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pthread_nsg_attach - Attaches a thread to a NUMA Scheduling Group
long flags );
nsg Specifies the NUMA Scheduling Group (NSG) to which the thread will
Identifies the thread to attach to the NSG.
Specifies options (bit mask) that affect the attachment. See
DESCRIPTION for details.
The pthread_nsg_attach() function attaches the thread specified by the
thread argument to a NUMA Scheduling Group (NSG) specified by the nsg
argument. An NSG is a set of processes and/or threads that will be
constrained to reside on the same Resource Affinity Domain (RAD). That is,
the "home RAD" for all of the processes/threads in an NSG will be the same,
and the entire group will be migrated together, if at all. The thread
specified by thread will be removed from any NSG of which it might
currently be a member, before being added to the specified NSG.
If the specified thread resides on a different RAD, the thread will be
reassigned to a single RAD. The home RAD for the thread will be selected as
· If the specified NSG already has processes/threads attached, the home
RAD for the specified thread will be the home RAD for that NSG.
· If the specified NSG is empty, the home RAD for the thread will be
selected based on the setting of the flags argument.
The following options are defined for the flags argument:
The requested attachment and any implied reassignments are mandatory,
overriding any prior binding of the specified thread. If this option is
not set, and the thread is bound (RAD_INSIST) to a different RAD such
that the system cannot honor the request, the request will fail.
The thread has small memory requirements, so the system should favor
(for the home RAD) those RADs with light CPU loads, independent of
their available memory. This flag applies only when attaching to an
The thread has large memory requirements, so the system should favor
(for the home RAD) those RADs with more available memory, independent
of their CPU loads. This flag only applies when attaching to an empty
Arrange for the existing memory (stack pages) of a thread that is
assigned a new home RAD to be migrated to the new RAD. If omitted, only
newly allocated pages will be allocated on the new home RAD. Existing
pages will migrate if/when they experience a high rate of remote cache
misses. Migration will occur only for pages-in-memory objects that have
inherited the process's default memory allocation policy.
Wait for the requested memory migration to be completed. Effectively,
this flag specifies "migrate now!".
Failure. In this case, the returned integer indicates the type of
error. Possible errors include the following:
The caller does not have execute permission required to attach
the thread based on the NSG's permissions.
The thread specified by thread is hard attached (RAD_INSIST) to
RADs or has memory wired (locked) on its current RAD such that
it cannot be migrated to the common RAD selected for the NSG.
The value of the flags argument is invalid.
NSG_INSIST and NSG_MIGRATE were specified and no RAD can be
found with sufficient memory to accommodate the resulting
The thread specified by the thread argument does not exist.
Functions: nsg_attach_pid(3), nsg_get(3), numa_intro(3)
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