From fc7fdb72096d2baeec3238a0ef324569a05da4ae Mon Sep 17 00:00:00 2001

From: Lennart Poettering <lennart@poettering.net>

Date: Fri, 13 Nov 2015 17:13:55 +0100

Subject: [PATCH] core: add new DefaultTasksMax= setting for system.conf

This allows initializing the TasksMax= setting of all units by default

to some fixed value, instead of leaving it at infinity as before.

Cherry-picked from: 0af20ea2ee2af2bcf2258e7a8e1a13181a6a75d6

Related: #1337244

---

 man/systemd-system.conf.xml           | 13 ++++++++++++-

 man/systemd.resource-control.xml      |  5 ++++-

 src/core/dbus-manager.c               |  1 +

 src/core/load-fragment-gperf.gperf.m4 |  2 +-

 src/core/load-fragment.c              |  7 ++++---

 src/core/main.c                       |  3 +++

 src/core/manager.h                    |  1 +

 src/core/system.conf                  |  2 ++

 src/core/unit.c                       |  3 +++

 src/shared/cgroup-util.c              |  3 ++-

 10 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml

index d367ccd13..53e8ff665 100644

--- a/man/systemd-system.conf.xml

+++ b/man/systemd-system.conf.xml

@@ -1,4 +1,4 @@

- 

+ 

   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

@@ -319,6 +319,17 @@

         for details on the per-unit settings.</para></listitem>

       </varlistentry>

+      <varlistentry>

+        <term><varname>DefaultTasksMax=</varname></term>

+

+        <listitem><para>Configure the default value for the per-unit

+        <varname>TasksMax=</varname> setting. See

+        <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>

+        for details. This setting applies to all unit types that

+        support resource control settings, with the exception of slice

+        units.</para></listitem>

+      </varlistentry>

+

       <varlistentry>

         <term><varname>DefaultLimitCPU=</varname></term>

         <term><varname>DefaultLimitFSIZE=</varname></term>

diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml

index 6b9329bbe..217105ee5 100644

--- a/man/systemd.resource-control.xml

+++ b/man/systemd.resource-control.xml

@@ -231,7 +231,10 @@

           see 

           url="https://www.kernel.org/doc/Documentation/cgroups/pids.txt">pids.txt</ulink>.</para>

-          <para>Implies <literal>TasksAccounting=true</literal>.</para>

+          <para>Implies <literal>TasksAccounting=true</literal>. The

+          system default for this setting may be controlled with

+          <varname>DefaultTasksMax=</varname> in

+          <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

         </listitem>

       </varlistentry>

diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c

index 7ba1b519e..c92f8c6bf 100644

--- a/src/core/dbus-manager.c

+++ b/src/core/dbus-manager.c

@@ -2039,6 +2039,7 @@ const sd_bus_vtable bus_manager_vtable[] = {

         SD_BUS_WRITABLE_PROPERTY("ShutdownWatchdogUSec", "t", bus_property_get_usec, bus_property_set_usec, offsetof(Manager, shutdown_watchdog), 0),

         SD_BUS_PROPERTY("ControlGroup", "s", NULL, offsetof(Manager, cgroup_root), 0),

         SD_BUS_PROPERTY("SystemState", "s", property_get_system_state, 0, 0),

+        SD_BUS_PROPERTY("DefaultTasksMax", "t", NULL, offsetof(Manager, default_tasks_max), SD_BUS_VTABLE_PROPERTY_CONST),

         SD_BUS_METHOD("GetUnit", "s", "o", method_get_unit, SD_BUS_VTABLE_UNPRIVILEGED),

         SD_BUS_METHOD("GetUnitByPID", "u", "o", method_get_unit_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),

diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4

index 26e4c618e..b2fe627af 100644

--- a/src/core/load-fragment-gperf.gperf.m4

+++ b/src/core/load-fragment-gperf.gperf.m4

@@ -126,7 +126,7 @@ $1.BlockIODeviceWeight,          config_parse_blockio_device_weight, 0,

 $1.BlockIOReadBandwidth,         config_parse_blockio_bandwidth,     0,                             offsetof($1, cgroup_context)

 $1.BlockIOWriteBandwidth,        config_parse_blockio_bandwidth,     0,                             offsetof($1, cgroup_context)

 $1.TasksAccounting,              config_parse_bool,                  0,                             offsetof($1, cgroup_context.tasks_accounting)

-$1.TasksMax,                     config_parse_tasks_max,             0,                             offsetof($1, cgroup_context)

+$1.TasksMax,                     config_parse_tasks_max,             0,                             offsetof($1, cgroup_context.tasks_max)

