diff options
135 files changed, 3008 insertions, 1525 deletions
diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst index 533415644c54..66ec972dfb78 100644 --- a/Documentation/trace/histogram.rst +++ b/Documentation/trace/histogram.rst @@ -1763,6 +1763,20 @@ using the same key and variable from yet another event:: # echo 'hist:key=pid:wakeupswitch_lat=$wakeup_lat+$switchtime_lat ...' >> event3/trigger +Expressions support the use of addition, subtraction, multiplication and +division operators (+-\*/). + +Note that division by zero always returns -1. + +Numeric constants can also be used directly in an expression:: + + # echo 'hist:keys=next_pid:timestamp_secs=common_timestamp/1000000 ...' >> event/trigger + +or assigned to a variable and referenced in a subsequent expression:: + + # echo 'hist:keys=next_pid:us_per_sec=1000000 ...' >> event/trigger + # echo 'hist:keys=next_pid:timestamp_secs=common_timestamp/$us_per_sec ...' >> event/trigger + 2.2.2 Synthetic Events ---------------------- diff --git a/Documentation/trace/kprobes.rst b/Documentation/trace/kprobes.rst index 998149ce2fd9..f318bceda1e6 100644 --- a/Documentation/trace/kprobes.rst +++ b/Documentation/trace/kprobes.rst @@ -784,6 +784,6 @@ References For additional information on Kprobes, refer to the following URLs: -- https://www.ibm.com/developerworks/library/l-kprobes/index.html +- https://lwn.net/Articles/132196/ - https://www.kernel.org/doc/ols/2006/ols2006v2-pages-109-124.pdf diff --git a/Documentation/trace/timerlat-tracer.rst b/Documentation/trace/timerlat-tracer.rst index c7cbb557aee7..64d1fe6e9b93 100644 --- a/Documentation/trace/timerlat-tracer.rst +++ b/Documentation/trace/timerlat-tracer.rst @@ -3,7 +3,7 @@ Timerlat tracer ############### The timerlat tracer aims to help the preemptive kernel developers to -find souces of wakeup latencies of real-time threads. Like cyclictest, +find sources of wakeup latencies of real-time threads. Like cyclictest, the tracer sets a periodic timer th |