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Merge pull request #10507 from cdown/cpu_acct
cgroup v2: Don't require CPU controller for CPU accounting in 4.15+
This commit is contained in:
commit
2b38a8ea80
@ -307,8 +307,9 @@
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<varname>TasksAccounting=</varname>, <varname>IOAccounting=</varname> and <varname>IPAccounting=</varname>. See
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<varname>TasksAccounting=</varname>, <varname>IOAccounting=</varname> and <varname>IPAccounting=</varname>. See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details on the per-unit settings. <varname>DefaultTasksAccounting=</varname> defaults to yes,
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for details on the per-unit settings. <varname>DefaultTasksAccounting=</varname> defaults to yes,
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<varname>DefaultMemoryAccounting=</varname> to &MEMORY_ACCOUNTING_DEFAULT;, the other four settings to
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<varname>DefaultMemoryAccounting=</varname> to &MEMORY_ACCOUNTING_DEFAULT;. <varname>DefaultCPUAccounting=</varname>
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no.</para></listitem>
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defaults to yes if enabling CPU accounting doesn't require the CPU controller to be enabled (Linux 4.15+ using the
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unified hierarchy for resource control), otherwise it defaults to no. The other three settings default to no.</para></listitem>
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</varlistentry>
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</varlistentry>
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<varlistentry>
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<varlistentry>
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@ -12,6 +12,7 @@
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <sys/statfs.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <sys/xattr.h>
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#include <sys/xattr.h>
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#include <unistd.h>
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#include <unistd.h>
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@ -2822,3 +2823,54 @@ static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
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};
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};
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DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
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DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);
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CGroupMask get_cpu_accounting_mask(void) {
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static CGroupMask needed_mask = (CGroupMask) -1;
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/* On kernel ≥4.15 with unified hierarchy, cpu.stat's usage_usec is
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* provided externally from the CPU controller, which means we don't
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* need to enable the CPU controller just to get metrics. This is good,
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* because enabling the CPU controller comes at a minor performance
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* hit, especially when it's propagated deep into large hierarchies.
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* There's also no separate CPU accounting controller available within
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* a unified hierarchy.
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*
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* This combination of factors results in the desired cgroup mask to
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* enable for CPU accounting varying as follows:
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*
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* ╔═════════════════════╤═════════════════════╗
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* ║ Linux ≥4.15 │ Linux <4.15 ║
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* ╔═══════════════╬═════════════════════╪═════════════════════╣
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* ║ Unified ║ nothing │ CGROUP_MASK_CPU ║
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* ╟───────────────╫─────────────────────┼─────────────────────╢
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* ║ Hybrid/Legacy ║ CGROUP_MASK_CPUACCT │ CGROUP_MASK_CPUACCT ║
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* ╚═══════════════╩═════════════════════╧═════════════════════╝
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*
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* We check kernel version here instead of manually checking whether
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* cpu.stat is present for every cgroup, as that check in itself would
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* already be fairly expensive.
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*
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* Kernels where this patch has been backported will therefore have the
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* CPU controller enabled unnecessarily. This is more expensive than
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* necessary, but harmless. ☺️
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*/
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if (needed_mask == (CGroupMask) -1) {
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if (cg_all_unified()) {
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struct utsname u;
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assert_se(uname(&u) >= 0);
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if (str_verscmp(u.release, "4.15") < 0)
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needed_mask = CGROUP_MASK_CPU;
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else
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needed_mask = 0;
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} else
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needed_mask = CGROUP_MASK_CPUACCT;
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}
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return needed_mask;
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}
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bool cpu_accounting_is_cheap(void) {
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return get_cpu_accounting_mask() == 0;
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}
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@ -69,6 +69,9 @@ static inline CGroupMask CGROUP_MASK_EXTEND_JOINED(CGroupMask mask) {
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return mask;
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return mask;
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}
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}
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CGroupMask get_cpu_accounting_mask(void);
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bool cpu_accounting_is_cheap(void);
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/* Special values for all weight knobs on unified hierarchy */
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/* Special values for all weight knobs on unified hierarchy */
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#define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_WEIGHT_MIN UINT64_C(1)
