MemoryZSwapMax directive to configure new memory.zswap.max cgroup file

man/org.freedesktop.systemd1.xml

@@ -2707,6 +2707,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2eservice {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -3278,6 +3280,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2eservice {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -3858,6 +3862,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2eservice {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>
@@ -4595,6 +4601,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2esocket {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -5190,6 +5198,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2esocket {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -5764,6 +5774,8 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2esocket {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>
@@ -6390,6 +6402,8 @@ node /org/freedesktop/systemd1/unit/home_2emount {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -6913,6 +6927,8 @@ node /org/freedesktop/systemd1/unit/home_2emount {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -7405,6 +7421,8 @@ node /org/freedesktop/systemd1/unit/home_2emount {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>
@@ -8158,6 +8176,8 @@ node /org/freedesktop/systemd1/unit/dev_2dsda3_2eswap {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -8667,6 +8687,8 @@ node /org/freedesktop/systemd1/unit/dev_2dsda3_2eswap {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -9145,6 +9167,8 @@ node /org/freedesktop/systemd1/unit/dev_2dsda3_2eswap {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>
@@ -9757,6 +9781,8 @@ node /org/freedesktop/systemd1/unit/system_2eslice {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -9908,6 +9934,8 @@ node /org/freedesktop/systemd1/unit/system_2eslice {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -10066,6 +10094,8 @@ node /org/freedesktop/systemd1/unit/system_2eslice {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>
@@ -10246,6 +10276,8 @@ node /org/freedesktop/systemd1/unit/session_2d1_2escope {
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemorySwapMax = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+      readonly t MemoryZSwapMax = ...;
+      @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly t MemoryLimit = ...;
       @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
       readonly s DevicePolicy = '...';
@@ -10415,6 +10447,8 @@ node /org/freedesktop/systemd1/unit/session_2d1_2escope {
 
     <!--property MemorySwapMax is not documented!-->
 
+    <!--property MemoryZSwapMax is not documented!-->
+
     <!--property MemoryLimit is not documented!-->
 
     <!--property DevicePolicy is not documented!-->
@@ -10601,6 +10635,8 @@ node /org/freedesktop/systemd1/unit/session_2d1_2escope {
 
     <variablelist class="dbus-property" generated="True" extra-ref="MemorySwapMax"/>
 
+    <variablelist class="dbus-property" generated="True" extra-ref="MemoryZSwapMax"/>
+
     <variablelist class="dbus-property" generated="True" extra-ref="MemoryLimit"/>
 
     <variablelist class="dbus-property" generated="True" extra-ref="DevicePolicy"/>

man/systemd.resource-control.xml

@@ -325,14 +325,15 @@
 
       <varlistentry>
         <term><varname>MemorySwapMax=<replaceable>bytes</replaceable></varname></term>
+        <term><varname>MemoryZSwapMax=<replaceable>bytes</replaceable></varname></term>
 
         <listitem>
-          <para>Specify the absolute limit on swap usage of the executed processes in this unit.</para>
+          <para>Specify the absolute limit on (z)swap usage of the executed processes in this unit.</para>
 
           <para>Takes a swap size in bytes. If the value is suffixed with K, M, G or T, the specified swap size is
           parsed as Kilobytes, Megabytes, Gigabytes, or Terabytes (with the base 1024), respectively. If assigned the
-          special value <literal>infinity</literal>, no swap limit is applied. This controls the
+          special value <literal>infinity</literal>, no swap limit is applied. These settings control the
-          <literal>memory.swap.max</literal> control group attribute. For details about this control group attribute,
+          <literal>memory.(z)swap.max</literal> control group attributes. For details about these control group attributes,
           see <ulink url="https://docs.kernel.org/admin-guide/cgroup-v2.html#memory-interface-files">Memory Interface Files</ulink>.</para>
         </listitem>
       </varlistentry>

src/core/cgroup.c

@@ -151,6 +151,7 @@ void cgroup_context_init(CGroupContext *c) {
                 .memory_high = CGROUP_LIMIT_MAX,
                 .memory_max = CGROUP_LIMIT_MAX,
                 .memory_swap_max = CGROUP_LIMIT_MAX,
+                .memory_zswap_max = CGROUP_LIMIT_MAX,
 
                 .memory_limit = CGROUP_LIMIT_MAX,
 
@@ -354,6 +355,9 @@ static int unit_compare_memory_limit(Unit *u, const char *property_name, uint64_
         } else if (streq(property_name, "MemorySwapMax")) {
                 unit_value = c->memory_swap_max;
                 file = "memory.swap.max";
+        } else if (streq(property_name, "MemoryZSwapMax")) {
+                unit_value = c->memory_zswap_max;
+                file = "memory.zswap.max";
         } else
                 return -EINVAL;
 
