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core: support percentage specifications on TasksMax=

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This adds support for a TasksMax=40% syntax for specifying values relative to
the system's configured maximum number of processes. This is useful in order to
neatly subdivide the available room for tasks within containers.
This commit is contained in:
Lennart Poettering
2016-07-22 15:33:12 +02:00
parent bf3dd08a81
commit 83f8e80857
7 changed files with 156 additions and 27 deletions
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src/test/test-util.c
+38
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@@ -308,7 +308,43 @@ static void test_physical_memory_scale(void) {
/* overflow */
assert_se(physical_memory_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
}
static void test_system_tasks_max(void) {
uint64_t t;
t = system_tasks_max();
assert_se(t > 0);
assert_se(t < UINT64_MAX);
log_info("Max tasks: %" PRIu64, t);
}
static void test_system_tasks_max_scale(void) {
uint64_t t;
t = system_tasks_max();
assert_se(system_tasks_max_scale(0, 100) == 0);
assert_se(system_tasks_max_scale(100, 100) == t);
assert_se(system_tasks_max_scale(0, 1) == 0);
assert_se(system_tasks_max_scale(1, 1) == t);
assert_se(system_tasks_max_scale(2, 1) == 2*t);
assert_se(system_tasks_max_scale(0, 2) == 0);
assert_se(system_tasks_max_scale(1, 2) == t/2);
assert_se(system_tasks_max_scale(2, 2) == t);
assert_se(system_tasks_max_scale(3, 2) == (3*t)/2);
assert_se(system_tasks_max_scale(4, 2) == t*2);
assert_se(system_tasks_max_scale(0, UINT32_MAX) == 0);
assert_se(system_tasks_max_scale((UINT32_MAX-1)/2, UINT32_MAX-1) == t/2);
assert_se(system_tasks_max_scale(UINT32_MAX, UINT32_MAX) == t);
/* overflow */
assert_se(system_tasks_max_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
}
int main(int argc, char *argv[]) {
@@ -327,6 +363,8 @@ int main(int argc, char *argv[]) {
test_raw_clone();
test_physical_memory();
test_physical_memory_scale();
test_system_tasks_max();
test_system_tasks_max_scale();
return 0;
}