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authorChris Wilson <chris@chris-wilson.co.uk>2016-11-01 12:11:34 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2016-11-01 13:01:44 +0000
commit548625ee8fde571c32e7976879854410689c4a84 (patch)
treef11298515ad3856c48405452163adecd88fd17f5 /tools/perf/scripts/python/call-graph-from-postgresql.py
parentdb6c2b4151f2915fe1695cdcac43b32e73d1ad32 (diff)
drm/i915: Improve lockdep tracking for obj->mm.lock
The shrinker may appear to recurse into obj->mm.lock as the shrinker may be called from a direct reclaim path whilst handling get_pages. We filter out recursing on the same obj->mm.lock by inspecting obj->mm.pages, but we do want to take the lock on a second object in order to reap their pages. lockdep spots the recursion on the same lockclass and needs annotation to avoid a false positive. To keep the two paths distinct, create an enum to indicate which subclass of obj->mm.lock we are using. This removes the false positive and avoids masking real bugs. Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161101121134.27504-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
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