@@ -396,9 +400,10 @@ static char *format_cgroup_memory_limit_comparison(char *buf, size_t l, Unit *u,
 
         /* memory.swap.max is special in that it relies on CONFIG_MEMCG_SWAP (and the default swapaccount=1).
          * In the absence of reliably being able to detect whether memcg swap support is available or not,
-         * only complain if the error is not ENOENT. */
+         * only complain if the error is not ENOENT. This is similarly the case for memory.zswap.max relying
+         * on CONFIG_ZSWAP. */
         if (r > 0 || IN_SET(r, -ENODATA, -EOWNERDEAD) ||
-            (r == -ENOENT && streq(property_name, "MemorySwapMax")))
+            (r == -ENOENT && STR_IN_SET(property_name, "MemorySwapMax", "MemoryZSwapMax")))
                 buf[0] = 0;
         else if (r < 0) {
                 errno = -r;
@@ -462,6 +467,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 "%sMemoryHigh: %" PRIu64 "%s\n"
                 "%sMemoryMax: %" PRIu64 "%s\n"
                 "%sMemorySwapMax: %" PRIu64 "%s\n"
+                "%sMemoryZSwapMax: %" PRIu64 "%s\n"
                 "%sMemoryLimit: %" PRIu64 "\n"
                 "%sTasksMax: %" PRIu64 "\n"
                 "%sDevicePolicy: %s\n"
@@ -498,6 +504,7 @@ void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
                 prefix, c->memory_high, format_cgroup_memory_limit_comparison(cdc, sizeof(cdc), u, "MemoryHigh"),
                 prefix, c->memory_max, format_cgroup_memory_limit_comparison(cdd, sizeof(cdd), u, "MemoryMax"),
                 prefix, c->memory_swap_max, format_cgroup_memory_limit_comparison(cde, sizeof(cde), u, "MemorySwapMax"),
+                prefix, c->memory_zswap_max, format_cgroup_memory_limit_comparison(cde, sizeof(cde), u, "MemoryZSwapMax"),
                 prefix, c->memory_limit,
                 prefix, tasks_max_resolve(&c->tasks_max),
                 prefix, cgroup_device_policy_to_string(c->device_policy),
@@ -1209,7 +1216,7 @@ static bool unit_has_unified_memory_config(Unit *u) {
 
         return unit_get_ancestor_memory_min(u) > 0 || unit_get_ancestor_memory_low(u) > 0 ||
                c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX ||
-               c->memory_swap_max != CGROUP_LIMIT_MAX;
+               c->memory_swap_max != CGROUP_LIMIT_MAX || c->memory_zswap_max != CGROUP_LIMIT_MAX;
 }
 
 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
@@ -1569,11 +1576,12 @@ static void cgroup_context_apply(
         if ((apply_mask & CGROUP_MASK_MEMORY) && !is_local_root) {
 
                 if (cg_all_unified() > 0) {
-                        uint64_t max, swap_max = CGROUP_LIMIT_MAX;
+                        uint64_t max, swap_max = CGROUP_LIMIT_MAX, zswap_max = CGROUP_LIMIT_MAX;
 
                         if (unit_has_unified_memory_config(u)) {
                                 max = c->memory_max;
                                 swap_max = c->memory_swap_max;
+                                zswap_max = c->memory_zswap_max;
                         } else {
                                 max = c->memory_limit;
 
@@ -1586,6 +1594,7 @@ static void cgroup_context_apply(
                         cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
                         cgroup_apply_unified_memory_limit(u, "memory.max", max);
                         cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
+                        cgroup_apply_unified_memory_limit(u, "memory.zswap.max", zswap_max);
 
                         (void) set_attribute_and_warn(u, "memory", "memory.oom.group", one_zero(c->memory_oom_group));
 

src/core/cgroup.h

@@ -149,6 +149,7 @@ struct CGroupContext {
         uint64_t memory_high;
         uint64_t memory_max;
         uint64_t memory_swap_max;
+        uint64_t memory_zswap_max;
 
         bool default_memory_min_set:1;
         bool default_memory_low_set:1;

