linux-kernel - [RFC PATCH 0/5] Add kernel-offset file and make rcu_read

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Date:	Mon, 28 Mar 2011 10:55:41 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Jan Beulich <jbeulich@...ell.com>,
	David Howells <dhowells@...hat.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	Christoph Lameter <clameter@....com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: [RFC PATCH 0/5] Add kernel-offset file and make rcu_read_[un]lock()
 included



__rcu_read_[un]lock() are so simple functions and called so
frequent, it is not good that a function call overhead is
required when use them. It would be better if we declare
them inline and let the compiler do the choice.

We add kernel-offset.c for TASK_RCU_OFFSET, which enable we declare
rcu_read_[un]lock() as inline function.

Adding kernel-offset.c does not have any effect for the result
compiled kernel, it just adds a small and fast step in the kbuid stage.

Lai Jiangshan (5):
  task_rcu_struct
  kbuild_dedumplicated
  add_kernel_offset
  access task's task_rcu_struct without include sched.h
  rcu inline

 Kbuild                    |   99 ++++++++++++++++---------------
 include/linux/init_task.h |   25 +--------
 include/linux/rcupdate.h  |  144 ++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/sched.h     |   39 +------------
 kernel/kernel-offsets.c   |   17 +++++
 kernel/rcutiny_plugin.h   |   58 ++++--------------
 kernel/rcutree_plugin.h   |   69 ++++++----------------
 7 files changed, 243 insertions(+), 208 deletions(-)
 create mode 100644 kernel/kernel-offsets.c

-- 
1.7.4
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