Perf plugin (#6225)

* Add perf plugin skeleton * Initialize events * Collect data * Configure default counters * Add charts for hardware and software counters * Add charts for cache counters * Don't show zeroes for non-existent metrics * Reinit events when stalled * Do not reinit disabled events * Update the documentation * Scale values when multiplexing is happening
2025-04-13 09:11:50 +00:00 · 2019-06-20 15:23:29 +03:00 · 2019-06-20 15:23:29 +03:00 · 21cd00c84a
commit 21cd00c84a
parent fe8279c31d
15 changed files with 1515 additions and 15 deletions
--- a/.gitignore
+++ b/.gitignore
@ -56,6 +56,9 @@ nfacct.plugin
 xenstat.plugin
 !xenstat.plugin/

+perf.plugin
+!perf.plugin/
+
 cgroup-network
 !cgroup-network/

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -370,6 +370,10 @@ set(XENSTAT_PLUGIN_FILES
        collectors/xenstat.plugin/xenstat_plugin.c
        )

+set(PERF_PLUGIN_FILES
+        collectors/perf.plugin/perf_plugin.c
+        )
+
 set(PROC_PLUGIN_FILES
        collectors/proc.plugin/ipc.c
        collectors/proc.plugin/plugin_proc.c
@ -678,6 +682,7 @@ IF(LINUX)

    SET(ENABLE_PLUGIN_CGROUP_NETWORK True)
    SET(ENABLE_PLUGIN_APPS True)
+    SET(ENABLE_PLUGIN_PERF True)

 ELSEIF(FREEBSD)
    add_executable(netdata config.h ${NETDATA_FILES} ${FREEBSD_PLUGIN_FILES})
@ -686,6 +691,7 @@ ELSEIF(FREEBSD)
    target_compile_options(netdata PUBLIC ${NETDATA_COMMON_CFLAGS})
    SET(ENABLE_PLUGIN_CGROUP_NETWORK False)
    SET(ENABLE_PLUGIN_APPS True)
+    SET(ENABLE_PLUGIN_PERF False)

 ELSEIF(MACOS)
    add_executable(netdata config.h ${NETDATA_FILES} ${MACOS_PLUGIN_FILES})
@ -694,6 +700,7 @@ ELSEIF(MACOS)
    target_compile_options(netdata PUBLIC ${NETDATA_COMMON_CFLAGS})
    SET(ENABLE_PLUGIN_CGROUP_NETWORK False)
    SET(ENABLE_PLUGIN_APPS False)
+    SET(ENABLE_PLUGIN_PERF False)

 ENDIF()

@ -777,6 +784,20 @@ ELSE()
 ENDIF()


+# -----------------------------------------------------------------------------
+# perf.plugin
+
+IF(ENABLE_PLUGIN_PERF)
+    message(STATUS "perf.plugin: enabled")
+    add_executable(perf.plugin config.h ${PERF_PLUGIN_FILES})
+    target_link_libraries (perf.plugin libnetdata ${NETDATA_COMMON_LIBRARIES})
+    target_include_directories(perf.plugin PUBLIC ${NETDATA_COMMON_INCLUDE_DIRS})
+    target_compile_options(perf.plugin PUBLIC ${NETDATA_COMMON_CFLAGS})
+ELSE()
+    message(STATUS "perf.plugin: disabled")
+ENDIF()
+
+
 # -----------------------------------------------------------------------------
 # cgroup-network

--- a/Makefile.am
+++ b/Makefile.am
@ -234,6 +234,11 @@ XENSTAT_PLUGIN_FILES = \
    $(LIBNETDATA_FILES) \
    $(NULL)

+PERF_PLUGIN_FILES = \
+    collectors/perf.plugin/perf_plugin.c \
+    $(LIBNETDATA_FILES) \
+    $(NULL)
+
 PROC_PLUGIN_FILES = \
 	collectors/proc.plugin/ipc.c \
 	collectors/proc.plugin/plugin_proc.c \
@ -573,6 +578,14 @@ if ENABLE_PLUGIN_XENSTAT
        $(NULL)
 endif

