dragonball: add metrics system

metrics system is added for collecting Dragonball metrics to analyze the
system.

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>
Signed-off-by: jingshan <jingshan@linux.alibaba.com>
Signed-off-by: Chao Wu <chaowu@linux.alibaba.com>
Signed-off-by: wllenyj <wllenyj@linux.alibaba.com>

src/dragonball/Cargo.toml

@@ -22,6 +22,7 @@ dbs-utils = "0.1.0"
 dbs-virtio-devices = { version = "0.1.0", optional = true, features = ["virtio-mmio"] }
 kvm-bindings = "0.5.0"
 kvm-ioctls = "0.11.0"
+lazy_static = "1.2"
 libc = "0.2.39"
 linux-loader = "0.4.0"
 log = "0.4.14"

src/dragonball/src/lib.rs

@@ -17,6 +17,8 @@ pub mod config_manager;
 pub mod device_manager;
 /// Errors related to Virtual machine manager.
 pub mod error;
+/// Metrics system.
+pub mod metric;
 /// Resource manager for virtual machines.
 pub mod resource_manager;
 /// Virtual machine manager for virtual machines.

src/dragonball/src/metric.rs

@@ -0,0 +1,39 @@
+// Copyright (C) 2022 Alibaba Cloud. All rights reserved.
+// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+use dbs_utils::metric::SharedIncMetric;
+use lazy_static::lazy_static;
+use serde::Serialize;
+
+pub use dbs_utils::metric::IncMetric;
+
+lazy_static! {
+    /// Static instance used for handling metrics.
+    pub static ref METRICS: DragonballMetrics = DragonballMetrics::default();
+}
+
+/// Metrics for the seccomp filtering.
+#[derive(Default, Serialize)]
+pub struct SeccompMetrics {
+    /// Number of errors inside the seccomp filtering.
+    pub num_faults: SharedIncMetric,
+}
+
+/// Metrics related to signals.
+#[derive(Default, Serialize)]
+pub struct SignalMetrics {
+    /// Number of times that SIGBUS was handled.
+    pub sigbus: SharedIncMetric,
+    /// Number of times that SIGSEGV was handled.
+    pub sigsegv: SharedIncMetric,
+}
+
+/// Structure storing all metrics while enforcing serialization support on them.
+#[derive(Default, Serialize)]
+pub struct DragonballMetrics {
+    /// Metrics related to seccomp filtering.
+    pub seccomp: SeccompMetrics,
+    /// Metrics related to signals.
+    pub signals: SignalMetrics,
+}