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| author | Steven Rostedt <rostedt@goodmis.org> | 2013-05-28 22:38:42 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-05-29 06:47:13 +0400 |
| commit | 12bcbe66d7b3cc9f9f86cd02f925666eaa3c2107 (patch) | |
| tree | 54e70e0f7450aedfee1418742758dc538d9649e5 /Documentation/rt-mutex.txt | |
| parent | 6721cb60022629ae76365551f05d9658b8d14c55 (diff) | |
| download | linux-12bcbe66d7b3cc9f9f86cd02f925666eaa3c2107.tar.xz | |
rcu: Add _notrace variation of rcu_dereference_raw() and hlist_for_each_entry_rcu()
As rcu_dereference_raw() under RCU debug config options can add quite a
bit of checks, and that tracing uses rcu_dereference_raw(), these checks
happen with the function tracer. The function tracer also happens to trace
these debug checks too. This added overhead can livelock the system.
Add a new interface to RCU for both rcu_dereference_raw_notrace() as well
as hlist_for_each_entry_rcu_notrace() as the hlist iterator uses the
rcu_dereference_raw() as well, and is used a bit with the function tracer.
Link: http://lkml.kernel.org/r/20130528184209.304356745@goodmis.org
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/rt-mutex.txt')
0 files changed, 0 insertions, 0 deletions