src/core/dbus-cgroup.c

@@ -468,6 +468,7 @@ const sd_bus_vtable bus_cgroup_vtable[] = {
         SD_BUS_PROPERTY("MemoryHigh", "t", NULL, offsetof(CGroupContext, memory_high), 0),
         SD_BUS_PROPERTY("MemoryMax", "t", NULL, offsetof(CGroupContext, memory_max), 0),
         SD_BUS_PROPERTY("MemorySwapMax", "t", NULL, offsetof(CGroupContext, memory_swap_max), 0),
+        SD_BUS_PROPERTY("MemoryZSwapMax", "t", NULL, offsetof(CGroupContext, memory_zswap_max), 0),
         SD_BUS_PROPERTY("MemoryLimit", "t", NULL, offsetof(CGroupContext, memory_limit), 0),
         SD_BUS_PROPERTY("DevicePolicy", "s", property_get_cgroup_device_policy, offsetof(CGroupContext, device_policy), 0),
         SD_BUS_PROPERTY("DeviceAllow", "a(ss)", property_get_device_allow, 0, 0),
@@ -887,6 +888,7 @@ BUS_DEFINE_SET_CGROUP_WEIGHT(blockio_weight, CGROUP_MASK_BLKIO, CGROUP_BLKIO_WEI
 BUS_DEFINE_SET_CGROUP_LIMIT(memory, CGROUP_MASK_MEMORY, physical_memory_scale, 1);
 BUS_DEFINE_SET_CGROUP_LIMIT(memory_protection, CGROUP_MASK_MEMORY, physical_memory_scale, 0);
 BUS_DEFINE_SET_CGROUP_LIMIT(swap, CGROUP_MASK_MEMORY, physical_memory_scale, 0);
+BUS_DEFINE_SET_CGROUP_LIMIT(zswap, CGROUP_MASK_MEMORY, physical_memory_scale, 0);
 REENABLE_WARNING;
 
 static int bus_cgroup_set_cpu_weight(
@@ -1075,6 +1077,9 @@ int bus_cgroup_set_property(
         if (streq(name, "MemorySwapMax"))
                 return bus_cgroup_set_swap(u, name, &c->memory_swap_max, message, flags, error);
 
+        if (streq(name, "MemoryZSwapMax"))
+                return bus_cgroup_set_zswap(u, name, &c->memory_zswap_max, message, flags, error);
+
         if (streq(name, "MemoryMax"))
                 return bus_cgroup_set_memory(u, name, &c->memory_max, message, flags, error);
 
@@ -1115,6 +1120,9 @@ int bus_cgroup_set_property(
         if (streq(name, "MemorySwapMaxScale"))
                 return bus_cgroup_set_swap_scale(u, name, &c->memory_swap_max, message, flags, error);
 
+        if (streq(name, "MemoryZSwapMaxScale"))
+                return bus_cgroup_set_zswap_scale(u, name, &c->memory_zswap_max, message, flags, error);
+
         if (streq(name, "MemoryMaxScale"))
                 return bus_cgroup_set_memory_scale(u, name, &c->memory_max, message, flags, error);
 

src/core/load-fragment-gperf.gperf.in

@@ -205,6 +205,7 @@
 {{type}}.MemoryHigh,                       config_parse_memory_limit,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.MemoryMax,                        config_parse_memory_limit,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.MemorySwapMax,                    config_parse_memory_limit,                   0,                                  offsetof({{type}}, cgroup_context)
+{{type}}.MemoryZSwapMax,                   config_parse_memory_limit,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.MemoryLimit,                      config_parse_memory_limit,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.DeviceAllow,                      config_parse_device_allow,                   0,                                  offsetof({{type}}, cgroup_context)
 {{type}}.DevicePolicy,                     config_parse_device_policy,                  0,                                  offsetof({{type}}, cgroup_context.device_policy)

src/core/load-fragment.c

@@ -3826,7 +3826,7 @@ int config_parse_memory_limit(
                         bytes = physical_memory_scale(r, 10000U);
 
                 if (bytes >= UINT64_MAX ||
-                    (bytes <= 0 && !STR_IN_SET(lvalue, "MemorySwapMax", "MemoryLow", "MemoryMin", "DefaultMemoryLow", "DefaultMemoryMin"))) {
+                    (bytes <= 0 && !STR_IN_SET(lvalue, "MemorySwapMax", "MemoryZSwapMax", "MemoryLow", "MemoryMin", "DefaultMemoryLow", "DefaultMemoryMin"))) {
                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Memory limit '%s' out of range, ignoring.", rvalue);
                         return 0;
                 }
@@ -3850,6 +3850,8 @@ int config_parse_memory_limit(
                 c->memory_max = bytes;
         else if (streq(lvalue, "MemorySwapMax"))
                 c->memory_swap_max = bytes;
+        else if (streq(lvalue, "MemoryZSwapMax"))
+                c->memory_zswap_max = bytes;
         else if (streq(lvalue, "MemoryLimit")) {
                 log_syntax(unit, LOG_WARNING, filename, line, 0,
                            "Unit uses MemoryLimit=; please use MemoryMax= instead. Support for MemoryLimit= will be removed soon.");

src/shared/bus-print-properties.c

@@ -162,7 +162,7 @@ static int bus_print_property(const char *name, const char *expected_value, sd_b
 
