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authorPeter Zijlstra <peterz@infradead.org>2010-05-29 15:31:43 +0200
committerIngo Molnar <mingo@elte.hu>2010-07-05 14:43:50 +0200
commitb945d6b2554d550fe95caadc61e521c0ad71fb9c (patch)
tree0b76cdb978bead82188de40cae6d24bd88d71b7d /fs/hfs
parentd596043d71ff0d7b3d0bead19b1d68c55f003093 (diff)
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rbtree: Undo augmented trees performance damage and regression
Reimplement augmented RB-trees without sprinkling extra branches all over the RB-tree code (which lives in the scheduler hot path). This approach is 'borrowed' from Fabio's BFQ implementation and relies on traversing the rebalance path after the RB-tree-op to correct the heap property for insertion/removal and make up for the damage done by the tree rotations. For insertion the rebalance path is trivially that from the new node upwards to the root, for removal it is that from the deepest node in the path from the to be removed node that will still be around after the removal. [ This patch also fixes a video driver regression reported by Ali Gholami Rudi - the memtype->subtree_max_end was updated incorrectly. ] Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Venkatesh Pallipadi <venki@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Tested-by: Ali Gholami Rudi <ali@rudi.ir> Cc: Fabio Checconi <fabio@gandalf.sssup.it> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <1275414172.27810.27961.camel@twins> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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