[ANNOUNCE] systemd v238

[umut@xxxxxxxxxxxx (Umut Tezduyar Lindskog)]

Hello Zbigniew,

On Mon, Mar 5, 2018 at 11:37 PM, Zbigniew JÄ?drzejewski-Szmek
<zbyszek at in.waw.pl> wrote:
> Hi,
>
> systemd-238 has been tagged.
>
> https://github.com/systemd/systemd/archive/v238/systemd-238.tar.gz
>
> CHANGES WITH 238:
>
>         * The MemoryAccounting= unit property now defaults to on. After
>           discussions with the upstream control group maintainers we learnt
>           that the negative impact of cgroup memory accounting on current
>           kernels is finally relatively minimal, so that it should be safe to
>           enable this by default without affecting system performance. Besides
>           memory accounting only task accounting is turned on by default, all
>           other forms of resource accounting (CPU, IO, IP) remain off for now,
>           because it's not clear yet that their impact is small enough to move
>           from opt-in to opt-out. We recommend downstreams to leave memory
>           accounting on by default if kernel 4.14 or higher is are primarily
>           used. On very resource constrained systems or when support for old
>           kernels is a necessity, -Dmemory-accounting-default=false can be used
>           to revert this change.

Are these optimisations for v1 or v2? Do you have more resource you
can reference?

