From 6e6aaec20c62887fa5c5c4bf47a9c2238f8f027f Mon Sep 17 00:00:00 2001

From: rpm-build <rpm-build>

Date: Wed, 1 Aug 2018 13:19:39 +0200

Subject: [PATCH] pid1: bump DefaultTasksMax to 80% of the kernel pid.max value

This should be hopefully high enough even for the very big deployments.

RHEL-only

Related: #2138081

---

 man/systemd-system.conf.xml | 4 ++--

 src/core/main.c             | 2 +-

 src/core/system.conf.in     | 2 +-

 3 files changed, 4 insertions(+), 4 deletions(-)

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

index ac21c31d9a..00de04d426 100644

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

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

@@ -461,10 +461,10 @@

         <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. Defaults to 15% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>

+        of slice units. Defaults to 80% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>

         and root cgroup <varname>pids.max</varname>.

         Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores.

-        For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915,

+        For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 26214,

         but might be greater in other systems or smaller in OS containers.</para></listitem>

       </varlistentry>

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

index 14a4f81452..d3ec526e7e 100644

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

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

@@ -100,7 +100,7 @@

 #include <sanitizer/lsan_interface.h>

 #endif

-#define DEFAULT_TASKS_MAX ((TasksMax) { 15U, 100U }) /* 15% */

+#define DEFAULT_TASKS_MAX ((TasksMax) { 80U, 100U }) /* 80% */

 static enum {

         ACTION_RUN,

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

index 71a5869ec0..5d1f6d24f0 100644

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

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

@@ -56,7 +56,7 @@

 #DefaultIPAccounting=no

 #DefaultMemoryAccounting={{ 'yes' if MEMORY_ACCOUNTING_DEFAULT else 'no' }}

 #DefaultTasksAccounting=yes

-#DefaultTasksMax=15%

+#DefaultTasksMax=80%

 #DefaultLimitCPU=

 #DefaultLimitFSIZE=

 #DefaultLimitDATA=