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Message-ID: <CAJhHMCDw3oUF9TNPGFzkVNrq2X3XcdjqmS-O5pEQESb=83exAg@mail.gmail.com>
Date: Wed, 29 Oct 2014 13:52:03 -0400
From: Pranith Kumar <bobby.prani@...il.com>
To: Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Lai Jiangshan <laijs@...fujitsu.com>,
Dipankar Sarma <dipankar@...ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Josh Triplett <josh@...htriplett.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
David Howells <dhowells@...hat.com>,
Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com,
Frédéric Weisbecker <fweisbec@...il.com>,
Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH tip/core/rcu 0/9] Per-CPU-variable updates
On Tue, Oct 28, 2014 at 5:51 PM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> Hello!
>
> This series updates RCU's handling of per-CPU variables, mostly
> moving from "cpu" function arguments to various "this_"-style accessors
> for per-CPU variables:
>
> 1. Drop the rdtp argument from RCU's dyntick-idle and sysidle
> functions, substituting this_cpu_ptr(), courtesy of Christoph
> Lameter.
>
> 2. Use DEFINE_PER_CPU_SHARED_ALIGNED for rcu_data structures in
> order to avoid false sharing with other per-CPU variables.
>
> 3-9. Remove "cpu" arguments from a number of RCU functions that are
> only ever invoked on that CPU, and use appropriate "this_"-style
> accesssors for the per-CPU variables.
>
Reviewd-by: Pranith Kumar <bobby.prani@...il.com>
> Thanx, Paul
>
> ------------------------------------------------------------------------
>
> b/include/linux/rcupdate.h | 2 +-
> b/include/linux/rcutiny.h | 2 +-
> b/include/linux/rcutree.h | 4 ++--
> b/kernel/cpu.c | 19 +++++++++++++------
> b/kernel/rcu/tiny.c | 2 +-
> b/kernel/rcu/tree.c | 25 +++++++++++++------------
> b/kernel/rcu/tree.h | 4 ++--
> b/kernel/rcu/tree_plugin.h | 11 +++++++----
> b/kernel/sched/core.c | 2 +-
> b/kernel/softirq.c | 2 +-
> b/kernel/time/tick-sched.c | 2 +-
> b/kernel/time/timer.c | 3 +--
> include/linux/rcupdate.h | 2 +-
> include/linux/rcutree.h | 2 +-
> kernel/rcu/tree.c | 30 +++++++++++++++---------------
> kernel/rcu/tree.h | 8 ++++----
> kernel/rcu/tree_plugin.h | 42 +++++++++++++++++++++---------------------
> 17 files changed, 86 insertions(+), 76 deletions(-)
>
--
Pranith
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