+if ENABLE_PLUGIN_PERF
+    plugins_PROGRAMS += perf.plugin
+    perf_plugin_SOURCES = $(PERF_PLUGIN_FILES)
+    perf_plugin_LDADD = \
+        $(NETDATA_COMMON_LIBS) \
+        $(NULL)
+endif
+
 if ENABLE_BACKEND_KINESIS
    netdata_SOURCES += $(KINESIS_BACKEND_FILES)
    netdata_LDADD += $(OPTIONAL_KINESIS_LIBS)
--- a/collectors/Makefile.am
+++ b/collectors/Makefile.am
@ -18,6 +18,7 @@ SUBDIRS = \
    macos.plugin \
    nfacct.plugin \
    xenstat.plugin \
+    perf.plugin \
    node.d.plugin \
    proc.plugin \
    python.d.plugin \
--- a/collectors/README.md
+++ b/collectors/README.md
@ -37,6 +37,7 @@ plugin|lang|O/S|runs as|modular|description
 [macos.plugin](macos.plugin/)|`C`|macos|internal|yes|collects resource usage and performance data on MacOS systems
 [nfacct.plugin](nfacct.plugin/)|`C`|linux|external|-|collects netfilter firewall, connection tracker and accounting metrics using `libmnl` and `libnetfilter_acct`
 [xenstat.plugin](xenstat.plugin/)|`C`|linux|external|-|collects XenServer and XCP-ng metrics using `libxenstat`
+[perf.plugin](perf.plugin/)|`C`|linux|external|-|collects CPU performance metrics using performance monitoring units (PMU).
 [node.d.plugin](node.d.plugin/)|`node.js`|any|external|yes|a **plugin orchestrator** for data collection modules written in `node.js`.
 [plugins.d](plugins.d/)|`C`|any|internal|-|implements the **external plugins** API and serves external plugins
 [proc.plugin](proc.plugin/)|`C`|linux|internal|yes|collects resource usage and performance data on Linux systems
--- a/collectors/apps.plugin/apps_groups.conf
+++ b/collectors/apps.plugin/apps_groups.conf
@ -77,6 +77,7 @@ freeipmi.plugin: freeipmi.plugin
 nfacct.plugin: nfacct.plugin
 cups.plugin: cups.plugin
 xenstat.plugin: xenstat.plugin
+perf.plugin: perf.plugin
 charts.d.plugin: *charts.d.plugin*
 node.d.plugin: *node.d.plugin*
 python.d.plugin: *python.d.plugin*
--- a/collectors/perf.plugin/Makefile.am
+++ b/collectors/perf.plugin/Makefile.am
@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+	README.md \
+	$(NULL)
--- a/collectors/perf.plugin/README.md
+++ b/collectors/perf.plugin/README.md
@ -0,0 +1,72 @@
+# perf.plugin
+
+`perf.plugin` collects system-wide CPU performance statistics from Performance Monitoring Units (PMU) using
+the `perf_event_open()` system call.
+
+## Important Notes
+
+Accessing hardware PMUs requires root permissions, so the plugin is setuid to root.
+
+Keep in mind that the number of PMUs in a system is usually quite limited and every hardware monitoring
+event for every CPU core needs a separate file descriptor to be opened.
+
+## Charts
+
+The plugin provides statistics for general hardware and software performance monitoring events:
+
+Hardware events:
+1.  CPU cycles
+2.  Instructions
+3.  Branch instructions
+4.  Cache operations
+5.  BUS cycles
+6.  Stalled frontend and backend cycles
+
+Software events:
+1.  CPU migrations
+2.  Alignment faults
+3.  Emulation faults
+
+Hardware cache events:
+1.  L1D cache operations
+2.  L1D prefetch cache operations
+3.  L1I cache operations
+4.  LL cache operations
+5.  DTLB cache operations
+6.  ITLB cache operations
+7.  PBU cache operations
+
+## Configuration
+
+The plugin is disabled by default because the number of PMUs is usually quite limited and it is not desired to
+allow Netdata to struggle silently for PMUs, interfering with other performance monitoring software. If you need to
+enable the perf plugin, edit /etc/netdata/netdata.conf and set:
+
+```raw
+[plugins]
+    perf = yes
+```
+
+```raw
+[plugin:perf]
+    update every = 1
+    command options = all
+```
+
+You can use the `command options` parameter to pick what data should be collected and which charts should be
+displayed. If `all` is used, all general performance monitoring counters are probed and corresponding charts
+are enabled for the available counters. You can also define a particular set of enabled charts using the
+following keywords: `cycles`, `instructions`, `branch`, `cache`, `bus`, `stalled`, `migrations`, `alighnment`,
+`emulation`, `L1D`, `L1D-prefetch`, `L1I`, `LL`, `DTLB`, `ITLB`, `PBU`.
+
+## Debugging
+
+You can run the plugin by hand:
+
+```raw
+sudo /usr/libexec/netdata/plugins.d/perf.plugin 1 all debug
+```
+
+You will get verbose output on what the plugin does.
+
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fcollectors%2Fperf.plugin%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
--- a/collectors/perf.plugin/perf_plugin.c
+++ b/collectors/perf.plugin/perf_plugin.c
--- a/collectors/plugins.d/README.md
+++ b/collectors/plugins.d/README.md
@ -15,6 +15,7 @@ plugin|language|O/S|description
 [freeipmi.plugin](../freeipmi.plugin/)|`C`|linux|collects metrics from enterprise hardware sensors, on Linux servers.
 [nfacct.plugin](../nfacct.plugin/)|`C`|linux|collects netfilter firewall, connection tracker and accounting metrics using `libmnl` and `libnetfilter_acct`.
 [xenstat.plugin](../xenstat.plugin/)|`C`|linux|collects XenServer and XCP-ng metrics using `lxenstat`.
+[perf.plugin](../perf.plugin/)|`C`|linux|collects CPU performance metrics using performance monitoring units (PMU).
 [node.d.plugin](../node.d.plugin/)|`node.js`|all|a **plugin orchestrator** for data collection modules written in `node.js`.
 [python.d.plugin](../python.d.plugin/)|`python`|all|a **plugin orchestrator** for data collection modules written in `python` v2 or v3 (both are supported).

