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What: /sys/kernel/mm/mempolicy/weighted_interleave/
Date: January 2024
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Configuration Interface for the Weighted Interleave policy
What: /sys/kernel/mm/mempolicy/weighted_interleave/nodeN
Date: January 2024
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Weight configuration interface for nodeN
The interleave weight for a memory node (N). These weights are
utilized by tasks which have set their mempolicy to
MPOL_WEIGHTED_INTERLEAVE.
These weights only affect new allocations, and changes at runtime
will not cause migrations on already allocated pages.
The minimum weight for a node is always 1.
Minimum weight: 1
Maximum weight: 255
Writing invalid values (i.e. any values not in [1,255],
empty string, ...) will return -EINVAL.
Changing the weight to a valid value will automatically
switch the system to manual mode as well.
What: /sys/kernel/mm/mempolicy/weighted_interleave/auto
Date: May 2025
Contact: Linux memory management mailing list <linux-mm@kvack.org>
Description: Auto-weighting configuration interface
Configuration mode for weighted interleave. 'true' indicates
that the system is in auto mode, and a 'false' indicates that
the system is in manual mode.
In auto mode, all node weights are re-calculated and overwritten
(visible via the nodeN interfaces) whenever new bandwidth data
is made available during either boot or hotplug events.
In manual mode, node weights can only be updated by the user.
Note that nodes that are onlined with previously set weights
will reuse those weights. If they were not previously set or
are onlined with missing bandwidth data, the weights will use
a default weight of 1.
Writing any true value string (e.g. Y or 1) will enable auto
mode, while writing any false value string (e.g. N or 0) will
enable manual mode. All other strings are ignored and will
return -EINVAL.
Writing a new weight to a node directly via the nodeN interface
will also automatically switch the system to manual mode.
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