From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: anton@samba.org, mingo@elte.hu, akpm@linux-foundation.org,
dipankar@in.ibm.com, manfred@colorfullife.com,
cl@linux-foundation.org, josht@linux.vnet.ibm.com,
schamp@sgi.com, niv@us.ibm.com, dvhltc@us.ibm.com,
ego@in.ibm.com, laijs@cn.fujitsu.com, rostedt@goodmis.org,
peterz@infradead.org, penberg@cs.helsinki.fi,
andi@firstfloor.org, tglx@linutronix.de,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing
Date: Mon, 13 Apr 2009 21:31:15 -0700 [thread overview]
Message-ID: <1239683478419-git-send-email-> (raw)
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>
---
next reply other threads:[~2009-04-14 5:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-14 4:31 Paul E. McKenney [this message]
2009-04-14 4:31 ` [PATCH 1/3] v2 Make hierarchical RCU less IPI-happy Paul E. McKenney
2009-04-14 10:00 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-04-14 4:31 ` [PATCH 2/3] v2 Add __rcu_pending tracing to hierarchical RCU Paul E. McKenney
2009-04-14 10:00 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-04-14 4:31 ` [PATCH 3/3] v2 Update RCU tracing documentation for __rcu_pending Paul E. McKenney
2009-04-14 10:01 ` [tip:core/rcu] rcu: " tip-bot for Paul E. McKenney
2009-04-14 9:34 ` [PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing Ingo Molnar
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