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* rcu: Fix rcu_barrier() documentationPaul E. McKenney2013-08-181-4/+8
| | | | | | | | | | | | | | | | | There was a time when rcu_barrier() was guaranteed to wait for at least a grace period, but that time ended due to energy-efficiency concerns. So now rcu_barrier() is a no-op if there are no RCU callbacks queued in the system. This commit updates the documentation to reflect this change. Now, rcu_barrier() often does wait for a grace period, so, one could imagine some modification to rcu_barrier() to more efficiently handle cases where both rcu_barrier() and a grace period are needed. But this must wait until someone shows a real-world need for a change. Reported-by: Bob Copeland <bob@cozybit.com> Reported-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
* rcu: Documentation updatePaul E. McKenney2013-03-121-1/+14
| | | | | | | This commit applies a few updates based on a quick review of the RCU documentations. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Update documentation to cover call_srcu() and srcu_barrier().Paul E. McKenney2012-07-021-11/+4
| | | | | | | The advent of call_srcu() and srcu_barrier() obsoleted some of the documentation, so this commit brings that up to date. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
* rcu: Add synchronize_sched_expedited() rcutorture doc + updatesPaul E. McKenney2009-07-031-0/+7
| | | | | | | | | | | | | | | | | | | | | | This patch updates the rcutorture documentation to include updated output format. It also brings the RCU documentation up to date. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org Cc: davem@davemloft.net Cc: dada1@cosmosbay.com Cc: zbr@ioremap.net Cc: jeff.chua.linux@gmail.com Cc: paulus@samba.org Cc: laijs@cn.fujitsu.com Cc: jengelh@medozas.de Cc: r000n@r000n.net Cc: benh@kernel.crashing.org Cc: mathieu.desnoyers@polymtl.ca LKML-Reference: <12459460983193-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* Document RCU and unloadable modulesPaul E. McKenney2008-12-031-0/+304
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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