Prep v226: Sync build files with upstream

[elogind.git] / README

diff --git a/README b/README
index 651aa983772549fe3966b5f5fb28baa73e5867ae..27cc9a01681829af75365e8c06272be4ffbe7dc9 100644 (file)
--- a/README
+++ b/README
@@ -36,8 +36,8 @@ LICENSE:
         - except src/udev/* which is (currently still) GPLv2, GPLv2+
 
 REQUIREMENTS:
-        Linux kernel >= 3.7
-        Linux kernel >= 3.8 for Smack support
+        Linux kernel >= 3.11
+        Linux kernel >= 4.2 for unified cgroup hierarchy support
 
         Kernel Config Options:
           CONFIG_DEVTMPFS
@@ -82,11 +82,11 @@ REQUIREMENTS:
           CONFIG_SECCOMP
           CONFIG_CHECKPOINT_RESTORE (for the kcmp() syscall)
 
-        Required for CPUShares in resource control unit settings
+        Required for CPUShares= in resource control unit settings
           CONFIG_CGROUP_SCHED
           CONFIG_FAIR_GROUP_SCHED
 
-        Required for CPUQuota in resource control unit settings
+        Required for CPUQuota= in resource control unit settings
           CONFIG_CFS_BANDWIDTH
 
         For systemd-bootchart, several proc debug interfaces are required:
@@ -97,6 +97,15 @@ REQUIREMENTS:
           CONFIG_EFIVAR_FS
           CONFIG_EFI_PARTITION
 
+        We recommend to turn off Real-Time group scheduling in the
+        kernel when using systemd. RT group scheduling effectively
+        makes RT scheduling unavailable for most userspace, since it
+        requires explicit assignment of RT budgets to each unit whose
+        processes making use of RT. As there's no sensible way to
+        assign these budgets automatically this cannot really be
+        fixed, and it's best to disable group scheduling hence.
+           CONFIG_RT_GROUP_SCHED=n
+
         Note that kernel auditing is broken when used with systemd's
         container code. When using systemd in conjunction with
         containers, please make sure to either turn off auditing at
@@ -140,8 +149,7 @@ REQUIREMENTS:
         dracut (optional)
         PolicyKit (optional)
 
-        When building from git, you need the following additional
-        dependencies:
+        When building from git, the following tools are needed:
 
         pkg-config
         docbook-xsl
@@ -155,6 +163,10 @@ REQUIREMENTS:
         python-lxml (optional, but required to build the indices)
         sphinx (optional)
 
+        The build system is initialized with ./autogen.sh. A tar ball
+        can be created with:
+          git archive --format=tar --prefix=systemd-222/ v222 | xz > systemd-222.tar.xz
+
         When systemd-hostnamed is used, it is strongly recommended to
         install nss-myhostname to ensure that, in a world of
         dynamically changing hostnames, the hostname stays resolvable
@@ -258,7 +270,7 @@ WARNINGS:
         false positives will be triggered by code which violates
         some rules but is actually safe.
 
-ENGINEERING AND CONSULTING SERVICES:
-        ENDOCODE <https://endocode.com/> offers professional
-        engineering and consulting services for systemd. Please
-        contact Chris Kühl <chris@endocode.com> for more information.
+        Currently, systemd-timesyncd defaults to use the Google NTP
+        servers if not specified otherwise at configure time. You
+        really should not ship an OS or device with this default
+        setting. See DISTRO_PORTING for details.