From: Steven Rostedt As perf uses the rcu_read_lock() primitives for recording into its ring buffer, perf tracing can not be called when RCU in inactive. With the perf function tracing, there are functions that can be traced when RCU is not active, and perf must not have its function callback called when this is the case. Luckily, Paul McKenney has created a way to detect when RCU is active or not with the rcu_is_watching() function. Unfortunately, this function can also be traced, and if that happens it can cause a bit of overhead for the perf function calls that do the check. Recursion protection prevents anything bad from happening, but there is a bit of added overhead for every function being traced that must detect that the rcu_is_watching() is also being traced. As rcu_is_watching() is a helper routine and not part of the critical logic in RCU, it does not need to be traced in order to debug RCU itself. Add the "notrace" annotation to all the rcu_is_watching() calls such that we never trace it. Link: http://lkml.kernel.org/r/20131104202736.72dd8e45@gandalf.local.home Acked-by: Paul E. McKenney Signed-off-by: Steven Rostedt --- kernel/rcutiny.c | 2 +- kernel/rcutree.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c index 0fa061d..590c8a8 100644 --- a/kernel/rcutiny.c +++ b/kernel/rcutiny.c @@ -179,7 +179,7 @@ EXPORT_SYMBOL_GPL(rcu_irq_enter); /* * Test whether RCU thinks that the current CPU is idle. */ -bool __rcu_is_watching(void) +bool notrace __rcu_is_watching(void) { return rcu_dynticks_nesting; } diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 981d0c1..499bb2b 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -662,7 +662,7 @@ void rcu_nmi_exit(void) * rcu_is_watching(), the caller of __rcu_is_watching() must have at * least disabled preemption. */ -bool __rcu_is_watching(void) +bool notrace __rcu_is_watching(void) { return atomic_read(this_cpu_ptr(&rcu_dynticks.dynticks)) & 0x1; } @@ -673,7 +673,7 @@ bool __rcu_is_watching(void) * If the current CPU is in its idle loop and is neither in an interrupt * or NMI handler, return true. */ -bool rcu_is_watching(void) +bool notrace rcu_is_watching(void) { int ret; -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/