                         bus_print_property_value(name, expected_value, flags, "[not set]");
 
-                else if ((STR_IN_SET(name, "DefaultMemoryLow", "DefaultMemoryMin", "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit", "MemoryAvailable") && u == CGROUP_LIMIT_MAX) ||
+                else if ((STR_IN_SET(name, "DefaultMemoryLow", "DefaultMemoryMin", "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryZSwapMax", "MemoryLimit", "MemoryAvailable") && u == CGROUP_LIMIT_MAX) ||
                          (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == UINT64_MAX) ||
                          (startswith(name, "Limit") && u == UINT64_MAX) ||
                          (startswith(name, "DefaultLimit") && u == UINT64_MAX))

src/shared/bus-unit-util.c

@@ -523,6 +523,7 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
                               "MemoryHigh",
                               "MemoryMax",
                               "MemorySwapMax",
+                              "MemoryZSwapMax",
                               "MemoryLimit",
                               "TasksMax")) {
 

src/systemctl/systemctl-show.c

@@ -250,6 +250,7 @@ typedef struct UnitStatusInfo {
         uint64_t memory_high;
         uint64_t memory_max;
         uint64_t memory_swap_max;
+        uint64_t memory_zswap_max;
         uint64_t memory_limit;
         uint64_t memory_available;
         uint64_t cpu_usage_nsec;
@@ -700,6 +701,7 @@ static void print_status_info(
                 if (i->memory_min > 0 || i->memory_low > 0 ||
                     i->memory_high != CGROUP_LIMIT_MAX || i->memory_max != CGROUP_LIMIT_MAX ||
                     i->memory_swap_max != CGROUP_LIMIT_MAX ||
+                    i->memory_zswap_max != CGROUP_LIMIT_MAX ||
                     i->memory_available != CGROUP_LIMIT_MAX ||
                     i->memory_limit != CGROUP_LIMIT_MAX) {
                         const char *prefix = "";
@@ -725,6 +727,10 @@ static void print_status_info(
                                 printf("%sswap max: %s", prefix, FORMAT_BYTES(i->memory_swap_max));
                                 prefix = " ";
                         }
+                        if (i->memory_zswap_max != CGROUP_LIMIT_MAX) {
+                                printf("%szswap max: %s", prefix, FORMAT_BYTES(i->memory_zswap_max));
+                                prefix = " ";
+                        }
                         if (i->memory_limit != CGROUP_LIMIT_MAX) {
                                 printf("%slimit: %s", prefix, FORMAT_BYTES(i->memory_limit));
                                 prefix = " ";
@@ -1935,6 +1941,7 @@ static int show_one(
                 { "MemoryHigh",                     "t",               NULL,           offsetof(UnitStatusInfo, memory_high)                       },
                 { "MemoryMax",                      "t",               NULL,           offsetof(UnitStatusInfo, memory_max)                        },
                 { "MemorySwapMax",                  "t",               NULL,           offsetof(UnitStatusInfo, memory_swap_max)                   },
+                { "MemoryZSwapMax",                 "t",               NULL,           offsetof(UnitStatusInfo, memory_zswap_max)                  },
                 { "MemoryLimit",                    "t",               NULL,           offsetof(UnitStatusInfo, memory_limit)                      },
                 { "CPUUsageNSec",                   "t",               NULL,           offsetof(UnitStatusInfo, cpu_usage_nsec)                    },
                 { "TasksCurrent",                   "t",               NULL,           offsetof(UnitStatusInfo, tasks_current)                     },
@@ -1969,6 +1976,7 @@ static int show_one(
                 .memory_high = CGROUP_LIMIT_MAX,
                 .memory_max = CGROUP_LIMIT_MAX,
                 .memory_swap_max = CGROUP_LIMIT_MAX,
+                .memory_zswap_max = CGROUP_LIMIT_MAX,
                 .memory_limit = UINT64_MAX,
                 .memory_available = CGROUP_LIMIT_MAX,
                 .cpu_usage_nsec = UINT64_MAX,

test/fuzz/fuzz-unit-file/directives-all.service

@@ -160,6 +160,7 @@ MemoryLimit=
 MemoryLow=
 MemoryMax=
 MemorySwapMax=
+MemoryZSwapMax=
 MessageQueueMaxMessages=
 MessageQueueMessageSize=
 MountAPIVFS=