NEWS: add blurbs about -Dmode= and oomd/oomctl
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NEWS
49
NEWS
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@ -495,17 +495,6 @@ CHANGES WITH 247 in spe:
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such as replay debuggers where non-deterministic behaviour is not
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such as replay debuggers where non-deterministic behaviour is not
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desirable.
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desirable.
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* When building systemd the Meson option
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-Dcompat-mutable-uid-boundaries may now be specified. If enabled,
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systemd reads the system UID boundaries from /etc/login.defs, instead
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of using the built-in values selected during build-time. This is an
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option to improve compatibility for upgrades from old systems. It's
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strongly recommended not to make use of this functionality on new
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systems (or even enable it during build), as it makes something
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runtime-configurable that is mostly an implementation detail of the
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OS, and permits avoidable differences in deployments that create all
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kinds of problems in the long run.
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* The autopaging logic in systemd's various tools (such as systemctl)
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* The autopaging logic in systemd's various tools (such as systemctl)
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has been updated to turn on "secure" mode in "less"
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has been updated to turn on "secure" mode in "less"
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(i.e. $LESSECURE=1) if execution in a "sudo" environment is
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(i.e. $LESSECURE=1) if execution in a "sudo" environment is
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@ -513,6 +502,44 @@ CHANGES WITH 247 in spe:
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via the pipe logic. This behaviour may be overridden via the new
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via the pipe logic. This behaviour may be overridden via the new
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$SYSTEMD_PAGERSECURE environment variable.
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$SYSTEMD_PAGERSECURE environment variable.
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* Units which have resource limits (.service, .mount, .swap, .slice,
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.socket, and .slice) gained new configuration settings
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ManagedOOMSwap=, ManagedOOMMemoryPressure=, and
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ManagedOOMMemoryPressureLimitPercent= that speicify resource pressure
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limits and optional action taken by systemd-oomd.
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* A new service systemd-oomd has been added. It monitors resource
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contention for selected parts of the unit hierarchy using the PSI
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information reported by the kernel, and kills processes when memory
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or swap pressure is above configured limits. This service is only
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enabled in developer mode (see below) and should be considered a
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preview in this release. Behaviour details and option names are
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subject to change without the usual backwards-compatibility promises.
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* A new helper oomctl has been added to introspect systemd-oomd state.
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If also is only available in developer mode and should be considered
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a preview without the usual backwards-compatibility promises.
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* New meson option -Dcompat-mutable-uid-boundaries= has been added. If
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enabled, systemd reads the system UID boundaries from /etc/login.defs
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at runtime, instead of using the built-in values selected during
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build. This is an option to improve compatibility for upgrades from
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old systems. It's strongly recommended not to make use of this
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functionality on new systems (or even enable it during build), as it
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makes something runtime-configurable that is mostly an implementation
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detail of the OS, and permits avoidable differences in deployments
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that create all kinds of problems in the long run.
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* New meson option '-Dmode=developer|release' has been added. When
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'developer', additional checks and features are enabled that are
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relevant during upstream development, e.g. verification that
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semi-automatically-generated documentation has been properly updated
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following API changes. Those checks are considered hints for
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developers and are not actionable in downstream builds. In addition,
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extra features that are not ready for general consumption may be
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enabled in developer mode. It is thus recommended to set
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'-Dmode=release' in end-user and distro builds.
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CHANGES WITH 246:
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CHANGES WITH 246:
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* The service manager gained basic support for cgroup v2 freezer. Units
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* The service manager gained basic support for cgroup v2 freezer. Units
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