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From fc7fdb72096d2baeec3238a0ef324569a05da4ae Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 13 Nov 2015 17:13:55 +0100
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Subject: [PATCH] core: add new DefaultTasksMax= setting for system.conf
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This allows initializing the TasksMax= setting of all units by default
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to some fixed value, instead of leaving it at infinity as before.
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Cherry-picked from: 0af20ea2ee2af2bcf2258e7a8e1a13181a6a75d6
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Related: #1337244
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---
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 man/systemd-system.conf.xml           | 13 ++++++++++++-
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 man/systemd.resource-control.xml      |  5 ++++-
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 src/core/dbus-manager.c               |  1 +
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 src/core/load-fragment-gperf.gperf.m4 |  2 +-
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 src/core/load-fragment.c              |  7 ++++---
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 src/core/main.c                       |  3 +++
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 src/core/manager.h                    |  1 +
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 src/core/system.conf                  |  2 ++
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 src/core/unit.c                       |  3 +++
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 src/shared/cgroup-util.c              |  3 ++-
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 10 files changed, 33 insertions(+), 7 deletions(-)
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diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml
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index d367ccd130..53e8ff665a 100644
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--- a/man/systemd-system.conf.xml
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+++ b/man/systemd-system.conf.xml
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@@ -1,4 +1,4 @@
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- 
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+ 
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   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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@@ -319,6 +319,17 @@
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         for details on the per-unit settings.</para></listitem>
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       </varlistentry>
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+      <varlistentry>
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+        <term><varname>DefaultTasksMax=</varname></term>
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+
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+        <listitem><para>Configure the default value for the per-unit
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+        <varname>TasksMax=</varname> setting. See
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+        <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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+        for details. This setting applies to all unit types that
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+        support resource control settings, with the exception of slice
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+        units.</para></listitem>
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+      </varlistentry>
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+
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       <varlistentry>
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         <term><varname>DefaultLimitCPU=</varname></term>
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         <term><varname>DefaultLimitFSIZE=</varname></term>
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diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
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index 6b9329bbee..217105ee5a 100644
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--- a/man/systemd.resource-control.xml
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+++ b/man/systemd.resource-control.xml
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@@ -231,7 +231,10 @@
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           see 
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           url="https://www.kernel.org/doc/Documentation/cgroups/pids.txt">pids.txt</ulink>.</para>
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-          <para>Implies <literal>TasksAccounting=true</literal>.</para>
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+          <para>Implies <literal>TasksAccounting=true</literal>. The
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+          system default for this setting may be controlled with
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+          <varname>DefaultTasksMax=</varname> in
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+          <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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         </listitem>
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       </varlistentry>
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diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
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index 7ba1b519ea..c92f8c6bfc 100644
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--- a/src/core/dbus-manager.c
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+++ b/src/core/dbus-manager.c
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@@ -2039,6 +2039,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
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         SD_BUS_WRITABLE_PROPERTY("ShutdownWatchdogUSec", "t", bus_property_get_usec, bus_property_set_usec, offsetof(Manager, shutdown_watchdog), 0),
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         SD_BUS_PROPERTY("ControlGroup", "s", NULL, offsetof(Manager, cgroup_root), 0),
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         SD_BUS_PROPERTY("SystemState", "s", property_get_system_state, 0, 0),
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+        SD_BUS_PROPERTY("DefaultTasksMax", "t", NULL, offsetof(Manager, default_tasks_max), SD_BUS_VTABLE_PROPERTY_CONST),
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         SD_BUS_METHOD("GetUnit", "s", "o", method_get_unit, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("GetUnitByPID", "u", "o", method_get_unit_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
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diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
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index 26e4c618ee..b2fe627af3 100644
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--- a/src/core/load-fragment-gperf.gperf.m4
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+++ b/src/core/load-fragment-gperf.gperf.m4
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@@ -126,7 +126,7 @@ $1.BlockIODeviceWeight,          config_parse_blockio_device_weight, 0,
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 $1.BlockIOReadBandwidth,         config_parse_blockio_bandwidth,     0,                             offsetof($1, cgroup_context)
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 $1.BlockIOWriteBandwidth,        config_parse_blockio_bandwidth,     0,                             offsetof($1, cgroup_context)
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 $1.TasksAccounting,              config_parse_bool,                  0,                             offsetof($1, cgroup_context.tasks_accounting)
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-$1.TasksMax,                     config_parse_tasks_max,             0,                             offsetof($1, cgroup_context)
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+$1.TasksMax,                     config_parse_tasks_max,             0,                             offsetof($1, cgroup_context.tasks_max)
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 $1.Delegate,                     config_parse_bool,                  0,                             offsetof($1, cgroup_context.delegate)'
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 )m4_dnl
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 Unit.Description,                config_parse_unit_string_printf,    0,                             offsetof(Unit, description)
