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author | Zheng Yejian <zhengyejian1@huawei.com> | 2023-08-05 06:38:16 +0300 |
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committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-08-16 22:13:40 +0300 |
commit | 5450be6befc63670f2c05aa6773a8e437b39a3fe (patch) | |
tree | 2d4581b2ac4bd781ccb6f213e8b44e67975f0ae8 /tools/testing/selftests | |
parent | b71645d6af10196c46cbe3732de2ea7d36b3ff6d (diff) | |
download | linux-5450be6befc63670f2c05aa6773a8e437b39a3fe.tar.xz |
selftests/ftrace: Add a basic testcase for snapshot
This testcase is constrived to reproduce a problem that the cpu buffers
become unavailable which is due to 'record_disabled' of array_buffer and
max_buffer being messed up.
Local test result after bugfix:
# ./ftracetest test.d/00basic/snapshot1.tc
=== Ftrace unit tests ===
[1] Snapshot and tracing_cpumask [PASS]
[2] (instance) Snapshot and tracing_cpumask [PASS]
# of passed: 2
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
Link: https://lkml.kernel.org/r/20230805033816.3284594-3-zhengyejian1@huawei.com
Cc: <mhiramat@kernel.org>
Cc: <vnagarnaik@google.com>
Cc: <shuah@kernel.org>
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'tools/testing/selftests')
-rw-r--r-- | tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc b/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc new file mode 100644 index 000000000000..63b76cf2a360 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/00basic/snapshot1.tc @@ -0,0 +1,31 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Snapshot and tracing_cpumask +# requires: trace_marker tracing_cpumask snapshot +# flags: instance + +# This testcase is constrived to reproduce a problem that the cpu buffers +# become unavailable which is due to 'record_disabled' of array_buffer and +# max_buffer being messed up. + +# Store origin cpumask +ORIG_CPUMASK=`cat tracing_cpumask` + +# Stop tracing all cpu +echo 0 > tracing_cpumask + +# Take a snapshot of the main buffer +echo 1 > snapshot + +# Restore origin cpumask, note that there should be some cpus being traced +echo ${ORIG_CPUMASK} > tracing_cpumask + +# Set tracing on +echo 1 > tracing_on + +# Write a log into buffer +echo "test input 1" > trace_marker + +# Ensure the log writed so that cpu buffers are still available +grep -q "test input 1" trace +exit 0 |