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Subject[PATCH] kselftests/ftrace: Add a test for log2 modifier of hist trigger
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Add a test for log2 modifier of hist trigger in hist_mod.tc.
Here is the test result.

----
# ./ftracetest test.d/trigger/trigger-hist-mod.tc
=== Ftrace unit tests ===
[1] event trigger - test histogram modifiers [PASS]

# of passed: 1
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
---

Hi Tom, here is the patch to add a test for log2 modifier on your branch.

Thanks,
---
.../ftrace/test.d/trigger/trigger-hist-mod.tc | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
index 57e350a..c2b61c4 100644
--- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
@@ -60,6 +60,16 @@ for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
grep "id: sys_" events/raw_syscalls/sys_exit/hist > /dev/null || \
fail "syscall modifier on raw_syscalls/sys_exit did not work"

+
+reset_trigger
+
+echo "Test histgram with log2 modifier"
+
+echo 'hist:keys=bytes_req.log2' > events/kmem/kmalloc/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep 'bytes_req: ~ 2^[0-9]*' events/kmem/kmalloc/hist > /dev/null || \
+ fail "log2 modifier on kmem/kmalloc did not work"
+
do_reset

exit 0

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