Messages in this thread |  | | Date | Thu, 2 Feb 2012 17:12:08 -0800 | From | "Paul E. McKenney" <> | Subject | [PATCH RFC 0/3] Fix cpuidle_idle_call() RCU usage |
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Hello!
This patch series is a second attempt to fix the idle-loop uses of RCU, see https://lkml.org/lkml/2012/2/1/741 for v1. Where the first series attempted to drive rcu_idle_enter() and rcu_idle_exit() further down into the Linux kernels multitude of idle loops, this patch instead marks specific idle-loop operations containing RCU read-side critical sections, as suggested by Nicolas Pitre and Steven Rostedt. The possibility of code shared between idle and non-idle also requires the ability to nest rcu_idle_enter() calls. The individual patches are as follows:
1. Allow nesting of rcu_idle_enter() and rcu_idle_exit(). 2. Add an RCU_NONIDLE() macro to enclose idle-loop code that contains RCU read-side critical sections. 3. Use RCU_NONIDLE() to protect cpuidle_idle_call()'s tracepoints.
This patchset has the distinct advantage of avoiding touching any architecture-specific code. ;-)
Thanx, Paul
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b/drivers/cpuidle/cpuidle.c | 12 ++++++++---- b/include/linux/rcupdate.h | 27 +++++++++++++++++++++++++++ b/kernel/rcu.h | 18 +++++++++++++++++- b/kernel/rcutiny.c | 16 ++++++++++++---- b/kernel/rcutree.c | 19 +++++++++++++------ kernel/rcutiny.c | 2 ++ kernel/rcutree.c | 2 ++ 7 files changed, 81 insertions(+), 15 deletions(-)
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