Revision - 7acf3a1 - tracing: Ensure trace buffer is at least 4096 bytes large - origin: https://github.com/torvalds/linux

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05 April 2024, 19:05:47 UTC

Revision 7acf3a127bb7c65ff39099afd78960e77b2ca5de authored by Sven Schnelle on 14 February 2022, 13:44:56 UTC, committed by Steven Rostedt (Google) on 25 February 2022, 17:07:01 UTC

tracing: Ensure trace buffer is at least 4096 bytes large

Booting the kernel with 'trace_buf_size=1' give a warning at
boot during the ftrace selftests:

[    0.892809] Running postponed tracer tests:
[    0.892893] Testing tracer function:
[    0.901899] Callback from call_rcu_tasks_trace() invoked.
[    0.983829] Callback from call_rcu_tasks_rude() invoked.
[    1.072003] .. bad ring buffer .. corrupted trace buffer ..
[    1.091944] Callback from call_rcu_tasks() invoked.
[    1.097695] PASSED
[    1.097701] Testing dynamic ftrace: .. filter failed count=0 ..FAILED!
[    1.353474] ------------[ cut here ]------------
[    1.353478] WARNING: CPU: 0 PID: 1 at kernel/trace/trace.c:1951 run_tracer_selftest+0x13c/0x1b0

Therefore enforce a minimum of 4096 bytes to make the selftest pass.

Link: https://lkml.kernel.org/r/20220214134456.1751749-1-svens@linux.ibm.com

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

1 parent bc82c38

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Tip revision: 7acf3a127bb7c65ff39099afd78960e77b2ca5de authored by Sven Schnelle on 14 February 2022, 13:44:56 UTC
tracing: Ensure trace buffer is at least 4096 bytes large

Tip revision: 7acf3a1

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tracing: Ensure trace buffer is at least 4096 bytes large

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