1 files changed, 30 insertions, 0 deletions

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8639819f6cef..d4409356f40d 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -535,6 +535,36 @@ config MMIOTRACE_TEST
 
           Say N, unless you absolutely know what you are doing.
 
+config TRACEPOINT_BENCHMARK
+        bool "Add tracepoint that benchmarks tracepoints"
+        help
+         This option creates the tracepoint "benchmark:benchmark_event".
+         When the tracepoint is enabled, it kicks off a kernel thread that
+         goes into an infinite loop (calling cond_sched() to let other tasks
+         run), and calls the tracepoint. Each iteration will record the time
+         it took to write to the tracepoint and the next iteration that
+         data will be passed to the tracepoint itself. That is, the tracepoint
+         will report the time it took to do the previous tracepoint.
+         The string written to the tracepoint is a static string of 128 bytes
+         to keep the time the same. The initial string is simply a write of
+         "START". The second string records the cold cache time of the first
+         write which is not added to the rest of the calculations.
+
+         As it is a tight loop, it benchmarks as hot cache. That's fine because
+         we care most about hot paths that are probably in cache already.
+
+         An example of the output:
+
+              START
+              first=3672 [COLD CACHED]
+              last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712
+              last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337
+              last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064
+              last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411
+              last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389
+              last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666
+
+
 config RING_BUFFER_BENCHMARK
         tristate "Ring buffer benchmark stress tester"
         depends on RING_BUFFER