7314cd813d 100644 --- a/monitor/qmp-cmds.c +++ b/monitor/qmp-cmds.c @@ -472,12 +472,17 @@ static bool invoke_stats_cb(StatsCallbacks *entry, Error **errp) { strList *targets =3D NULL; + strList *names =3D NULL; ERRP_GUARD(); =20 if (request) { if (request->provider !=3D entry->provider) { return true; } + if (request->has_names && !request->names) { + return true; + } + names =3D request->has_names ? request->names : NULL; } =20 switch (filter->target) { @@ -496,7 +501,7 @@ static bool invoke_stats_cb(StatsCallbacks *entry, abort(); } =20 - entry->stats_cb(stats_results, filter->target, targets, errp); + entry->stats_cb(stats_results, filter->target, names, targets, errp); if (*errp) { qapi_free_StatsResultList(*stats_results); *stats_results =3D NULL; diff --git a/qapi/stats.json b/qapi/stats.json index 503918ea4c..2f8bfe8fdb 100644 --- a/qapi/stats.json +++ b/qapi/stats.json @@ -75,11 +75,14 @@ # Indicates a set of statistics that should be returned by query-stats. # # @provider: provider for which to return statistics. + +# @names: statistics to be returned (all if omitted). # # Since: 7.1 ## { 'struct': 'StatsRequest', - 'data': { 'provider': 'StatsProvider' } } + 'data': { 'provider': 'StatsProvider', + '*names': [ 'str' ] } } =20 ## # @StatsVCPUFilter: @@ -99,6 +102,7 @@ # that target: # - which vCPUs to request statistics for # - which providers to request statistics from +# - which named values to return within each provider # # Since: 7.1 ## --=20 2.36.1