| #!/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 |
