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authorLennart Poettering <lennart@poettering.net>2016-06-08 20:45:32 +0200
committerLennart Poettering <lennart@poettering.net>2016-06-14 20:01:45 +0200
commitd8cf2ac79b524d7784bccb428295ebc9c5e8548c (patch)
tree43a03ab780ccc0b130dc57322c816f99e3f09754 /src/test
parent799ec13412e2f6649fd69ce4f1ca1674a40039b0 (diff)
util: introduce physical_memory_scale() to unify how we scale by physical memory
The various bits of code did the scaling all different, let's unify this, given that the code is not trivial.
Diffstat (limited to 'src/test')
-rw-r--r--src/test/test-util.c38
1 files changed, 37 insertions, 1 deletions
diff --git a/src/test/test-util.c b/src/test/test-util.c
index 5b3fbcff53..e177612a9f 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -273,7 +273,42 @@ static void test_physical_memory(void) {
assert_se(p < UINT64_MAX);
assert_se(p % page_size() == 0);
- log_info("Memory: %s", format_bytes(buf, sizeof(buf), p));
+ log_info("Memory: %s (%" PRIu64 ")", format_bytes(buf, sizeof(buf), p), p);
+}
+
+static void test_physical_memory_scale(void) {
+ uint64_t p;
+
+ p = physical_memory();
+
+ assert_se(physical_memory_scale(0, 100) == 0);
+ assert_se(physical_memory_scale(100, 100) == p);
+
+ log_info("Memory original: %" PRIu64, physical_memory());
+ log_info("Memory scaled by 50%%: %" PRIu64, physical_memory_scale(50, 100));
+ log_info("Memory divided by 2: %" PRIu64, physical_memory() / 2);
+ log_info("Page size: %zu", page_size());
+
+ /* There might be an uneven number of pages, hence permit these calculations to be half a page off... */
+ assert_se(page_size()/2 + physical_memory_scale(50, 100) - p/2 <= page_size());
+ assert_se(physical_memory_scale(200, 100) == p*2);
+
+ assert_se(physical_memory_scale(0, 1) == 0);
+ assert_se(physical_memory_scale(1, 1) == p);
+ assert_se(physical_memory_scale(2, 1) == p*2);
+
+ assert_se(physical_memory_scale(0, 2) == 0);
+
+ assert_se(page_size()/2 + physical_memory_scale(1, 2) - p/2 <= page_size());
+ assert_se(physical_memory_scale(2, 2) == p);
+ assert_se(physical_memory_scale(4, 2) == p*2);
+
+ assert_se(physical_memory_scale(0, UINT32_MAX) == 0);
+ assert_se(physical_memory_scale(UINT32_MAX, UINT32_MAX) == p);
+
+ /* overflow */
+ assert_se(physical_memory_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
+
}
int main(int argc, char *argv[]) {
@@ -291,6 +326,7 @@ int main(int argc, char *argv[]) {
test_execute_directory();
test_raw_clone();
test_physical_memory();
+ test_physical_memory_scale();
return 0;
}