 $1.Delegate,                     config_parse_bool,                  0,                             offsetof($1, cgroup_context.delegate)'

 )m4_dnl

 Unit.Description,                config_parse_unit_string_printf,    0,                             offsetof(Unit, description)

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c

index 7d2e737d0..c1ffee2c7 100644

--- a/src/core/load-fragment.c

+++ b/src/core/load-fragment.c

@@ -3081,12 +3081,11 @@ int config_parse_tasks_max(

                 void *data,

                 void *userdata) {

-        CGroupContext *c = data;

-        uint64_t u;

+        uint64_t *tasks_max = data, u;

         int r;

         if (isempty(rvalue) || streq(rvalue, "infinity")) {

-                c->tasks_max = (uint64_t) -1;

+                *tasks_max = (uint64_t) -1;

                 return 0;

         }

@@ -3096,6 +3095,8 @@ int config_parse_tasks_max(

                 return 0;

         }

+        *tasks_max = u;

+

         return 0;

 }

diff --git a/src/core/main.c b/src/core/main.c

index aca05a535..50c9714f7 100644

--- a/src/core/main.c

+++ b/src/core/main.c

@@ -118,6 +118,7 @@ static bool arg_default_blockio_accounting = false;

 static bool arg_default_memory_accounting = false;

 static EmergencyAction arg_cad_burst_action = EMERGENCY_ACTION_REBOOT_FORCE;

 static bool arg_default_tasks_accounting = false;

+static uint64_t arg_default_tasks_max = (uint64_t) -1;

 static void nop_handler(int sig) {}

@@ -678,6 +679,7 @@ static int parse_config_file(void) {

                 { "Manager", "DefaultMemoryAccounting",   config_parse_bool,             0, &arg_default_memory_accounting         },

                 { "Manager", "CtrlAltDelBurstAction",     config_parse_emergency_action, 0, &arg_cad_burst_action                  },

                 { "Manager", "DefaultTasksAccounting",    config_parse_bool,             0, &arg_default_tasks_accounting          },

+                { "Manager", "DefaultTasksMax",           config_parse_tasks_max,        0, &arg_default_tasks_max                 },

                 {}

         };

@@ -1688,6 +1690,7 @@ int main(int argc, char *argv[]) {

         m->default_blockio_accounting = arg_default_blockio_accounting;

         m->default_memory_accounting = arg_default_memory_accounting;

         m->default_tasks_accounting = arg_default_tasks_accounting;

+        m->default_tasks_max = arg_default_tasks_max;

         m->runtime_watchdog = arg_runtime_watchdog;

         m->shutdown_watchdog = arg_shutdown_watchdog;

diff --git a/src/core/manager.h b/src/core/manager.h

index 96dcd83dc..e91e7bd8b 100644

--- a/src/core/manager.h

+++ b/src/core/manager.h

@@ -263,6 +263,7 @@ struct Manager {

         bool default_blockio_accounting;

         bool default_tasks_accounting;

+        uint64_t default_tasks_max;

         usec_t default_timer_accuracy_usec;

         struct rlimit *rlimit[_RLIMIT_MAX];

diff --git a/src/core/system.conf b/src/core/system.conf

index a11f59903..91ef01cd0 100644

--- a/src/core/system.conf

+++ b/src/core/system.conf

@@ -40,6 +40,8 @@

 #DefaultCPUAccounting=no

 #DefaultBlockIOAccounting=no

 #DefaultMemoryAccounting=no

+#DefaultTasksAccounting=no

+#DefaultTasksMax=

 #DefaultLimitCPU=

 #DefaultLimitFSIZE=

 #DefaultLimitDATA=

diff --git a/src/core/unit.c b/src/core/unit.c

index 2fcb4fbf0..6a2ad6ed3 100644

--- a/src/core/unit.c

+++ b/src/core/unit.c

@@ -127,6 +127,9 @@ static void unit_init(Unit *u) {

                 cc->blockio_accounting = u->manager->default_blockio_accounting;

                 cc->memory_accounting = u->manager->default_memory_accounting;

                 cc->tasks_accounting = u->manager->default_tasks_accounting;

+

+                if (u->type != UNIT_SLICE)

+                        cc->tasks_max = u->manager->default_tasks_max;

         }

         ec = unit_get_exec_context(u);

diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c

index cf757d2b2..c5d9e4bb5 100644

--- a/src/shared/cgroup-util.c

+++ b/src/shared/cgroup-util.c

@@ -1606,7 +1606,8 @@ static const char mask_names[] =

         "cpuacct\0"

         "blkio\0"

         "memory\0"

-        "devices\0";

+        "devices\0"

+        "pids\0";

 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {

         CGroupControllerMask bit = 1;