[COMMIT osv master] modules: add simple sysinfo utility

[Commit Bot]

From: Waldemar Kozaczuk <jwkoz...@gmail.com>
Committer: Waldemar Kozaczuk <jwkoz...@gmail.com>
Branch: master

modules: add simple sysinfo utility

This adds simple tiny sysinfo utility which once added
to an image will periodically report system memory utilization
every 1 second by default which can be changed by parameter.

Eventually sysinfo can be enhanced to report CPU utilization as
well.

Signed-off-by: Waldemar Kozaczuk <jwkoz...@gmail.com>

---
diff --git a/modules/sysinfo/.gitignore b/modules/sysinfo/.gitignore
--- a/modules/sysinfo/.gitignore
+++ b/modules/sysinfo/.gitignore
@@ -0,0 +1 @@
+sysinfo*.so
diff --git a/modules/sysinfo/Makefile b/modules/sysinfo/Makefile
--- a/modules/sysinfo/Makefile
+++ b/modules/sysinfo/Makefile
@@ -0,0 +1,14 @@
+INCLUDES = -I../../include
+COMMON_FLAGS = -g -Wall -fPIC $(INCLUDES) -O2
+CXXFLAGS = -std=c++11 $(COMMON_FLAGS)
+
+.PHONY: module
+module: sysinfo.so
+
+quiet = $(if $V, $1, @echo " $2"; $1)
+
+sysinfo.so: sysinfo.cc
+ $(call quiet, $(CXX) $(CXXFLAGS) -shared -o $@ sysinfo.cc, LINK $@)
+
+clean:
+ rm -f sysinfo.so sysinfo.d
diff --git a/modules/sysinfo/module.py b/modules/sysinfo/module.py
--- a/modules/sysinfo/module.py
+++ b/modules/sysinfo/module.py
@@ -0,0 +1,4 @@
+from osv.modules import api
+
+daemon = api.run_on_init('/sysinfo.so --interval 1000000 &!')
+default = daemon
diff --git a/modules/sysinfo/sysinfo.cc b/modules/sysinfo/sysinfo.cc
--- a/modules/sysinfo/sysinfo.cc
+++ b/modules/sysinfo/sysinfo.cc
@@ -0,0 +1,36 @@
+#include <iostream>
+#include <sys/sysinfo.h>
+#include <unistd.h>
+#include <functional>
+#include <osv/options.hh>
+
+static void usage()
+{
+ std::cout << "Allowed options:\n";
+ std::cout << " --interval arg (=1000000) repeat every N microseconds\n";
+}
+
+static void handle_parse_error(const std::string &message)
+{
+ std::cout << message << std::endl;
+ usage();
+ exit(1);
+}
+
+int main(int ac, char** av)
+{
+ int interval_in_usecs = 1000000;
+
+ auto options_values = options::parse_options_values(ac - 1, av + 1, handle_parse_error);
+ if (options::option_value_exists(options_values, "interval")) {
+ interval_in_usecs = options::extract_option_int_value(options_values, "interval", handle_parse_error);
+ }
+
+ while (1) {
+ struct sysinfo info;
+ sysinfo(&info);
+ std::cout << "--> memory, total: " << info.totalram / 0x100000 << " MiB, used: " <<
+ (info.totalram - info.freeram) / 0x100000 << " MiB" << std::endl;
+ usleep(interval_in_usecs);
+ }
+}
diff --git a/modules/sysinfo/usr.manifest b/modules/sysinfo/usr.manifest
--- a/modules/sysinfo/usr.manifest
+++ b/modules/sysinfo/usr.manifest
@@ -0,0 +1 @@
+/sysinfo.so: ${MODULE_DIR}/sysinfo.so