--- a/configure.ac
+++ b/configure.ac
@ -685,6 +685,19 @@ AC_MSG_RESULT([${enable_plugin_xenstat}])
 AM_CONDITIONAL([ENABLE_PLUGIN_XENSTAT], [test "${enable_plugin_xenstat}" = "yes"])


+# -----------------------------------------------------------------------------
+# perf.plugin
+
+AC_MSG_CHECKING([if perf.plugin should be enabled])
+if test "${build_target}" == "linux" ; then
+    enable_plugin_perf="yes"
+else
+    enable_plugin_perf="no"
+fi
+AC_MSG_RESULT([${enable_plugin_perf}])
+AM_CONDITIONAL([ENABLE_PLUGIN_PERF], [test "${enable_plugin_perf}" = "yes"])
+
+
 # -----------------------------------------------------------------------------
 # AWS Kinesis backend - libaws-cpp-sdk-kinesis, libaws-cpp-sdk-core, libssl, libcrypto, libcurl

@ -999,6 +1012,7 @@ AC_CONFIG_FILES([
    collectors/statsd.plugin/Makefile
    collectors/tc.plugin/Makefile
    collectors/xenstat.plugin/Makefile
+    collectors/perf.plugin/Makefile
    daemon/Makefile
    database/Makefile
    database/engine/Makefile
--- a/docs/Add-more-charts-to-netdata.md
+++ b/docs/Add-more-charts-to-netdata.md
@ -69,6 +69,7 @@ To control which plugins Netdata run, edit `netdata.conf` and check the `[plugin
 	# charts.d = yes
 	# apps = yes
 	# xenstat = yes
+	# perf = no
 ```

 The default for all plugins is the option `enable running new plugins`. So, setting this to `no` will disable all the plugins, except the ones specifically enabled.
@ -95,7 +96,7 @@ sudo su -s /bin/bash netdata
 ```

 Similarly, you can use `charts.d.plugin` for BASH plugins and `node.d.plugin` for node.js plugins.
-Other plugins (like `apps.plugin`, `freeipmi.plugin`, `fping.plugin`, `ioping.plugin`) use the native Netdata plugin API and can be run directly.
+Other plugins (like `apps.plugin`, `freeipmi.plugin`, `fping.plugin`, `ioping.plugin`, `nfacct.plugin`, `xenstat.plugin`, `perf.plugin`) use the native Netdata plugin API and can be run directly.

