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[PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing

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From: Paul E. McKenney
Subject: [PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing
Date: Monday, April 13, 2009 - 9:31 pm

This three-patch set fixes a hierarchical-RCU performance bug located
by Anton Blanchard.  This bug affects certain high-end floating-point
computation-heavy workloads with closely spaced barrier-synchronized
iterations, where an interruption of any one CPU's processing during a
given iteration slows the system as a whole.  This bug manifests itself
as excessive resched IPIs, and is strictly a performance regression.
It does not affect correctness.

The first patch provides the fix for the problem, the second patch
adds the tracing, and the third patch adds the documentation for the
tracing.

Located-by: Anton Blanchard <anton@au1.ibm.com>
Tested-by: Anton Blanchard <anton@au1.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Messages in current thread:
[PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and ad ..., Paul E. McKenney, (Mon Apr 13, 9:31 pm)
[PATCH 2/3] v2 Add __rcu_pending tracing to hierarchical RCU, Paul E. McKenney, (Mon Apr 13, 9:31 pm)
[PATCH 3/3] v2 Update RCU tracing documentation for __rcu_ ..., Paul E. McKenney, (Mon Apr 13, 9:31 pm)
Re: [PATCH 0/3] v2 Make hierarchical RCU less IPI-happy an ..., Ingo Molnar, (Tue Apr 14, 2:34 am)
[tip:core/rcu] rcu: Add __rcu_pending tracing to hierarchi ..., tip-bot for Paul E. ..., (Tue Apr 14, 3:00 am)
[tip:core/rcu] rcu: Update RCU tracing documentation for _ ..., tip-bot for Paul E. ..., (Tue Apr 14, 3:01 am)