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#define CGROUP_WEIGHT_MIN UINT64_C(1)
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@ -231,7 +231,7 @@ static int process(
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if (g->n_tasks > 0)
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if (g->n_tasks > 0)
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g->n_tasks_valid = true;
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g->n_tasks_valid = true;
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} else if (STR_IN_SET(controller, "cpu", "cpuacct")) {
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} else if (STR_IN_SET(controller, "cpu", "cpuacct") || cpu_accounting_is_cheap()) {
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_cleanup_free_ char *p = NULL, *v = NULL;
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_cleanup_free_ char *p = NULL, *v = NULL;
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uint64_t new_usage;
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uint64_t new_usage;
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nsec_t timestamp;
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nsec_t timestamp;
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@ -1178,7 +1178,7 @@ CGroupMask cgroup_context_get_mask(CGroupContext *c) {
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/* Figure out which controllers we need, based on the cgroup context object */
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/* Figure out which controllers we need, based on the cgroup context object */
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if (c->cpu_accounting)
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if (c->cpu_accounting)
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mask |= CGROUP_MASK_CPUACCT;
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mask |= get_cpu_accounting_mask();
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if (cgroup_context_has_cpu_weight(c) ||
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if (cgroup_context_has_cpu_weight(c) ||
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cgroup_context_has_cpu_shares(c) ||
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cgroup_context_has_cpu_shares(c) ||
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@ -2617,13 +2617,15 @@ static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
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r = cg_all_unified();
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r = cg_all_unified();
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if (r < 0)
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if (r < 0)
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return r;
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return r;
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/* Requisite controllers for CPU accounting are not enabled */
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if ((get_cpu_accounting_mask() & ~u->cgroup_realized_mask) != 0)
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return -ENODATA;
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if (r > 0) {
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if (r > 0) {
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_cleanup_free_ char *val = NULL;
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_cleanup_free_ char *val = NULL;
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uint64_t us;
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uint64_t us;
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if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0)
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return -ENODATA;
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r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", STRV_MAKE("usage_usec"), &val);
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r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", STRV_MAKE("usage_usec"), &val);
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if (r < 0)
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if (r < 0)
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return r;
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return r;
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@ -2636,9 +2638,6 @@ static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
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ns = us * NSEC_PER_USEC;
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ns = us * NSEC_PER_USEC;
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} else {
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} else {
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if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
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return -ENODATA;
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r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
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r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
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if (r == -ENOENT)
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if (r == -ENOENT)
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return -ENODATA;
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return -ENODATA;
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@ -603,7 +603,7 @@ int bus_cgroup_set_property(
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flags |= UNIT_PRIVATE;
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flags |= UNIT_PRIVATE;
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if (streq(name, "CPUAccounting"))
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if (streq(name, "CPUAccounting"))
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return bus_cgroup_set_boolean(u, name, &c->cpu_accounting, CGROUP_MASK_CPUACCT|CGROUP_MASK_CPU, message, flags, error);
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return bus_cgroup_set_boolean(u, name, &c->cpu_accounting, get_cpu_accounting_mask(), message, flags, error);
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if (streq(name, "CPUWeight"))
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if (streq(name, "CPUWeight"))
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return bus_cgroup_set_cpu_weight(u, name, &c->cpu_weight, message, flags, error);
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return bus_cgroup_set_cpu_weight(u, name, &c->cpu_weight, message, flags, error);
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@ -28,6 +28,7 @@
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#include "bus-error.h"
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#include "bus-error.h"
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#include "bus-util.h"
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#include "bus-util.h"
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#include "capability-util.h"
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#include "capability-util.h"
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#include "cgroup-util.h"
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#include "clock-util.h"
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#include "clock-util.h"
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#include "conf-parser.h"
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#include "conf-parser.h"
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#include "cpu-set-util.h"
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#include "cpu-set-util.h"
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@ -119,7 +120,7 @@ static nsec_t arg_timer_slack_nsec = NSEC_INFINITY;