 If you need to configure a Netdata plugin or module, all user supplied configuration is kept at `/etc/netdata` while the stock versions of all files is at `/usr/lib/netdata/conf.d`.
 To copy a stock file and edit it, run `/etc/netdata/edit-config`. Running this command without an argument, will list the available stock files.
@ -116,6 +117,9 @@ plugin | language | plugin<br/>configuration | modules<br/>configuration |
 `fping.plugin`<br/>(external plugin for collecting network latencies)|`C`|`fping.conf`|This plugin is a wrapper for the `fping` command.
 `ioping.plugin`<br/>(external plugin for collecting disk latencies)|`C`|`ioping.conf`|This plugin is a wrapper for the `ioping` command.
 `freeipmi.plugin`<br/>(external plugin for collecting IPMI h/w sensors)|`C`|`netdata.conf` section `[plugin:freeipmi]`
+`nfacct.plugin`<br/>(external plugin for monitoring netfilter firewall and connection tracker)|`C`|`netdata.conf` section `[plugin:nfacct]`|N/A
+`xenstat.plugin`<br/>(external plugin for monitoring XCP-ng and XenServer)|`C`|`netdata.conf` section `[plugin:xenstat]`|N/A
+`perf.plugin`<br/>(external plugin for monitoring CPU performance on Linux)|`C`|`netdata.conf` section `[plugin:perf]`|N/A
 `idlejitter.plugin`<br/>(internal plugin for monitoring CPU jitter)|`C`|N/A|N/A
 `macos.plugin`<br/>(internal plugin for monitoring MacOS system resources)|`C`|`netdata.conf` section `[plugin:macos]`|one section for each module `[plugin:macos:MODULE]`. Each module may provide additional sections in the form of `[plugin:macos:MODULE:SUBSECTION]`.
 `node.d.plugin`<br/>(external plugin orchestrator of node.js modules)|`node.js`|`node.d.conf`|a file for each module in `/etc/netdata/node.d/`.
@ -321,6 +325,7 @@ application|language|notes|
 :---------:|:------:|:----|
 apps|C|`apps.plugin` collects resource usage statistics for all processes running in the system. It groups the entire process tree and reports dozens of metrics for CPU utilization, memory footprint, disk I/O, swap memory, network connections, open files and sockets, etc. It reports metrics for application groups, users and user groups.<br/>&nbsp;<br/>[Documentation of `apps.plugin`](../collectors/apps.plugin/).<br/>&nbsp;<br/>Netdata plugin: [`apps_plugin.c`](../collectors/apps.plugin)<br/>configuration file: [`apps_groups.conf`](../collectors/apps.plugin)|
 ioping|C|Charts disk latency statistics for a directory/file/device, using the `ioping` command. A recent (probably unreleased) version of ioping is required. The plugin supplied can install it in `/usr/local`.<br/>&nbsp;<br/>Netdata plugin: [ioping.plugin](../collectors/ioping.plugin) (this is a shell wrapper to start ioping - once ioping is started, Netdata and ioping communicate directly - it can also install the right version of ioping)<br/>configuration file: [ioping.conf](../collectors/ioping.plugin)|
+perf|C|`perf.plugin` collects CPU performance metrics using hardware performance monitoring units (PMU).<br/>&nbsp;<br/>[Documentation of `perf.plugin`](../collectors/perf.plugin/).<br/>&nbsp;<br/>Netdata plugin: [`perf_plugin.c`](../collectors/perf.plugin)|
 cpu_apps|BASH<br/>Shell Script|Collects the CPU utilization of select apps.<br/><br/>DEPRECATED IN FAVOR OF `apps.plugin`. It is still supplied only as an example module to shell scripting plugins.<br/>&nbsp;<br/>Netdata plugin: [charts.d.plugin](../collectors/charts.d.plugin#chartsdplugin)<br/>plugin module: [cpu_apps.chart.sh](../collectors/charts.d.plugin/cpu_apps)<br/>configuration file: [charts.d/cpu_apps.conf](../collectors/charts.d.plugin/cpu_apps)|
 load_average|BASH<br/>Shell Script|Collects the current system load average.<br/><br/>DEPRECATED IN FAVOR OF THE NETDATA INTERNAL ONE. It is still supplied only as an example module to shell scripting plugins.<br/>&nbsp;<br/>Netdata plugin: [charts.d.plugin](../collectors/charts.d.plugin#chartsdplugin)<br/>plugin module: [load_average.chart.sh](../collectors/charts.d.plugin/load_average)<br/>configuration file: [charts.d/load_average.conf](../collectors/charts.d.plugin/load_average)|
 mem_apps|BASH<br/>Shell Script|Collects the memory footprint of select applications.<br/><br/>DEPRECATED IN FAVOR OF `apps.plugin`. It is still supplied only as an example module to shell scripting plugins.<br/>&nbsp;<br/>Netdata plugin: [charts.d.plugin](../collectors/charts.d.plugin#chartsdplugin)<br/>plugin module: [mem_apps.chart.sh](../collectors/charts.d.plugin/mem_apps)<br/>configuration file: [charts.d/mem_apps.conf](../collectors/charts.d.plugin/mem_apps)|
--- a/docs/generator/buildyaml.sh
+++ b/docs/generator/buildyaml.sh
@ -229,6 +229,7 @@ navpart 3 collectors/ioping.plugin
 navpart 3 collectors/freeipmi.plugin
 navpart 3 collectors/nfacct.plugin
 navpart 3 collectors/xenstat.plugin
+navpart 3 collectors/perf.plugin


