</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>ConditionMemoryPressure=</varname></term>
+ <term><varname>ConditionCPUPressure=</varname></term>
+ <term><varname>ConditionIOPressure=</varname></term>
+
+ <listitem><para>Verify that the overall system (memory, CPU or IO) pressure is below or equal to a threshold.
+ This setting takes a threshold value as argument. It can be specified as a simple percentage value,
+ suffixed with <literal>%</literal>, in which case the pressure will be measured as an average over the last
+ five minutes before the attempt to start the unit is performed.
+ Alternatively, the average timespan can also be specified using <literal>/</literal> as a separator, for
+ example: <literal>10%/1min</literal>. The supported timespans match what the kernel provides, and are
+ limited to <literal>10sec</literal>, <literal>1min</literal> and <literal>5min</literal>. The
+ <literal>full</literal> PSI will be checked first, and if not found <literal>some</literal> will be
+ checked. For more details, see the documentation on <ulink
+ url="https://www.kernel.org/doc/html/latest/accounting/psi.html">PSI (Pressure Stall Information)
+ </ulink>.</para>
+
+ <para>Optionally, the threshold value can be prefixed with the slice unit under which the pressure will be checked,
+ followed by a <literal>:</literal>. If the slice unit is not specified, the overall system pressure will be measured,
+ instead of a particular cgroup's.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>AssertArchitecture=</varname></term>
<term><varname>AssertVirtualization=</varname></term>
<term><varname>AssertMemory=</varname></term>
<term><varname>AssertCPUs=</varname></term>
<term><varname>AssertOSRelease=</varname></term>
+ <term><varname>AssertMemoryPressure=</varname></term>
+ <term><varname>AssertCPUPressure=</varname></term>
+ <term><varname>AssertIOPressure=</varname></term>
<listitem><para>Similar to the <varname>ConditionArchitecture=</varname>,
<varname>ConditionVirtualization=</varname>, …, condition settings described above, these settings
Unit.ConditionGroup, config_parse_unit_condition_string, CONDITION_GROUP, offsetof(Unit, conditions)
Unit.ConditionControlGroupController, config_parse_unit_condition_string, CONDITION_CONTROL_GROUP_CONTROLLER, offsetof(Unit, conditions)
Unit.ConditionOSRelease, config_parse_unit_condition_string, CONDITION_OS_RELEASE, offsetof(Unit, conditions)
+Unit.ConditionMemoryPressure, config_parse_unit_condition_string, CONDITION_MEMORY_PRESSURE, offsetof(Unit, conditions)
+Unit.ConditionCPUPressure, config_parse_unit_condition_string, CONDITION_CPU_PRESSURE, offsetof(Unit, conditions)
+Unit.ConditionIOPressure, config_parse_unit_condition_string, CONDITION_IO_PRESSURE, offsetof(Unit, conditions)
Unit.AssertPathExists, config_parse_unit_condition_path, CONDITION_PATH_EXISTS, offsetof(Unit, asserts)
Unit.AssertPathExistsGlob, config_parse_unit_condition_path, CONDITION_PATH_EXISTS_GLOB, offsetof(Unit, asserts)
Unit.AssertPathIsDirectory, config_parse_unit_condition_path, CONDITION_PATH_IS_DIRECTORY, offsetof(Unit, asserts)
Unit.AssertGroup, config_parse_unit_condition_string, CONDITION_GROUP, offsetof(Unit, asserts)
Unit.AssertControlGroupController, config_parse_unit_condition_string, CONDITION_CONTROL_GROUP_CONTROLLER, offsetof(Unit, asserts)
Unit.AssertOSRelease, config_parse_unit_condition_string, CONDITION_OS_RELEASE, offsetof(Unit, asserts)
+Unit.AssertMemoryPressure, config_parse_unit_condition_string, CONDITION_MEMORY_PRESSURE, offsetof(Unit, asserts)
+Unit.AssertCPUPressure, config_parse_unit_condition_string, CONDITION_CPU_PRESSURE, offsetof(Unit, asserts)