Thanks,
UMUT

>
>         * rpm scriptlets to update the udev hwdb and rules (%udev_hwdb_update,
>           %udev_rules_update) and the journal catalog (%journal_catalog_update)
>           from the upgrade scriptlets of individual packages now do nothing.
>           Transfiletriggers have been added which will perform those updates
>           once at the end of the transaction.
>
>           Similar transfiletriggers have been added to execute any sysctl.d
>           and binfmt.d rules. Thus, it should be unnecessary to provide any
>           scriptlets to execute this configuration from package installation
>           scripts.
>
>         * systemd-sysusers gained a mode where the configuration to execute is
>           specified on the command line, but this configuration is not executed
>           directly, but instead it is merged with the configuration on disk,
>           and the result is executed. This is useful for package installation
>           scripts which want to create the user before installing any files on
>           disk (in case some of those files are owned by that user), while
>           still allowing local admin overrides.
>
>           This functionality is exposed to rpm scriplets through a new
>           %sysusers_create_package macro. Old %sysusers_create and
>           %sysusers_create_inline macros are deprecated.
>
>           A transfiletrigger for sysusers.d configuration is now installed,
>           which means that it should be uncessary to call systemd-sysusers from
>           package installation scripts, unless the package installs any files
>           owned by those newly-created users, in which case
>           %sysusers_create_package should be used.
>
>         * Analogous change has been done for systemd-tmpfiles: it gained a mode
>           where the command-line configuration is merged with the configuration
>           on disk. This is exposed as the new %tmpfiles_create_package macro,
>           and %tmpfiles_create is deprecated. A transfiletrigger is installed
>           for tmpfiles.d, hence it should be unnecessary to call systemd-tmpfiles
>           from package installation scripts.
>
>         * sysusers.d configuration for a user may now also specify the group
>           number, in addition to the user number ("u username 123:456"), or
>           without the user number ("u username -:456").
>
>         * Configution items for systemd-sysusers can now be specified as
>           positional arguments when the new --inline switch is used.
>
>         * The login shell of users created through sysusers.d may now be
>           specified (previously, it was always /bin/sh for root and
>           /sbin/nologin for other users).
>
>         * systemd-analyze gained a new --global switch to look at global user
>           configuration. It also gained a unit-paths verb to list the unit load
>           paths that are compiled into systemd (which can be used with
>           --systemd, --user, or --global).
>
>         * udevadm trigger gained a new --settle/-w option to wait for any
>           triggered events to finish (but just those, and not any other events
>           which are triggered meanwhile).
>
>         * The action that systemd-logind takes when the lid is closed and the
>           machine is connected to external power can now be configured using
>           HandleLidSwitchExternalPower= in logind.conf. Previously, this action
>           was determined by HandleLidSwitch=, and, for backwards compatibility,
>           is still is, if HandleLidSwitchExternalPower= is not explicitly set.
>
>         * journalctl will periodically call sd_journal_process() to make it
>           resilient against inotify queue overruns when journal files are
>           rotated very quickly.
>
>         * Two new functions in libsystemd â?? sd_bus_get_n_queued_read and
>           sd_bus_get_n_queued_write â?? may be used to check the number of
>           pending bus messages.
>
>         * systemd gained a new
>           org.freedesktop.systemd1.Manager.AttachProcessesToUnit dbus call
>           which can be used to migrate foreign processes to scope and service
>           units. The primary user for this new API is systemd itself: the
>           systemd --user instance uses this call of the systemd --system
>           instance to migrate processes if it itself gets the request to
>           migrate processes and the kernel refuses this due to access
>           restrictions.  Thanks to this "systemd-run --scope --user â?¦" works
>           again in pure cgroups v2 environments when invoked from the user
>           session scope.
>
>         * A new TemporaryFileSystem= setting can be used to mask out part of
>           the real file system tree with tmpfs mounts. This may be combined
>           with BindPaths= and BindReadOnlyPaths= to hide files or directories
>           not relevant to the unit, while still allowing some paths lower in
>           the tree to be accessed.
>
>           ProtectHome=tmpfs may now be used to hide user home and runtime
>           directories from units, in a way that is mostly equivalent to
>           "TemporaryFileSystem=/home /run/user /root".
>
>         * Non-service units are now started with KeyringMode=shared by default.
>           This means that mount and swapon and other mount tools have access
>           to keys in the main keyring.
>
>         * /sys/fs/bpf is now mounted automatically.
>
>         * QNX virtualization is now detected by systemd-detect-virt and may
>           be used in ConditionVirtualization=.
>
>         * IPAccounting= may now be enabled also for slice units.
>
>         * A new -Dsplit-bin= build configuration switch may be used to specify
>           whether bin and sbin directories are merged, or if they should be
>           included separately in $PATH and various listings of executable
>           directories. The build configuration scripts will try to autodetect
>           the proper values of -Dsplit-usr= and -Dsplit-bin= based on build
>           system, but distributions are encouraged to configure this
>           explicitly.
>
>         * A new -Dok-color= build configuration switch may be used to change
>           the colour of "OK" status messages.
>
>         * UPGRADE ISSUE: serialization of units using JoinsNamespaceOf= with
>           PrivateNetwork=yes was buggy in previous versions of systemd. This
>           means that after the upgrade and daemon-reexec, any such units must
>           be restarted.
>
>         * INCOMPATIBILITY: as announced in the NEWS for 237, systemd-tmpfiles
>           will not exclude read-only files owned by root from cleanup.
>
>         Contributions from: Alan Jenkins, Alexander F Rødseth, Alexis Jeandet,
>         Andika Triwidada, Andrei Gherzan, Ansgar Burchardt, antizealot1337,
>         Batuhan Osman TaÅ?kaya, Beniamino Galvani, Bill Yodlowsky, Caio Marcelo
>         de Oliveira Filho, CuBiC, Daniele Medri, Daniel Mouritzen, Daniel
>         Rusek, Davide Cavalca, Dimitri John Ledkov, Douglas Christman, Evgeny
>         Vereshchagin, Faalagorn, Filipe Brandenburger, Franck Bui, futpib,
>         Giacomo Longo, Gunnar Hjalmarsson, Hans de Goede, Hermann Gausterer,
>         Iago López Galeiras, Jakub Filak, Jan Synacek, Jason A. Donenfeld,
>         Javier Martinez Canillas, Jérémy Rosen, Lennart Poettering, Lucas
>         Werkmeister, Mao Huang, Marco Gulino, Michael Biebl, Michael Vogt,
>         MilhouseVH, Neal Gompa (ã??ã?¼ã?«ã?»ã?´ã?³ã??), Oleander Reis, Olof Mogren,
>         Patrick Uiterwijk, Peter Hutterer, Peter Portante, Piotr DrÄ?g, Robert
>         Antoni Buj Gelonch, Sergey Ptashnick, Shawn Landden, Shuang Liu, Simon
>         Fowler, SjonHortensius, snorreflorre, Susant Sahani, Sylvain
>         Plantefève, Thomas Blume, Thomas Haller, Vito Caputo, Yu Watanabe,
>         Zbigniew JÄ?drzejewski-Szmek, Ð?аÑ?ко Ð?. Ð?оÑ?Ñ?иÑ? (Marko M. KostiÄ?)
>
>         â?? Warsaw, 2018-03-05
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