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    Subject[PATCH 21/25] selftests/ftrace: Add ringbuffer size changing testcase
    Date
    Add a testcase for changing ringbuffer size. This tests
    not only ringbuffer size but also tests the imbalance
    per-cpu buffer size change too.

    Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
    ---
    .../ftrace/test.d/00basic/ringbuffer_size.tc | 21 ++++++++++++++++++++
    1 file changed, 21 insertions(+)
    create mode 100644 tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc

    diff --git a/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
    new file mode 100644
    index 000000000000..9224f33b3194
    --- /dev/null
    +++ b/tools/testing/selftests/ftrace/test.d/00basic/ringbuffer_size.tc
    @@ -0,0 +1,21 @@
    +#!/bin/sh
    +# SPDX-License-Identifier: GPL-2.0
    +# description: Change the ringbuffer size
    +
    +rb_size_test() {
    +ORIG=`cat buffer_size_kb`
    +
    +expr $ORIG / 2 > buffer_size_kb
    +
    +expr $ORIG \* 2 > buffer_size_kb
    +
    +echo $ORIG > buffer_size_kb
    +}
    +
    +rb_size_test
    +
    +: "If per-cpu buffer is supported, imbalance it"
    +if [ -d per_cpu/cpu0 ]; then
    + cd per_cpu/cpu0
    + rb_size_test
    +fi
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