+Unit.AssertIOPressure, config_parse_unit_condition_string, CONDITION_IO_PRESSURE, offsetof(Unit, asserts)
Unit.CollectMode, config_parse_collect_mode, 0, offsetof(Unit, collect_mode)
Service.PIDFile, config_parse_pid_file, 0, offsetof(Service, pid_file)
Service.ExecCondition, config_parse_exec, SERVICE_EXEC_CONDITION, offsetof(Service, exec_command)
#include "os-util.h"
#include "parse-util.h"
#include "path-util.h"
+#include "percent-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
+#include "psi-util.h"
#include "selinux-util.h"
#include "smack-util.h"
#include "stat-util.h"
(st.st_mode & 0111));
}
+static int condition_test_psi(Condition *c, char **env) {
+ _cleanup_free_ char *first = NULL, *second = NULL, *third = NULL, *fourth = NULL, *pressure_path = NULL;
+ const char *p, *value, *pressure_type;
+ loadavg_t *current, limit;
+ ResourcePressure pressure;
+ int r;
+
+ assert(c);
+ assert(c->parameter);
+ assert(IN_SET(c->type, CONDITION_MEMORY_PRESSURE, CONDITION_CPU_PRESSURE, CONDITION_IO_PRESSURE));
+
+ if (!is_pressure_supported()) {
+ log_debug("Pressure Stall Information (PSI) is not supported, skipping.");
+ return 1;
+ }
+
+ pressure_type = c->type == CONDITION_MEMORY_PRESSURE ? "memory" :
+ c->type == CONDITION_CPU_PRESSURE ? "cpu" :
+ "io";
+
+ p = c->parameter;
+ r = extract_many_words(&p, ":", 0, &first, &second, NULL);
+ if (r <= 0)
+ return log_debug_errno(r < 0 ? r : SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+ /* If only one parameter is passed, then we look at the global system pressure rather than a specific cgroup. */
+ if (r == 1) {
+ pressure_path = path_join("/proc/pressure", pressure_type);
+ if (!pressure_path)
+ return log_oom();
+
+ value = first;
+ } else {
+ const char *controller = strjoina(pressure_type, ".pressure");
+ _cleanup_free_ char *slice_path = NULL;
+ CGroupMask mask, required_mask;
+ char *slice;
+
+ required_mask = c->type == CONDITION_MEMORY_PRESSURE ? CGROUP_MASK_MEMORY :
+ c->type == CONDITION_CPU_PRESSURE ? CGROUP_MASK_CPU :
+ CGROUP_MASK_IO;
+
+ slice = strstrip(first);
+ if (!slice)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+
+ r = cg_all_unified();
+ if (r < 0)
+ return log_debug_errno(r, "Failed to determine whether the unified cgroups hierarchy is used: %m");
+ if (r == 0) {
+ log_debug("PSI condition check requires the unified cgroups hierarchy, skipping.");
+ return 1;
+ }
+
+ r = cg_mask_supported(&mask);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to get supported cgroup controllers: %m");
+
+ if (!FLAGS_SET(mask, required_mask)) {
+ log_debug("Cgroup %s controller not available, skipping PSI condition check.", pressure_type);
+ return 1;
+ }
+
+ r = cg_slice_to_path(slice, &slice_path);
+ if (r < 0)
+ return log_debug_errno(r, "Cannot determine slice \"%s\" cgroup path: %m", slice);
+
+ r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, slice_path, controller, &pressure_path);
+ if (r < 0)
+ return log_debug_errno(r, "Error getting cgroup pressure path from %s: %m", slice_path);
+
+ value = second;
+ }
+
+ /* If a value including a specific timespan (in the intervals allowed by the kernel),
+ * parse it, otherwise we assume just a plain percentage that will be checked if it is
+ * smaller or equal to the current pressure average over 5 minutes. */
+ r = extract_many_words(&value, "/", 0, &third, &fourth, NULL);
+ if (r <= 0)
+ return log_debug_errno(r < 0 ? r : SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+ if (r == 1)
+ current = &pressure.avg300;
+ else {
+ const char *timespan;
+
+ timespan = skip_leading_chars(fourth, NULL);
