linux-kernel - [PATCH v16 23/23] kselftests/ftrace: Add a test for log2 modifier of hist trigger

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Date:	Thu,  3 Mar 2016 12:55:03 -0600
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	rostedt@...dmis.org
Cc:	masami.hiramatsu.pt@...achi.com, namhyung@...nel.org,
	josh@...htriplett.org, andi@...stfloor.org,
	mathieu.desnoyers@...icios.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Shuah Khan <shuahkh@....samsung.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH v16 23/23] kselftests/ftrace: Add a test for log2 modifier of hist trigger

From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

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@...achi.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Shuah Khan <shuahkh@....samsung.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Tom Zanussi <tom.zanussi@...ux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
---
 .../selftests/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
-- 
1.9.3