Add support for two newer NUMA memory policies:
- MPOL_PREFERRED_MANY (Linux 5.15): like MPOL_PREFERRED but accepts
a set of nodes instead of a single node, falling back to all nodes
if preferred nodes cannot satisfy the allocation.
- MPOL_WEIGHTED_INTERLEAVE (Linux 6.9): like MPOL_INTERLEAVE but
distributes pages across nodes proportionally to per-node weights
configured via /sys/kernel/mm/mempolicy/weighted_interleave/.
On kernels that do not support the requested policy, set_mempolicy()
returns EINVAL. We convert EINVAL to EOPNOTSUPP only for the two new
policies (MPOL_PREFERRED_MANY, MPOL_WEIGHTED_INTERLEAVE), so that a
bad NUMAMask= for already-supported policies still fails the service
rather than being silently ignored.
The NUMA subsystem being absent (ENOSYS) continues to be handled
silently at debug level, as before.
Varlink serialization uses json_underscorify() on an owned copy of
the policy name string to convert hyphenated names to the underscore
form declared in the IDL enum, avoiding mutation of the read-only
static string table.
Signed-off-by: dongshengyuan <dongshengyuan@uniontech.com>
Until very recently all types defined by execute.h started with "Exec"
in the name. I think that was useful, since it made clear that the types
are associated with the ExecContext infrastructure. Let's hence restore
this.
(If we every move these types out of execute.h we should drop the "Exec"
prefix again. But today is not that day.)
No real code changes, just dumb renaming.
Follow-up to #40972. Convert remaining plain string fields to proper
varlink enum types across all interfaces, per the policy that
user-controlled/API fields should be declared as proper enums in the
IDL.
Interfaces converted:
- io.systemd.Manager — LogTarget, DefaultStandardOutput/Error,
DefaultMemory/CPU/IOPressureWatch, DefaultOOMPolicy,
CtrlAltDelBurstAction (8 fields)
- io.systemd.Unit — CPUSchedulingPolicy, IOSchedulingClass, NUMAPolicy,
MountFlags (4 fields)
- io.systemd.Machine — class, whom (2 fields, input dispatch converted
to JSON_DISPATCH_ENUM_DEFINE for automatic dashify fallback)
- io.systemd.oom / io.systemd.ManagedOOM — mode in ControlGroup (1
field)
Shared types moved to varlink-idl-common: ExecOutputType,
CGroupPressureWatch, EmergencyAction, ManagedOOMMode — these are reused
across multiple interfaces.
Each interface change includes a corresponding enum sync test to catch
future drift between C string tables and varlink IDL definitions.
Convert CPUSchedulingPolicy, IOSchedulingClass, NUMAPolicy and MountFlags
fields from plain strings to proper varlink enum types in the io.systemd.Unit
interface. Update the corresponding serialization code to use
json_underscorify() for correct enum value formatting.
Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
I promised in https://github.com/systemd/systemd/pull/41426 that its the
final update for coccinelle pointer deref checks. However it turned out
there is this coccinelle/parsing_hacks.h that I wasn't aware of. The
file missed some important things like _cleanup_(x) that prevented
coccinelle to check a bunch of functions.
This PR adds some missing defines to the parsing_hacks.h and fixes the
missing asserts(). I apologize that its a bit long (and frankly boring)
and that I missed this earlier.
The last commit contains one small behavior change (ret in
sd_varlink_idl_parse() is now really optional) but the big one is very
mechanical.
The updated parsing_hacks.h file uncovered a bunch of extra
things that the check-pointer-deref coccinelle script flags.
This commit fixes them to make the tree check-pointer-deref clean.
Define proper varlink enum types for unit configuration settings that
are part of the user-facing API (values users/clients can select).
This replaces SD_VARLINK_STRING with SD_VARLINK_DEFINE_FIELD_BY_TYPE
for these fields, giving them strong type semantics in the IDL.
Enum types added for ExecContext (ExecInputType, ExecOutputType,
ExecUtmpMode, ExecPreserveMode, ExecKeyringMode, MemoryTHP,
ProtectProc, ProcSubset, ProtectSystem, ProtectHome, PrivateTmp,
PrivateUsers, ProtectHostname, ProtectControlGroups, PrivatePIDs,
PrivateBPF), CGroupContext (CGroupDevicePolicy, ManagedOOMMode,
ManagedOOMPreference, CGroupPressureWatch, NFTSetSource, NFProto,
BPFCGroupAttachType, CGroupController), and UnitContext (CollectMode,
EmergencyAction, JobMode).
Engine-reported runtime state fields (Type, LoadState, ActiveState,
FreezerState, SubState, UnitFileState) remain as strings since only
the engine selects those values.
Currently mount options are handled in such a way that the first
definition for a given partition wins, and documented as such.
Change them so that they behave like other options, and the
last specified wins.
Applies to RootImageOptions=, MountImages= and ExtensionImages=.
Switch from a linked list to an array indexed by the partition
specifier to store them.
Transparent Hugepages (THP) is a Linux kernel feature that manages
memory using larger pages (2MB on x86, compared to the default 4KB).
The main goal is to improve memory management efficiency and system
performance, especially for memory-intensive applications.
However, it can cause drawbacks in some scenarios, such as memory
regression and latency spikes. THP policy is governed for the entire
system via /sys/kernel/mm/transparent_hugepage/enabled.
However, it can be overridden for individual workloads via prctl(2)
call.
MemoryTHP= is used to disable THPs at exec-invoke to stop
providing THPs for workloads where the drawbacks outweigh the advantages.
When set to "disable", MemoryTHP= disables THPs completely for the
process, irrespecitive of global THP controls.
When set to "madvise", MemoryTHP= disables THPs for the process except
when specifically madvised by the process with MADV_HUGEPAGE or MADV_COLLAPSE.
This allows a service to reuse the user namespace created for an
existing service, similarly to NetworkNamespacePath=. The configuration
is the initial user namespace (e.g. ID mapping) is preserved.
dongshengyuan
Lennart Poettering
Ivan Kruglov
Zbigniew Jędrzejewski-Szmek
Michael Vogt
Mike Yuan
Yu Watanabe
Luca Boccassi
Usama Arif
Jelle van der Waa
Lennart Poettering
Quentin Deslandes