selftests/ftrace: Add snapshot and tracing_on test case
[ Upstream commit 82f4f3e69c
]
Add a testcase for checking snapshot and tracing_on
relationship. This ensures that the snapshotting doesn't
affect current tracing on/off settings.
Link: http://lkml.kernel.org/r/153149932412.11274.15289227592627901488.stgit@devbox
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Hiraku Toyooka <hiraku.toyooka@cybertrust.co.jp>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
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2c69b03004
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#!/bin/sh
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# description: Snapshot and tracing setting
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# flags: instance
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[ ! -f snapshot ] && exit_unsupported
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echo "Set tracing off"
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echo 0 > tracing_on
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echo "Allocate and take a snapshot"
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echo 1 > snapshot
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# Since trace buffer is empty, snapshot is also empty, but allocated
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grep -q "Snapshot is allocated" snapshot
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echo "Ensure keep tracing off"
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test `cat tracing_on` -eq 0
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echo "Set tracing on"
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echo 1 > tracing_on
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echo "Take a snapshot again"
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echo 1 > snapshot
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echo "Ensure keep tracing on"
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test `cat tracing_on` -eq 1
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exit 0
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