+ if (!timespan)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+
+ if (startswith(timespan, "10sec"))
+ current = &pressure.avg10;
+ else if (startswith(timespan, "1min"))
+ current = &pressure.avg60;
+ else if (startswith(timespan, "5min"))
+ current = &pressure.avg300;
+ else
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+ }
+
+ value = strstrip(third);
+ if (!value)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse condition parameter %s: %m", c->parameter);
+
+ r = parse_permyriad(value);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to parse permyriad: %s", c->parameter);
+
+ r = store_loadavg_fixed_point(r / 100LU, r % 100LU, &limit);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to parse loadavg: %s", c->parameter);
+
+ r = read_resource_pressure(pressure_path, PRESSURE_TYPE_FULL, &pressure);
+ if (r == -ENODATA) /* cpu.pressure 'full' was added recently, fall back to 'some'. */
+ r = read_resource_pressure(pressure_path, PRESSURE_TYPE_SOME, &pressure);
+ if (r == -ENOENT) {
+ /* We already checked that /proc/pressure exists, so this means we were given a cgroup
+ * that doesn't exist or doesn't exist any longer. */
+ log_debug("\"%s\" not found, skipping PSI check.", pressure_path);
+ return 1;
+ }
+ if (r < 0)
+ return log_debug_errno(r, "Error parsing pressure from %s: %m", pressure_path);
+
+ return *current <= limit;
+}
+
int condition_test(Condition *c, char **env) {
static int (*const condition_tests[_CONDITION_TYPE_MAX])(Condition *c, char **env) = {
[CONDITION_ENVIRONMENT] = condition_test_environment,
[CONDITION_CPU_FEATURE] = condition_test_cpufeature,
[CONDITION_OS_RELEASE] = condition_test_osrelease,
+ [CONDITION_MEMORY_PRESSURE] = condition_test_psi,
+ [CONDITION_CPU_PRESSURE] = condition_test_psi,
+ [CONDITION_IO_PRESSURE] = condition_test_psi,
};
int r, b;
[CONDITION_ENVIRONMENT] = "ConditionEnvironment",
[CONDITION_CPU_FEATURE] = "ConditionCPUFeature",
[CONDITION_OS_RELEASE] = "ConditionOSRelease",
+ [CONDITION_MEMORY_PRESSURE] = "ConditionMemoryPressure",
+ [CONDITION_CPU_PRESSURE] = "ConditionCPUPressure",
+ [CONDITION_IO_PRESSURE] = "ConditionIOPressure",
};
DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);
[CONDITION_ENVIRONMENT] = "AssertEnvironment",
[CONDITION_CPU_FEATURE] = "AssertCPUFeature",
[CONDITION_OS_RELEASE] = "AssertOSRelease",
+ [CONDITION_MEMORY_PRESSURE] = "AssertMemoryPressure",
+ [CONDITION_CPU_PRESSURE] = "AssertCPUPressure",
+ [CONDITION_IO_PRESSURE] = "AssertIOPressure",
};
DEFINE_STRING_TABLE_LOOKUP(assert_type, ConditionType);
CONDITION_ENVIRONMENT,
CONDITION_CPU_FEATURE,
CONDITION_OS_RELEASE,
+ CONDITION_MEMORY_PRESSURE,
+ CONDITION_CPU_PRESSURE,
+ CONDITION_IO_PRESSURE,
CONDITION_NEEDS_UPDATE,
CONDITION_FIRST_BOOT,
#include "nulstr-util.h"
#include "os-util.h"
#include "process-util.h"
+#include "psi-util.h"
#include "selinux-util.h"
#include "set.h"
#include "smack-util.h"
condition_free(condition);
}
+TEST(condition_test_psi) {
+ Condition *condition;
+ CGroupMask mask;
+ int r;
+
+ if (!is_pressure_supported())
+ return (void) log_notice("Pressure Stall Information (PSI) is not supported, skipping %s", __func__);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "sbarabau", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "10%sbarabau", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "10% sbarabau", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "-10", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "10%/10min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "10min/10%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "10% 