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static usec_t arg_default_timer_accuracy_usec = 1 * USEC_PER_MINUTE;
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static usec_t arg_default_timer_accuracy_usec = 1 * USEC_PER_MINUTE;
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static Set* arg_syscall_archs = NULL;
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static Set* arg_syscall_archs = NULL;
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static FILE* arg_serialization = NULL;
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static FILE* arg_serialization = NULL;
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static bool arg_default_cpu_accounting = false;
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static int arg_default_cpu_accounting = -1;
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static bool arg_default_io_accounting = false;
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static bool arg_default_io_accounting = false;
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static bool arg_default_ip_accounting = false;
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static bool arg_default_ip_accounting = false;
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static bool arg_default_blockio_accounting = false;
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static bool arg_default_blockio_accounting = false;
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@ -702,7 +703,7 @@ static int parse_config_file(void) {
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{ "Manager", "DefaultLimitNICE", config_parse_rlimit, RLIMIT_NICE, arg_default_rlimit },
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{ "Manager", "DefaultLimitNICE", config_parse_rlimit, RLIMIT_NICE, arg_default_rlimit },
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{ "Manager", "DefaultLimitRTPRIO", config_parse_rlimit, RLIMIT_RTPRIO, arg_default_rlimit },
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{ "Manager", "DefaultLimitRTPRIO", config_parse_rlimit, RLIMIT_RTPRIO, arg_default_rlimit },
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{ "Manager", "DefaultLimitRTTIME", config_parse_rlimit, RLIMIT_RTTIME, arg_default_rlimit },
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{ "Manager", "DefaultLimitRTTIME", config_parse_rlimit, RLIMIT_RTTIME, arg_default_rlimit },
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{ "Manager", "DefaultCPUAccounting", config_parse_bool, 0, &arg_default_cpu_accounting },
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{ "Manager", "DefaultCPUAccounting", config_parse_tristate, 0, &arg_default_cpu_accounting },
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{ "Manager", "DefaultIOAccounting", config_parse_bool, 0, &arg_default_io_accounting },
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{ "Manager", "DefaultIOAccounting", config_parse_bool, 0, &arg_default_io_accounting },
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{ "Manager", "DefaultIPAccounting", config_parse_bool, 0, &arg_default_ip_accounting },
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{ "Manager", "DefaultIPAccounting", config_parse_bool, 0, &arg_default_ip_accounting },
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{ "Manager", "DefaultBlockIOAccounting", config_parse_bool, 0, &arg_default_blockio_accounting },
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{ "Manager", "DefaultBlockIOAccounting", config_parse_bool, 0, &arg_default_blockio_accounting },
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@ -751,7 +752,14 @@ static void set_manager_defaults(Manager *m) {
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m->default_restart_usec = arg_default_restart_usec;
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m->default_restart_usec = arg_default_restart_usec;
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m->default_start_limit_interval = arg_default_start_limit_interval;
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m->default_start_limit_interval = arg_default_start_limit_interval;
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m->default_start_limit_burst = arg_default_start_limit_burst;
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m->default_start_limit_burst = arg_default_start_limit_burst;
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m->default_cpu_accounting = arg_default_cpu_accounting;
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/* On 4.15+ with unified hierarchy, CPU accounting is essentially free as it doesn't require the CPU
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* controller to be enabled, so the default is to enable it unless we got told otherwise. */
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if (arg_default_cpu_accounting >= 0)
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m->default_cpu_accounting = arg_default_cpu_accounting;
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else
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m->default_cpu_accounting = cpu_accounting_is_cheap();
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m->default_io_accounting = arg_default_io_accounting;
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m->default_io_accounting = arg_default_io_accounting;
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m->default_ip_accounting = arg_default_ip_accounting;
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m->default_ip_accounting = arg_default_ip_accounting;
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m->default_blockio_accounting = arg_default_blockio_accounting;
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m->default_blockio_accounting = arg_default_blockio_accounting;
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@ -2,6 +2,8 @@
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#include <stdio.h>
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#include <stdio.h>
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#include "cgroup.h"
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#include "cgroup-util.h"
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#include "macro.h"
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#include "macro.h"
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#include "manager.h"
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#include "manager.h"
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#include "rm-rf.h"
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#include "rm-rf.h"
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@ -10,11 +12,27 @@
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#include "tests.h"
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#include "tests.h"
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#include "unit.h"
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#include "unit.h"
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#define ASSERT_CGROUP_MASK(got, expected) \
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log_cgroup_mask(got, expected); \
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assert_se(got == expected)
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#define ASSERT_CGROUP_MASK_JOINED(got, expected) ASSERT_CGROUP_MASK(got, CGROUP_MASK_EXTEND_JOINED(expected))
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static void log_cgroup_mask(CGroupMask got, CGroupMask expected) {
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_cleanup_free_ char *e_store = NULL, *g_store = NULL;
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assert_se(cg_mask_to_string(expected, &e_store) >= 0);
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log_info("Expected mask: %s\n", e_store);
