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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-28 16:17:12 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-02-29 01:03:39 +0300 |
| commit | 1a2695a7465971f28d8c44d6a282b6a2dd91e96f (patch) | |
| tree | 4d590ff1f9a65223a85ef5ed8666020c4c2a317f /drivers/gpu/drm/i915/Kconfig.profile | |
| parent | 6e57cc39420c1d13d92c46ea662a7f9f5368f2ee (diff) | |
| download | linux-1a2695a7465971f28d8c44d6a282b6a2dd91e96f.tar.xz | |
drm/i915/gt: Expose timeslice duration to sysfs
Execlists uses a scheduling quantum (a timeslice) to alternate execution
between ready-to-run contexts of equal priority. This ensures that all
users (though only if they of equal importance) have the opportunity to
run and prevents livelocks where contexts may have implicit ordering due
to userspace semaphores.
The timeslicing mechanism can be compiled out with
./scripts/config --set-val DRM_I915_TIMESLICE_DURATION 0
The timeslice duration can be adjusted per-engine using,
/sys/class/drm/card?/engine/*/timeslice_duration_ms
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Steve Carbonari <steven.carbonari@intel.com>
Tested-by: Steve Carbonari <steven.carbonari@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200228131716.3243616-3-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/Kconfig.profile')
| -rw-r--r-- | drivers/gpu/drm/i915/Kconfig.profile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig.profile b/drivers/gpu/drm/i915/Kconfig.profile index c280b6ae38eb..d8d4a16179bd 100644 --- a/drivers/gpu/drm/i915/Kconfig.profile +++ b/drivers/gpu/drm/i915/Kconfig.profile @@ -73,4 +73,7 @@ config DRM_I915_TIMESLICE_DURATION is scheduled for execution for the timeslice duration, before switching to the next context. + This is adjustable via + /sys/class/drm/card?/engine/*/timeslice_duration_ms + May be 0 to disable timeslicing. |