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NEWS: add blurbs about -Dmode= and oomd/oomctl

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Zbigniew Jędrzejewski-Szmek 2020-10-15 15:56:05 +02:00
parent d58c5f0fe7
commit 6e88f9e710
1 changed files with 38 additions and 11 deletions
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NEWS
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@ -495,17 +495,6 @@ CHANGES WITH 247 in spe:
such as replay debuggers where non-deterministic behaviour is not
desirable.
* When building systemd the Meson option
-Dcompat-mutable-uid-boundaries may now be specified. If enabled,
systemd reads the system UID boundaries from /etc/login.defs, instead
of using the built-in values selected during build-time. This is an
option to improve compatibility for upgrades from old systems. It's
strongly recommended not to make use of this functionality on new
systems (or even enable it during build), as it makes something
runtime-configurable that is mostly an implementation detail of the
OS, and permits avoidable differences in deployments that create all
kinds of problems in the long run.
* The autopaging logic in systemd's various tools (such as systemctl)
has been updated to turn on "secure" mode in "less"
(i.e. $LESSECURE=1) if execution in a "sudo" environment is
@ -513,6 +502,44 @@ CHANGES WITH 247 in spe:
via the pipe logic. This behaviour may be overridden via the new
$SYSTEMD_PAGERSECURE environment variable.
* Units which have resource limits (.service, .mount, .swap, .slice,
.socket, and .slice) gained new configuration settings
ManagedOOMSwap=, ManagedOOMMemoryPressure=, and
ManagedOOMMemoryPressureLimitPercent= that speicify resource pressure
limits and optional action taken by systemd-oomd.
* A new service systemd-oomd has been added. It monitors resource
contention for selected parts of the unit hierarchy using the PSI
information reported by the kernel, and kills processes when memory
or swap pressure is above configured limits. This service is only
enabled in developer mode (see below) and should be considered a
preview in this release. Behaviour details and option names are
subject to change without the usual backwards-compatibility promises.
* A new helper oomctl has been added to introspect systemd-oomd state.
If also is only available in developer mode and should be considered
a preview without the usual backwards-compatibility promises.
* New meson option -Dcompat-mutable-uid-boundaries= has been added. If
enabled, systemd reads the system UID boundaries from /etc/login.defs
at runtime, instead of using the built-in values selected during
build. This is an option to improve compatibility for upgrades from
old systems. It's strongly recommended not to make use of this
functionality on new systems (or even enable it during build), as it
makes something runtime-configurable that is mostly an implementation
detail of the OS, and permits avoidable differences in deployments
that create all kinds of problems in the long run.
* New meson option '-Dmode=developer|release' has been added. When
'developer', additional checks and features are enabled that are
relevant during upstream development, e.g. verification that
semi-automatically-generated documentation has been properly updated
following API changes. Those checks are considered hints for
developers and are not actionable in downstream builds. In addition,
extra features that are not ready for general consumption may be
enabled in developer mode. It is thus recommended to set
'-Dmode=release' in end-user and distro builds.
CHANGES WITH 246:
* The service manager gained basic support for cgroup v2 freezer. Units