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From 6e6aaec20c62887fa5c5c4bf47a9c2238f8f027f Mon Sep 17 00:00:00 2001
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From: rpm-build <rpm-build>
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Date: Wed, 1 Aug 2018 13:19:39 +0200
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Subject: [PATCH] pid1: bump DefaultTasksMax to 80% of the kernel pid.max value
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This should be hopefully high enough even for the very big deployments.
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RHEL-only
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Related: #2138081
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---
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man/systemd-system.conf.xml | 4 ++--
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src/core/main.c | 2 +-
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src/core/system.conf.in | 2 +-
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3 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml
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index ac21c31d9a..00de04d426 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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@@ -461,10 +461,10 @@
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<listitem><para>Configure the default value for the per-unit <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 support resource control settings, with the exception
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- of slice units. Defaults to 15% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>
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+ of slice units. Defaults to 80% of the minimum of <varname>kernel.pid_max=</varname>, <varname>kernel.threads-max=</varname>
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and root cgroup <varname>pids.max</varname>.
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Kernel has a default value for <varname>kernel.pid_max=</varname> and an algorithm of counting in case of more than 32 cores.
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- For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 4915,
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+ For example with the default <varname>kernel.pid_max=</varname>, <varname>DefaultTasksMax=</varname> defaults to 26214,
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but might be greater in other systems or smaller in OS containers.</para></listitem>
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</varlistentry>
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diff --git a/src/core/main.c b/src/core/main.c
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index 14a4f81452..d3ec526e7e 100644
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--- a/src/core/main.c
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+++ b/src/core/main.c
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@@ -100,7 +100,7 @@
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#include <sanitizer/lsan_interface.h>
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#endif
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-#define DEFAULT_TASKS_MAX ((TasksMax) { 15U, 100U }) /* 15% */
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+#define DEFAULT_TASKS_MAX ((TasksMax) { 80U, 100U }) /* 80% */
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static enum {
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ACTION_RUN,
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diff --git a/src/core/system.conf.in b/src/core/system.conf.in
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index 71a5869ec0..5d1f6d24f0 100644
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--- a/src/core/system.conf.in
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+++ b/src/core/system.conf.in
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@@ -56,7 +56,7 @@
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#DefaultIPAccounting=no
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#DefaultMemoryAccounting={{ 'yes' if MEMORY_ACCOUNTING_DEFAULT else 'no' }}
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#DefaultTasksAccounting=yes
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-#DefaultTasksMax=15%
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+#DefaultTasksMax=80%
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#DefaultLimitCPU=
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#DefaultLimitFSIZE=
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#DefaultLimitDATA=
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