5min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "/5min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_IO_PRESSURE, "10s / ", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "100%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "0.0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "100%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "0.0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "0.01%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "0.0%/10sec", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "100.0% / 1min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_IO_PRESSURE, "50.0% / 1min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ r = cg_all_unified();
+ if (r < 0)
+ return (void) log_notice("Failed to determine whether the unified cgroups hierarchy is used, skipping %s", __func__);
+ if (r == 0)
+ return (void) log_notice("Requires the unified cgroups hierarchy, skipping %s", __func__);
+
+ if (cg_mask_supported(&mask) < 0)
+ return (void) log_notice("Failed to get supported cgroup controllers, skipping %s", __func__);
+
+ if (!FLAGS_SET(mask, CGROUP_MASK_MEMORY))
+ return (void) log_notice("Requires the cgroup memory controller, skipping %s", __func__);
+
+ if (!FLAGS_SET(mask, CGROUP_MASK_CPU))
+ return (void) log_notice("Requires the cgroup CPU controller, skipping %s", __func__);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, " : / ", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) < 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "hopefullythisisnotarealone.slice:100% / 10sec", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) > 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_CPU_PRESSURE, "-.slice:100.0% / 1min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "-.slice:0.0%/5min", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_MEMORY_PRESSURE, "-.slice:100.0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+
+ condition = condition_new(CONDITION_IO_PRESSURE, "-.slice:0.0%", false, false);
+ assert_se(condition);
+ assert_se(condition_test(condition, environ) >= 0);
+ condition_free(condition);
+}
+
DEFINE_TEST_MAIN(LOG_DEBUG);
AssertArchitecture=
AssertCapability=
AssertControlGroupController=
+AssertCPUPressure=
AssertDirectoryNotEmpty=
AssertFileIsExecutable=
AssertFileNotEmpty=
AssertFirstBoot=
AssertGroup=
AssertHost=
+AssertIOPressure=
AssertKernelCommandLine=
AssertKernelVersion=
+AssertMemoryPressure=
AssertNeedsUpdate=
AssertOSRelease=
AssertPathExists=
ConditionArchitecture=
ConditionCapability=
ConditionControlGroupController=
+ConditionCPUPressure=
ConditionDirectoryNotEmpty=
ConditionFileIsExecutable=
ConditionFileNotEmpty=
ConditionFirstBoot=
ConditionGroup=
ConditionHost=
+ConditionIOPressure=
ConditionKernelCommandLine=
ConditionKernelVersion=
+ConditionMemoryPressure=
ConditionNeedsUpdate=
ConditionOSRelease=
ConditionPathExists=
AllowIsolate=
AssertACPower=
AssertArchitecture=
+AssertCPUPressure=
AssertCPUs=
AssertCapability=
AssertControlGroupController=
AssertFirstBoot=
AssertGroup=
AssertHost=
+AssertIOPressure=
AssertKernelCommandLine=
AssertKernelVersion=
AssertMemory=
+AssertMemoryPressure=
AssertNeedsUpdate=
AssertOSRelease=
AssertPathExists=
CollectMode=
ConditionACPower=
ConditionArchitecture=
+ConditionCPUPressure=
ConditionCPUs=
ConditionFirmware=
ConditionCapability=
ConditionFirstBoot=
ConditionGroup=
ConditionHost=
+ConditionIOPressure=
ConditionKernelCommandLine=
ConditionKernelVersion=
ConditionMemory=
+ConditionMemoryPressure=
ConditionNeedsUpdate=
ConditionOSRelease=
ConditionPathExists=
projects / thirdparty / systemd.git / commitdiff
