dongshengyuan c99674a408 numa: add support for preferred-many and weighted-interleave policies ...

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>

2026-06-28 13:40:07 +09:00

333 KiB

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