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| author |   Song Chen <chensong_2000@189.cn> | 2021-01-28 09:35:13 +0800 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-02-02 17:02:07 -0500 |
| commit | 4b9091e1c1948dea3b0b097496f308ede897d665 (patch) | |
| tree | c5ae6bb4b327cbd0eeaca47cb22c510846973840 /kernel/trace/Kconfig | |
| parent | tracepoint: Do not fail unregistering a probe due to memory failure (diff) | |
| download | linux-dev-4b9091e1c1948dea3b0b097496f308ede897d665.tar.xz linux-dev-4b9091e1c1948dea3b0b097496f308ede897d665.zip | |
kernel: trace: preemptirq_delay_test: add cpu affinity
The kernel thread executing test can run on any cpu, which might be
different cpu latency tracer is running on, as a result, the
big latency caused by preemptirq delay test can't be detected.
Therefore, the argument cpu_affinity is added to be passed to test,
ensure it's running on the same cpu with latency tracer.
e.g.
cyclictest -p 90 -m -c 0 -i 1000 -a 3
modprobe preemptirq_delay_test test_mode=preempt delay=500 \
burst_size=3 cpu_affinity=3
Link: https://lkml.kernel.org/r/1611797713-20965-1-git-send-email-chensong_2000@189.cn
Signed-off-by: Song Chen <chensong_2000@189.cn>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 4f976f8d9a38..799dbcfe65ad 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -886,6 +886,10 @@ config PREEMPTIRQ_DELAY_TEST irq-disabled critical sections for 500us: modprobe preemptirq_delay_test test_mode=irq delay=500 burst_size=3 + What's more, if you want to attach the test on the cpu which the latency + tracer is running on, specify cpu_affinity=cpu_num at the end of the + command. + If unsure, say N config SYNTH_EVENT_GEN_TEST |