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8bd1369b4c
Here we add unit tests for the preemptoff and irqsoff tracer by using a kernel module introduced previously to trigger long preempt or irq disabled sections in the kernel. Link: http://lkml.kernel.org/r/20180711063540.91101-3-joel@joelfernandes.org Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
74 lines
1.6 KiB
Bash
74 lines
1.6 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: test for the preemptirqsoff tracer
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MOD=preemptirq_delay_test
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fail() {
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reset_tracer
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rmmod $MOD || true
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exit_fail
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}
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unsup() { #msg
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reset_tracer
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rmmod $MOD || true
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echo $1
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exit_unsupported
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}
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modprobe $MOD || unsup "$MOD module not available"
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rmmod $MOD
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grep -q "preemptoff" available_tracers || unsup "preemptoff tracer not enabled"
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grep -q "irqsoff" available_tracers || unsup "irqsoff tracer not enabled"
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reset_tracer
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# Simulate preemptoff section for half a second couple of times
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echo preemptoff > current_tracer
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sleep 1
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modprobe $MOD test_mode=preempt delay=500000 || fail
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rmmod $MOD || fail
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modprobe $MOD test_mode=preempt delay=500000 || fail
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rmmod $MOD || fail
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modprobe $MOD test_mode=preempt delay=500000 || fail
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rmmod $MOD || fail
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cat trace
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# Confirm which tracer
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grep -q "tracer: preemptoff" trace || fail
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# Check the end of the section
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egrep -q "5.....us : <stack trace>" trace || fail
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# Check for 500ms of latency
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egrep -q "latency: 5..... us" trace || fail
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reset_tracer
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# Simulate irqsoff section for half a second couple of times
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echo irqsoff > current_tracer
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sleep 1
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modprobe $MOD test_mode=irq delay=500000 || fail
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rmmod $MOD || fail
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modprobe $MOD test_mode=irq delay=500000 || fail
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rmmod $MOD || fail
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modprobe $MOD test_mode=irq delay=500000 || fail
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rmmod $MOD || fail
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cat trace
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# Confirm which tracer
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grep -q "tracer: irqsoff" trace || fail
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# Check the end of the section
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egrep -q "5.....us : <stack trace>" trace || fail
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# Check for 500ms of latency
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egrep -q "latency: 5..... us" trace || fail
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reset_tracer
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exit 0
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