new(cmake,userspace): expose jemalloc stats in stats writer and prometheus metircs.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

cmake/modules/jemalloc.cmake

@@ -15,9 +15,10 @@
 
 option(USE_BUNDLED_JEMALLOC "Use bundled jemalloc allocator" ${USE_BUNDLED_DEPS})
 
-if(JEMALLOC_LIB)
+if(JEMALLOC_INCLUDE)
 	# we already have JEMALLOC
 elseif(NOT USE_BUNDLED_JEMALLOC)
+	find_path(JEMALLOC_INCLUDE jemalloc/jemalloc.h)
 	if(BUILD_SHARED_LIBS)
 		set(JEMALLOC_LIB_SUFFIX ${CMAKE_SHARED_LIBRARY_SUFFIX})
 	else()
@@ -37,6 +38,7 @@ else()
 	endif()
 	set(JEMALLOC_SRC "${PROJECT_BINARY_DIR}/jemalloc-prefix/src")
 	set(JEMALLOC_LIB "${JEMALLOC_SRC}/jemalloc/lib/libjemalloc${JEMALLOC_LIB_SUFFIX}")
+	set(JEMALLOC_INCLUDE "${JEMALLOC_SRC}/jemalloc/include/jemalloc")
 	ExternalProject_Add(
 		jemalloc
 		PREFIX "${PROJECT_BINARY_DIR}/jemalloc-prefix"
@@ -49,7 +51,7 @@ else()
 		UPDATE_COMMAND ""
 		BUILD_BYPRODUCTS ${JEMALLOC_LIB}
 	)
-	message(STATUS "Using bundled jemalloc: lib: ${JEMALLOC_LIB}")
+	message(STATUS "Using bundled jemalloc: include: ${JEMALLOC_INCLUDE}, lib: ${JEMALLOC_LIB}")
 	install(
 		FILES "${JEMALLOC_LIB}"
 		DESTINATION "${CMAKE_INSTALL_LIBDIR}/${LIBS_PACKAGE_NAME}"
@@ -62,3 +64,6 @@ endif()
 if(NOT TARGET jemalloc)
 	add_custom_target(jemalloc)
 endif()
+
+include_directories(${JEMALLOC_INCLUDE})
+add_compile_definitions(HAS_JEMALLOC)

falco.yaml

@@ -1136,6 +1136,7 @@ metrics:
   kernel_event_counters_per_cpu_enabled: false
   libbpf_stats_enabled: true
   plugins_metrics_enabled: true
+  jemalloc_stats_enabled: false
   convert_memory_to_mb: true
   include_empty_values: false
 

userspace/falco/config_json_schema.h

@@ -575,6 +575,9 @@ const char config_schema_string[] = LONG_STRING_CONST(
                 },
                 "include_empty_values": {
                     "type": "boolean"
+                },
+                "jemalloc_stats_enabled": {
+                    "type": "boolean"
                 }
             },
             "minProperties": 1,

userspace/falco/configuration.cpp

@@ -611,6 +611,9 @@ void falco_configuration::load_yaml(const std::string &config_name) {
 	if(m_config.get_scalar<bool>("metrics.plugins_metrics_enabled", true)) {
 		m_metrics_flags |= METRICS_V2_PLUGINS;
 	}
+	if(m_config.get_scalar<bool>("metrics.jemalloc_stats_enabled", true)) {
+		m_metrics_flags |= METRICS_V2_JEMALLOC_STATS;
+	}
 
 	m_metrics_convert_memory_to_mb =
 	        m_config.get_scalar<bool>("metrics.convert_memory_to_mb", true);

userspace/falco/configuration.h

@@ -37,6 +37,9 @@ limitations under the License.
 #include "event_drops.h"
 #include "falco_outputs.h"
 
+// Falco only metric
+#define METRICS_V2_JEMALLOC_STATS 1 << 31
+
 enum class engine_kind_t : uint8_t { KMOD, EBPF, MODERN_EBPF, REPLAY, GVISOR, NODRIVER };
 
 // Map that holds { config filename | validation status } for each loaded config file.

userspace/falco/falco_metrics.cpp

@@ -23,6 +23,10 @@ limitations under the License.
 
