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| author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2022-05-10 11:45:24 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-05-27 03:13:00 +0200 |
| commit | 4dd2aea24ed7613735664feadc9879d37f718c23 (patch) | |
| tree | 69acae3a0763f90848c337899bbc37fb2dd79bab /Documentation/trace | |
| parent | tracing/timerlat: Notify IRQ new max latency only if stop tracing is set (diff) | |
| download | linux-4dd2aea24ed7613735664feadc9879d37f718c23.tar.xz linux-4dd2aea24ed7613735664feadc9879d37f718c23.zip | |
tracing/timerlat: Print stacktrace in the IRQ handler if needed
If print_stack and stop_tracing_us are set, and stop_tracing_us is hit
with latency higher than or equal to print_stack, print the
stack at the IRQ handler as it is useful to define the root cause for
the IRQ latency.
Link: https://lkml.kernel.org/r/fd04530ce98ae9270e41bb124ee5bf67b05ecfed.1652175637.git.bristot@kernel.org
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/timerlat-tracer.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/trace/timerlat-tracer.rst b/Documentation/trace/timerlat-tracer.rst index 64d1fe6e9b93..d643c95c01eb 100644 --- a/Documentation/trace/timerlat-tracer.rst +++ b/Documentation/trace/timerlat-tracer.rst @@ -74,8 +74,9 @@ directory. The timerlat configs are: - stop_tracing_total_us: stop the system tracing if a timer latency at the *thread* context is higher than the configured value happens. Writing 0 disables this option. - - print_stack: save the stack of the IRQ occurrence, and print - it after the *thread context* event". + - print_stack: save the stack of the IRQ occurrence. The stack is printed + after the *thread context* event, or at the IRQ handler if *stop_tracing_us* + is hit. timerlat and osnoise ---------------------------- |