Messages in this thread Patch in this message | | | Date | Thu, 17 Sep 2009 22:10:43 GMT | From | "tip-bot for Paul E. McKenney" <> | Subject | [tip:core/urgent] rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down |
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Commit-ID: bbe3eae8bb039b5ffd64a6e3d1a0deaa1f3cbae9 Gitweb: http://git.kernel.org/tip/bbe3eae8bb039b5ffd64a6e3d1a0deaa1f3cbae9 Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> AuthorDate: Sun, 13 Sep 2009 09:15:08 -0700 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Fri, 18 Sep 2009 00:05:53 +0200
rcu: Kconfig help needs to say that TREE_PREEMPT_RCU scales down
To quote Valdis:
This leaves somebody who has a laptop wondering which choice is best for a system with only one or two cores that has CONFIG_PREEMPT defined. One choice says it scales down nicely, the other explicitly has a 'depends on PREEMPT' attached to it...
So add "scales down nicely" to TREE_PREEMPT_RCU to match that of TREE_RCU.
Suggested-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org LKML-Reference: <12528585112362-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
--- init/Kconfig | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig index 8e8b76d..4c2c936 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -331,7 +331,8 @@ config TREE_PREEMPT_RCU This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response - is also required. + is also required. It also scales down nicely to + smaller systems. endchoice
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