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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2017-05-23 09:04:46 +0300 |
|---|---|---|
| committer | Shuah Khan <shuahkh@osg.samsung.com> | 2017-06-07 19:07:22 +0300 |
| commit | 1d0864db8f3af3978d7b5207f9165fbe2a37148c (patch) | |
| tree | f61e94115e161e8eb615f5e0287aa93e2389abb1 /tools/testing | |
| parent | 27af344ba09c552d6ee9f1ef05bc00dc676fb0e8 (diff) | |
| download | linux-1d0864db8f3af3978d7b5207f9165fbe2a37148c.tar.xz | |
selftests/ftrace: Reduce trace buffer checking overhead
Current event/toplevel-enable.tc checking the trace
buffer by dumping all events while recording events.
However, this makes system very busy.
To reduce this overhead comes from reading trace buffer
and recording trace buffer, use head instead of cat
and stop tracing while reading.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc index 0bb5df3c00d4..15e2d3fe1731 100644 --- a/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc +++ b/tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc @@ -28,7 +28,9 @@ echo '*:*' > set_event yield -count=`cat trace | grep -v ^# | wc -l` +echo 0 > tracing_on + +count=`head -n 128 trace | grep -v ^# | wc -l` if [ $count -eq 0 ]; then fail "none of events are recorded" fi @@ -36,10 +38,12 @@ fi do_reset echo 1 > events/enable +echo 1 > tracing_on yield -count=`cat trace | grep -v ^# | wc -l` +echo 0 > tracing_on +count=`head -n 128 trace | grep -v ^# | wc -l` if [ $count -eq 0 ]; then fail "none of events are recorded" fi |