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1aff1903d0
The shrinker cannot touch objects used by the contexts (logical state and ring). Currently we mark those as "pin_global" to let the shrinker skip over them, however, if we remove them from the shrinker lists entirely, we don't event have to include them in our shrink accounting. By keeping the unshrinkable objects in our shrinker tracking, we report a large number of objects available to be shrunk, and leave the shrinker deeply unsatisfied when we fail to reclaim those. The shrinker will persist in trying to reclaim the unavailable objects, forcing the system into a livelock (not even hitting the dread oomkiller). v2: Extend unshrinkable protection for perma-pinned scratch and guc allocations (Tvrtko) v3: Notice that we should be pinned when marking unshrinkable and so the link cannot be empty; merge duplicate paths. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190802212137.22207-1-chris@chris-wilson.co.uk |
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