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assert_se(cg_mask_to_string(got, &g_store) >= 0);
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log_info("Got mask: %s\n", g_store);
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}
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static int test_cgroup_mask(void) {
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static int test_cgroup_mask(void) {
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_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
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_cleanup_(rm_rf_physical_and_freep) char *runtime_dir = NULL;
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_cleanup_(manager_freep) Manager *m = NULL;
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_cleanup_(manager_freep) Manager *m = NULL;
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Unit *son, *daughter, *parent, *root, *grandchild, *parent_deep;
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Unit *son, *daughter, *parent, *root, *grandchild, *parent_deep;
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int r;
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int r;
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CGroupMask cpu_accounting_mask = get_cpu_accounting_mask();
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r = enter_cgroup_subroot();
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r = enter_cgroup_subroot();
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if (r == -ENOMEDIUM)
|
if (r == -ENOMEDIUM)
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@ -57,36 +75,36 @@ static int test_cgroup_mask(void) {
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root = UNIT_DEREF(parent->slice);
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root = UNIT_DEREF(parent->slice);
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|
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/* Verify per-unit cgroups settings. */
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/* Verify per-unit cgroups settings. */
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assert_se(unit_get_own_mask(son) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT));
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(son), CGROUP_MASK_CPU);
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assert_se(unit_get_own_mask(daughter) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(daughter), cpu_accounting_mask);
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assert_se(unit_get_own_mask(grandchild) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(grandchild), 0);
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assert_se(unit_get_own_mask(parent_deep) == CGROUP_MASK_MEMORY);
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(parent_deep), CGROUP_MASK_MEMORY);
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assert_se(unit_get_own_mask(parent) == (CGROUP_MASK_IO | CGROUP_MASK_BLKIO));
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(parent), (CGROUP_MASK_IO | CGROUP_MASK_BLKIO));
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assert_se(unit_get_own_mask(root) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_own_mask(root), 0);
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||||||
|
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||||||
/* Verify aggregation of member masks */
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/* Verify aggregation of member masks */
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assert_se(unit_get_members_mask(son) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(son), 0);
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assert_se(unit_get_members_mask(daughter) == 0);
|
ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(daughter), 0);
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assert_se(unit_get_members_mask(grandchild) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(grandchild), 0);
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assert_se(unit_get_members_mask(parent_deep) == 0);
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ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(parent_deep), 0);
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assert_se(unit_get_members_mask(parent) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
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ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(parent), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY));
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||||||
assert_se(unit_get_members_mask(root) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_members_mask(root), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
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||||||
|
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||||||
/* Verify aggregation of sibling masks. */
|
/* Verify aggregation of sibling masks. */
|
||||||
assert_se(unit_get_siblings_mask(son) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(son), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY));
|
||||||
assert_se(unit_get_siblings_mask(daughter) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(daughter), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY));
|
||||||
assert_se(unit_get_siblings_mask(grandchild) == 0);
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(grandchild), 0);
|
||||||
assert_se(unit_get_siblings_mask(parent_deep) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(parent_deep), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY));
|
||||||
assert_se(unit_get_siblings_mask(parent) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(parent), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
|
||||||
assert_se(unit_get_siblings_mask(root) == (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
|
ASSERT_CGROUP_MASK_JOINED(unit_get_siblings_mask(root), (CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY));
|
||||||
|
|
||||||
/* Verify aggregation of target masks. */
|
/* Verify aggregation of target masks. */
|
||||||
assert_se(unit_get_target_mask(son) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
ASSERT_CGROUP_MASK(unit_get_target_mask(son), (CGROUP_MASK_EXTEND_JOINED(CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
||||||
assert_se(unit_get_target_mask(daughter) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
ASSERT_CGROUP_MASK(unit_get_target_mask(daughter), (CGROUP_MASK_EXTEND_JOINED(CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
||||||
assert_se(unit_get_target_mask(grandchild) == 0);
|
ASSERT_CGROUP_MASK(unit_get_target_mask(grandchild), 0);
|
||||||
assert_se(unit_get_target_mask(parent_deep) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
ASSERT_CGROUP_MASK(unit_get_target_mask(parent_deep), (CGROUP_MASK_EXTEND_JOINED(CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
||||||
assert_se(unit_get_target_mask(parent) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
ASSERT_CGROUP_MASK(unit_get_target_mask(parent), (CGROUP_MASK_EXTEND_JOINED(CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
||||||
assert_se(unit_get_target_mask(root) == ((CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
ASSERT_CGROUP_MASK(unit_get_target_mask(root), (CGROUP_MASK_EXTEND_JOINED(CGROUP_MASK_CPU | cpu_accounting_mask | CGROUP_MASK_IO | CGROUP_MASK_BLKIO | CGROUP_MASK_MEMORY) & m->cgroup_supported));
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
@ -5,3 +5,4 @@ Description=Daughter Service
|
|||||||
Slice=parent.slice
|
Slice=parent.slice
|
||||||
Type=oneshot
|
Type=oneshot
|
||||||
ExecStart=/bin/true
|
ExecStart=/bin/true
|
||||||
|
CPUAccounting=true
|
||||||
|
Loading…
Reference in New Issue
Block a user