[patch 1/4] Markers - depends on not PREEMPT_RCU

Mathieu Desnoyers
2008-03-20T00:41:50Z

[-- Attachment #1: markers-depends-on-not-preempt-rcu.patch --]
[-- Type: text/plain, Size: 1303 bytes --]

Markers do not mix well with CONFIG_PREEMPT_RCU because it uses
preempt_disable/enable() and not rcu_read_lock/unlock for minimal
intrusiveness. We would need call_sched and sched_barrier primitives.

This should be in for 2.6.25.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Christoph Hellwig <hch@infradead.org>
CC: Andrew Morton <akpm@osdl.org>
CC: Mike Mason <mmlnx@us.ibm.com>
CC: Dipankar Sarma <dipankar@in.ibm.com>
CC: David Smith <dsmith@redhat.com>
CC: "Paul E. McKenney" <paulmck@us.ibm.com>
CC: Steven Rostedt <rostedt@goodmis.org>
CC: Adrian Bunk <adrian.bunk@movial.fi>
---
init/Kconfig | 1 +
1 file changed, 1 insertion(+)

Index: linux-2.6-lttng/init/Kconfig
===================================================================
--- linux-2.6-lttng.orig/init/Kconfig 2008-03-19 18:26:47.000000000 -0400
+++ linux-2.6-lttng/init/Kconfig 2008-03-19 18:27:43.000000000 -0400
@@ -742,6 +742,7 @@ config PROFILING

config MARKERS
bool "Activate markers"
+ depends on !PREEMPT_RCU
help
Place an empty function call at each marker site. Can be
dynamically changed for a probe function.

--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68