drm/xe: add migrate ULLS period configfs attribute

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Add a configfs attribute to control the migrate ULLS period.
 
The migrate ULLS period specifies how long, in milliseconds, migrate
ULLS remains active before exiting. Migrate ULLS is currently used by
page-fault handling and SVM prefetch operations to process migration
work through a continuously running batch.
 
The attribute defaults to 5 ms. Setting the value to 0 disables ULLS.
 
This knob is primarily intended for performance tuning and evaluation,
allowing experimentation with the trade-off between reducing ULLS
startup/teardown overhead and limiting the time spent in a continuously
running migration workload.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Maarten Lankhorst <dev@lankhorst.se>
Link: https://patch.msgid.link/20260925201526.1355279-24-matthew.brost@intel.com

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This commit is contained in:

Matthew Brost 2026-09-25 13:15:25 -07:00

parent 085d8f468f

commit cb85dddfee

3 changed files with 82 additions and 6 deletions

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67

drivers/gpu/drm/xe/xe_configfs.c

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2

drivers/gpu/drm/xe/xe_configfs.h

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19

drivers/gpu/drm/xe/xe_migrate.c

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