 echo -ne "    - 'docs/Third-Party-Plugins.md'
--- a/netdata-installer.sh
+++ b/netdata-installer.sh
@ -55,7 +55,7 @@ download_go() {
 	else
 		echo >&2
 		echo >&2 "Downloading go.d plugin from '${url}' failed because of missing mandatory packages."
-	        echo >&2 "Either add packages or disable it by issuing '--disable-go' in the installer"
+		echo >&2 "Either add packages or disable it by issuing '--disable-go' in the installer"
 		echo >&2

 		run_failed "I need curl or wget to proceed, but neither is available on this system."
@ -213,10 +213,10 @@ while [ -n "${1}" ]; do
 		"--disable-plugin-nfacct") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-plugin-nfacct/} --disable-plugin-nfacct";;
 		"--enable-plugin-xenstat") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-plugin-xenstat/} --enable-plugin-xenstat";;
 		"--disable-plugin-xenstat") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-plugin-xenstat/} --disable-plugin-xenstat";;
-        "--enable-backend-kinesis") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-backend-kinesis/} --enable-backend-kinesis";;
-        "--disable-backend-kinesis") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-backend-kinesis/} --disable-backend-kinesis";;
-        "--enable-backend-prometheus-remote-write") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-backend-prometheus-remote-write/} --enable-backend-prometheus-remote-write";;
-        "--disable-backend-prometheus-remote-write") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-backend-prometheus-remote-write/} --disable-backend-prometheus-remote-write";;
+		"--enable-backend-kinesis") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-backend-kinesis/} --enable-backend-kinesis";;
+		"--disable-backend-kinesis") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-backend-kinesis/} --disable-backend-kinesis";;
+		"--enable-backend-prometheus-remote-write") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-backend-prometheus-remote-write/} --enable-backend-prometheus-remote-write";;
+		"--disable-backend-prometheus-remote-write") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-backend-prometheus-remote-write/} --disable-backend-prometheus-remote-write";;
 		"--enable-lto") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--enable-lto/} --enable-lto";;
 		"--disable-lto") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-lto/} --disable-lto";;
 		"--disable-x86-sse") NETDATA_CONFIGURE_OPTIONS="${NETDATA_CONFIGURE_OPTIONS//--disable-x86-sse/} --disable-x86-sse";;
@ -736,15 +736,20 @@ if [ "${UID}" -eq 0 ]; then
 		run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/nfacct.plugin"
 	fi

-    if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin" ]; then
-        run chown root:${NETDATA_GROUP} "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin"
-        run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin"
-    fi
+	if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin" ]; then
+		run chown root:${NETDATA_GROUP} "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin"
+		run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/xenstat.plugin"
+	fi

-    if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping" ]; then
-        run chown root:${NETDATA_GROUP} "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping"
-        run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping"
-    fi
+	if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/perf.plugin" ]; then
+		run chown root:${NETDATA_GROUP} "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/perf.plugin"
+		run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/perf.plugin"
+	fi
+
+	if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping" ]; then
+		run chown root:${NETDATA_GROUP} "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping"
+		run chmod 4750 "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/ioping"
+	fi

 	if [ -f "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/cgroup-network" ]; then
 		run chown "root:${NETDATA_GROUP}" "${NETDATA_PREFIX}/usr/libexec/netdata/plugins.d/cgroup-network"
@ -876,7 +881,7 @@ else
 	create_netdata_conf "${NETDATA_PREFIX}/etc/netdata/netdata.conf" "http://localhost:${NETDATA_PORT}/netdata.conf"
 fi
 if [ "${UID}" -eq 0 ]; then
-        run chown "${NETDATA_USER}" "${NETDATA_PREFIX}/etc/netdata/netdata.conf"
+	run chown "${NETDATA_USER}" "${NETDATA_PREFIX}/etc/netdata/netdata.conf"
 fi
 run chmod 0664 "${NETDATA_PREFIX}/etc/netdata/netdata.conf"

--- a/web/gui/dashboard_info.js
+++ b/web/gui/dashboard_info.js
@ -473,6 +473,12 @@ netdataDashboard.menu = {
        title: 'wmi',
        icon: '<i class="fas fa-server"></i>',
        info: undefined
+    },
+
+    'perf': {
+        title: 'Perf Counters',
+        icon: '<i class="fas fa-tachometer-alt"></i>',
+        info: 'Performance Monitoring Counters (PMC). Data collected using <b>perf_event_open()</b> system call which utilises Hardware Performance Monitoring Units (PMU).'
    }
 };