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Merge pull request #11206 from cdown/cgroup_no_v1

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cgroup: Imply systemd.unified_cgroup_hierarchy=1 on cgroup_no_v1=all
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Zbigniew Jędrzejewski-Szmek 2018-12-21 19:48:51 +01:00 committed by GitHub
commit 9d6e839ed8
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3 changed files with 27 additions and 3 deletions
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4
NEWS
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@ -127,6 +127,10 @@ CHANGES WITH 240 in spe:
* Support for disabling a particular cgroup controller within a sub-tree
has been added through the DisableControllers= directive.
* cgroup_no_v1=all on the kernel command line now also implies
using the unified cgroup hierarchy, unless one explicitly passes
systemd.unified_cgroup_hierarchy=0 on the kernel command line.
* The new "MemoryMin=" unit file property may now be used to set the
memory usage protection limit of processes invoked by the unit. This
controls the cgroupsv2 memory.min attribute. Similarly, the new

15
src/basic/cgroup-util.c
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@ -2706,6 +2706,7 @@ bool cg_is_unified_wanted(void) {
int r;
bool b;
const bool is_default = DEFAULT_HIERARCHY == CGROUP_UNIFIED_ALL;
_cleanup_free_ char *c = NULL;
/* If we have a cached value, return that. */
if (wanted >= 0)
@ -2716,11 +2717,19 @@ bool cg_is_unified_wanted(void) {
if (cg_unified_flush() >= 0)
return (wanted = unified_cache >= CGROUP_UNIFIED_ALL);
/* Otherwise, let's see what the kernel command line has to say.
* Since checking is expensive, cache a non-error result. */
/* If we were explicitly passed systemd.unified_cgroup_hierarchy,
* respect that. */
r = proc_cmdline_get_bool("systemd.unified_cgroup_hierarchy", &b);
if (r > 0)
return (wanted = b);
return (wanted = r > 0 ? b : is_default);
/* If we passed cgroup_no_v1=all with no other instructions, it seems
* highly unlikely that we want to use hybrid or legacy hierarchy. */
r = proc_cmdline_get_key("cgroup_no_v1", 0, &c);
if (r > 0 && streq_ptr(c, "all"))
return (wanted = true);
return (wanted = is_default);
}
bool cg_is_legacy_wanted(void) {

11
src/test/test-cgroup-util.c
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@ -369,6 +369,17 @@ static void test_is_wanted(void) {
"systemd.unified_cgroup_hierarchy=0 "
"systemd.legacy_systemd_cgroup_controller=0", 1) >= 0);
test_is_wanted_print(false);
/* cgroup_no_v1=all implies unified cgroup hierarchy, unless otherwise
* explicitly specified. */
assert_se(setenv("SYSTEMD_PROC_CMDLINE",
"cgroup_no_v1=all", 1) >= 0);
test_is_wanted_print(false);
assert_se(setenv("SYSTEMD_PROC_CMDLINE",
"cgroup_no_v1=all "
"systemd.unified_cgroup_hierarchy=0", 1) >= 0);
test_is_wanted_print(false);
}
static void test_cg_tests(void) {