From: Peter Zijlstra <peterz@infradead.org>
To: paulmck@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
rostedt@goodmis.org, Valdis.Kletnieks@vt.edu,
dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com,
fweisbec@gmail.com, patches@linaro.org,
"Paul E. McKenney" <paul.mckenney@linaro.org>
Subject: Re: [PATCH RFC tip/core/rcu 3/4] rcu: Make RCU_FAST_NO_HZ account for pauses out of idle
Date: Thu, 26 Apr 2012 17:09:36 +0200 [thread overview]
Message-ID: <1335452976.13683.88.camel@twins> (raw)
In-Reply-To: <20120426144910.GC2407@linux.vnet.ibm.com>
On Thu, 2012-04-26 at 07:49 -0700, Paul E. McKenney wrote:
> > per_cpu(rcu_dyntick.first_pass, cpu) = 0;
> I must confess that I had no idea that you could say the above. I would
> have expected to have to say the following:
>
> per_cpu(rcu_dyntick, cpu).first_pass = 0;
They both work and are afaik identical. The first takes the per-cpu
address of rcu_dyntick and adds the offset of first_pass, then
transforms the per-cpu address to a linear address. The second
transforms the per-cpu address of rcu_dyntick, transforms it to a linear
address and then adds the offset of first_pass, IOW:
(&rcu_dyntick + offset) + per_cpu_offset ==
(&rcu_dyntick + per_cpu_offset) + offset
next prev parent reply other threads:[~2012-04-26 15:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-23 16:15 [PATCH RFC tip/core/rcu 0/4] Updates to RCU_FAST_NO_HZ Paul E. McKenney
2012-04-23 16:15 ` [PATCH RFC tip/core/rcu 1/4] rcu: Add RCU_FAST_NO_HZ tracing for idle exit Paul E. McKenney
2012-04-23 16:15 ` [PATCH RFC tip/core/rcu 2/4] rcu: Make RCU_FAST_NO_HZ use timer rather than hrtimer Paul E. McKenney
2012-04-23 16:16 ` [PATCH RFC tip/core/rcu 3/4] rcu: Make RCU_FAST_NO_HZ account for pauses out of idle Paul E. McKenney
2012-04-26 13:00 ` Peter Zijlstra
2012-04-26 14:49 ` Paul E. McKenney
2012-04-26 15:09 ` Peter Zijlstra [this message]
2012-04-23 16:16 ` [PATCH RFC tip/core/rcu 4/4] rcu: Ensure that RCU_FAST_NO_HZ timers expire on correct CPU Paul E. McKenney
2012-04-26 13:04 ` Peter Zijlstra
2012-04-26 15:54 ` Paul E. McKenney
2012-04-26 16:08 ` Steven Rostedt
2012-04-26 17:56 ` Paul E. McKenney
2012-04-26 18:10 ` [PATCH] timer: Fix mod_timer_pinned() header commen (was: [PATCH RFC tip/core/rcu 4/4] rcu: Ensure that RCU_FAST_NO_HZ timers expire on correct CPU) Steven Rostedt
2012-04-26 18:36 ` Paul E. McKenney
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