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diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
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index 7d2e737d05..c1ffee2c7e 100644
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--- a/src/core/load-fragment.c
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+++ b/src/core/load-fragment.c
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@@ -3081,12 +3081,11 @@ int config_parse_tasks_max(
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                 void *data,
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                 void *userdata) {
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-        CGroupContext *c = data;
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-        uint64_t u;
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+        uint64_t *tasks_max = data, u;
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         int r;
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         if (isempty(rvalue) || streq(rvalue, "infinity")) {
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-                c->tasks_max = (uint64_t) -1;
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+                *tasks_max = (uint64_t) -1;
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                 return 0;
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         }
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@@ -3096,6 +3095,8 @@ int config_parse_tasks_max(
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                 return 0;
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         }
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+        *tasks_max = u;
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+
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         return 0;
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 }
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diff --git a/src/core/main.c b/src/core/main.c
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index aca05a5358..50c9714f78 100644
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--- a/src/core/main.c
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+++ b/src/core/main.c
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@@ -118,6 +118,7 @@ static bool arg_default_blockio_accounting = false;
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 static bool arg_default_memory_accounting = false;
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 static EmergencyAction arg_cad_burst_action = EMERGENCY_ACTION_REBOOT_FORCE;
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 static bool arg_default_tasks_accounting = false;
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+static uint64_t arg_default_tasks_max = (uint64_t) -1;
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 static void nop_handler(int sig) {}
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@@ -678,6 +679,7 @@ static int parse_config_file(void) {
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                 { "Manager", "DefaultMemoryAccounting",   config_parse_bool,             0, &arg_default_memory_accounting         },
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                 { "Manager", "CtrlAltDelBurstAction",     config_parse_emergency_action, 0, &arg_cad_burst_action                  },
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                 { "Manager", "DefaultTasksAccounting",    config_parse_bool,             0, &arg_default_tasks_accounting          },
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+                { "Manager", "DefaultTasksMax",           config_parse_tasks_max,        0, &arg_default_tasks_max                 },
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                 {}
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         };
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@@ -1688,6 +1690,7 @@ int main(int argc, char *argv[]) {
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         m->default_blockio_accounting = arg_default_blockio_accounting;
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         m->default_memory_accounting = arg_default_memory_accounting;
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         m->default_tasks_accounting = arg_default_tasks_accounting;
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+        m->default_tasks_max = arg_default_tasks_max;
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         m->runtime_watchdog = arg_runtime_watchdog;
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         m->shutdown_watchdog = arg_shutdown_watchdog;
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diff --git a/src/core/manager.h b/src/core/manager.h
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index 96dcd83dc0..e91e7bd8b3 100644
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--- a/src/core/manager.h
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+++ b/src/core/manager.h
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@@ -263,6 +263,7 @@ struct Manager {
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         bool default_blockio_accounting;
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         bool default_tasks_accounting;
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+        uint64_t default_tasks_max;
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         usec_t default_timer_accuracy_usec;
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         struct rlimit *rlimit[_RLIMIT_MAX];
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diff --git a/src/core/system.conf b/src/core/system.conf
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index a11f599038..91ef01cd0f 100644
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--- a/src/core/system.conf
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+++ b/src/core/system.conf
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@@ -40,6 +40,8 @@
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 #DefaultCPUAccounting=no
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 #DefaultBlockIOAccounting=no
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 #DefaultMemoryAccounting=no
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+#DefaultTasksAccounting=no
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+#DefaultTasksMax=
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 #DefaultLimitCPU=
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 #DefaultLimitFSIZE=
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 #DefaultLimitDATA=
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 2fcb4fbf07..6a2ad6ed38 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -127,6 +127,9 @@ static void unit_init(Unit *u) {
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                 cc->blockio_accounting = u->manager->default_blockio_accounting;
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                 cc->memory_accounting = u->manager->default_memory_accounting;
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                 cc->tasks_accounting = u->manager->default_tasks_accounting;
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+
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+                if (u->type != UNIT_SLICE)
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+                        cc->tasks_max = u->manager->default_tasks_max;
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         }
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         ec = unit_get_exec_context(u);
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diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c
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index cf757d2b23..c5d9e4bb58 100644
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--- a/src/shared/cgroup-util.c
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+++ b/src/shared/cgroup-util.c
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@@ -1606,7 +1606,8 @@ static const char mask_names[] =
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         "cpuacct\0"
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         "blkio\0"
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         "memory\0"
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-        "devices\0";
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+        "devices\0"
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+        "pids\0";
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 int cg_create_everywhere(CGroupControllerMask supported, CGroupControllerMask mask, const char *path) {
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         CGroupControllerMask bit = 1;