1. 05 Jun, 2019 17 commits
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  3. 01 Jun, 2019 1 commit
  4. 31 May, 2019 1 commit
    • Chris Wilson's avatar
      drm/i915: Report all objects with allocated pages to the shrinker · d82b4b26
      Chris Wilson authored
      Currently, we try to report to the shrinker the precise number of
      objects (pages) that are available to be reaped at this moment. This
      requires searching all objects with allocated pages to see if they
      fulfill the search criteria, and this count is performed quite
      frequently. (The shrinker tries to free ~128 pages on each invocation,
      before which we count all the objects; counting takes longer than
      unbinding the objects!) If we take the pragmatic view that with
      sufficient desire, all objects are eventually reapable (they become
      inactive, or no longer used as framebuffer etc), we can simply return
      the count of pinned pages maintained during get_pages/put_pages rather
      than walk the lists every time.
      
      The downside is that we may (slightly) over-report the number of
      objects/pages we could shrink and so penalize ourselves by shrinking
      more than required. This is mitigated by keeping the order in which we
      shrink objects such that we avoid penalizing active and frequently used
      objects, and if memory is so tight that we need to free them we would
      need to anyway.
      
      v2: Only expose shrinkable objects to the shrinker; a small reduction in
      not considering stolen and foreign objects.
      v3: Restore the tracking from a "backup" copy from before the gem/ split
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
      Cc: Matthew Auld <matthew.auld@intel.com>
      Reviewed-by: default avatarMatthew Auld <matthew.auld@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20190530203500.26272-2-chris@chris-wilson.co.uk
      d82b4b26