util: when determining the amount of memory on this system, take cgroup limit into account

When determining the amount of RAM in the system, let's make sure we also read
the root-level cgroup memory limit into account. This isn't particularly useful
on the host, but in containers it makes sure that whatever memory the container
got assigned is actually used for RAM size calculations.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/test/test-util.c b/src/test/test-util.c
index 9b6d2a7968..5b3fbcff53 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -26,6 +26,7 @@
 #include "def.h"
 #include "fileio.h"
 #include "fs-util.h"
+#include "parse-util.h"
 #include "raw-clone.h"
 #include "rm-rf.h"
 #include "string-util.h"
@@ -263,6 +264,18 @@ static void test_raw_clone(void) {
         }
 }
 
+static void test_physical_memory(void) {
+        uint64_t p;
+        char buf[FORMAT_BYTES_MAX];
+
+        p = physical_memory();
+        assert_se(p > 0);
+        assert_se(p < UINT64_MAX);
+        assert_se(p % page_size() == 0);
+
+        log_info("Memory: %s", format_bytes(buf, sizeof(buf), p));
+}
+
 int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
@@ -277,6 +290,7 @@ int main(int argc, char *argv[]) {
         test_log2i();
         test_execute_directory();
         test_raw_clone();
+        test_physical_memory();
 
         return 0;
 }