 #include <libsinsp/sinsp.h>
 
+#ifdef HAS_JEMALLOC
+#include <jemalloc.h>
+#endif
+
 namespace fs = std::filesystem;
 
 /*!
@@ -249,6 +253,38 @@ std::string falco_metrics::to_text(const falco::app::state& state) {
 				}
 			}
 		}
+#ifdef HAS_JEMALLOC
+		if(state.config->m_metrics_flags & METRICS_V2_JEMALLOC_STATS) {
+			nlohmann::json j;
+			malloc_stats_print(
+			        [](void* to, const char* from) {
+				        nlohmann::json* j = (nlohmann::json*)to;
+				        *j = nlohmann::json::parse(from);
+			        },
+			        &j,
+			        "Jmdablxeg");
+			const auto& j_stats = j["jemalloc"]["stats"];
+			for(auto it = j_stats.begin(); it != j_stats.end(); ++it) {
+				if(it.value().is_number_unsigned()) {
+					std::uint64_t val = it.value().template get<std::uint64_t>();
+					std::string key = "jemalloc." + it.key();
+					auto metric = libs::metrics::libsinsp_metrics::new_metric(
+					        key.c_str(),
+					        METRICS_V2_JEMALLOC_STATS,
+					        METRIC_VALUE_TYPE_U64,
+					        METRIC_VALUE_UNIT_MEMORY_BYTES,
+					        METRIC_VALUE_METRIC_TYPE_MONOTONIC,
+					        val);
+					prometheus_metrics_converter.convert_metric_to_unit_convention(metric);
+					prometheus_text +=
+					        prometheus_metrics_converter.convert_metric_to_text_prometheus(
+					                metric,
+					                "falcosecurity",
+					                "falco");
+				}
+			}
+		}
+#endif
 	}
 
 	// Libs metrics categories

userspace/falco/stats_writer.cpp

@@ -32,6 +32,10 @@ limitations under the License.
 #include <libscap/strl.h>
 #include <libscap/scap_vtable.h>
 
+#ifdef HAS_JEMALLOC
+#include <jemalloc.h>
+#endif
+
 namespace fs = std::filesystem;
 
 // note: ticker_t is an uint16_t, which is enough because we don't care about
@@ -434,6 +438,43 @@ void stats_writer::collector::get_metrics_output_fields_additional(
 		}
 	}
 
+#ifdef HAS_JEMALLOC
+	if(m_writer->m_config->m_metrics_flags & METRICS_V2_JEMALLOC_STATS) {
+		nlohmann::json j;
+		malloc_stats_print(
+		        [](void* to, const char* from) {
+			        nlohmann::json* j = (nlohmann::json*)to;
+			        *j = nlohmann::json::parse(from);
+		        },
+		        &j,
+		        "Jmdablxeg");
+		const auto& j_stats = j["jemalloc"]["stats"];
+		for(auto it = j_stats.begin(); it != j_stats.end(); ++it) {
+			if(it.value().is_number_unsigned()) {
+				std::uint64_t val = it.value().template get<std::uint64_t>();
+				if(m_writer->m_config->m_metrics_include_empty_values || val != 0) {
+					std::string key = "falco.jemalloc." + it.key() + "_bytes";
+					auto metric = libs::metrics::libsinsp_metrics::new_metric(
+					        key.c_str(),
+					        METRICS_V2_JEMALLOC_STATS,
+					        METRIC_VALUE_TYPE_U64,
+					        METRIC_VALUE_UNIT_MEMORY_BYTES,
+					        METRIC_VALUE_METRIC_TYPE_MONOTONIC,
+					        val);
+					if(m_writer->m_config->m_metrics_convert_memory_to_mb &&
+					   m_writer->m_output_rule_metrics_converter) {
+						m_writer->m_output_rule_metrics_converter
+						        ->convert_metric_to_unit_convention(metric);
+						output_fields[metric.name] = metric.value.d;
+					} else {
+						output_fields[metric.name] = metric.value.u64;
+					}
+				}
+			}
+		}
+	}
+#endif
+
 #if defined(__linux__) and !defined(MINIMAL_BUILD) and !defined(__EMSCRIPTEN__)
 	if(m_writer->m_libs_metrics_collector && m_writer->m_output_rule_metrics_converter) {
 		// Libs metrics categories