Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tracing: selftests: Extend hotplug testing for trace remotes
The hotplug testing only tries reading a trace remote buffer, loaded
before a CPU is offline. Extend this testing to cover:
* A trace remote buffer loaded after a CPU is offline.
* A trace remote buffer loaded before a CPU is online.
Because of these added test cases, move the hotplug testing into a
separate hotplug.tc file.
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260401045100.3394299-3-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
authored by
Vincent Donnefort
and committed by
Marc Zyngier
ec07906b
ce47b798
+115
-55
+15
-4
tools/testing/selftests/ftrace/test.d/remotes/functions
+15
-4
tools/testing/selftests/ftrace/test.d/remotes/functions
···
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assert_loaded()
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{
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grep -q "(loaded)" buffer_size_kb
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grep -q "(loaded)" buffer_size_kb || return 1
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}
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assert_unloaded()
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{
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grep -q "(unloaded)" buffer_size_kb
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grep -q "(unloaded)" buffer_size_kb || return 1
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}
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+
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reload_remote()
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{
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echo 0 > tracing_on
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clear_trace
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assert_unloaded
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echo 1 > tracing_on
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assert_loaded
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}
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dump_trace_pipe()
···
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sed -n 's/^processor\s*:\s*\([0-9]\+\).*/\1/p' /proc/cpuinfo
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}
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-
get_page_size() {
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get_page_size()
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{
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sed -ne 's/^.*data.*size:\([0-9][0-9]*\).*/\1/p' events/header_page
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}
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get_selftest_event_size() {
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get_selftest_event_size()
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{
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sed -ne 's/^.*field:.*;.*size:\([0-9][0-9]*\);.*/\1/p' events/*/selftest/format | awk '{s+=$1} END {print s}'
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}
+88
tools/testing/selftests/ftrace/test.d/remotes/hotplug.tc
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tools/testing/selftests/ftrace/test.d/remotes/hotplug.tc
···
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Test trace remote read with an offline CPU
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# requires: remotes/test
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. $TEST_DIR/remotes/functions
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hotunplug_one_cpu()
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{
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[ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 1
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+
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for cpu in $(get_cpu_ids); do
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echo 0 > /sys/devices/system/cpu/cpu$cpu/online || return 1
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break
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done
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echo $cpu
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}
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+
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# Check non-consuming and consuming read
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check_read()
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{
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for i in $(seq 1 8); do
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echo $i > write_event
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done
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+
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check_trace 1 8 trace
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output=$(dump_trace_pipe)
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check_trace 1 8 $output
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rm $output
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}
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+
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test_hotplug()
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{
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echo 0 > trace
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assert_loaded
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+
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#
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# Test a trace buffer containing an offline CPU
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#
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+
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cpu=$(hotunplug_one_cpu) || exit_unsupported
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trap "echo 1 > /sys/devices/system/cpu/cpu$cpu/online" EXIT
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+
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check_read
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+
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#
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# Test a trace buffer with a missing CPU
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#
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reload_remote
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check_read
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#
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# Test a trace buffer with a CPU added later
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#
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echo 1 > /sys/devices/system/cpu/cpu$cpu/online
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trap "" EXIT
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assert_loaded
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check_read
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# Test if the ring-buffer for the newly added CPU is both writable and
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# readable
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for i in $(seq 1 8); do
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taskset -c $cpu echo $i > write_event
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done
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cd per_cpu/cpu$cpu/
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check_trace 1 8 trace
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output=$(dump_trace_pipe)
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check_trace 1 8 $output
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rm $output
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cd -
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}
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if [ -z "$SOURCE_REMOTE_TEST" ]; then
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set -e
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setup_remote_test
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test_hotplug
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fi
+11
tools/testing/selftests/ftrace/test.d/remotes/hypervisor/hotplug.tc
+11
tools/testing/selftests/ftrace/test.d/remotes/hypervisor/hotplug.tc
+1
-26
tools/testing/selftests/ftrace/test.d/remotes/trace.tc
+1
-26
tools/testing/selftests/ftrace/test.d/remotes/trace.tc
···
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#
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# Ensure the writer is not on the reader page by reloading the buffer
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echo 0 > tracing_on
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echo 0 > trace
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assert_unloaded
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echo 1 > tracing_on
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assert_loaded
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reload_remote
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# Ensure ring-buffer overflow by emitting events from the same CPU
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for cpu in $(get_cpu_ids); do
···
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cd - > /dev/null
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done
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-
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#
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# Test with hotplug
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#
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[ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 0
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echo 0 > trace
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for cpu in $(get_cpu_ids); do
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echo 0 > /sys/devices/system/cpu/cpu$cpu/online || return 0
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break
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done
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for i in $(seq 1 8); do
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echo $i > write_event
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done
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check_trace 1 8 trace
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echo 1 > /sys/devices/system/cpu/cpu$cpu/online
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}
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if [ -z "$SOURCE_REMOTE_TEST" ]; then
-25
tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc
-25
tools/testing/selftests/ftrace/test.d/remotes/trace_pipe.tc
···
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rm $output
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cd - > /dev/null
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done
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-
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#
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# Test interaction with hotplug
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#
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[ "$(get_cpu_ids | wc -l)" -ge 2 ] || return 0
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echo 0 > trace
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for cpu in $(get_cpu_ids); do
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echo 0 > /sys/devices/system/cpu/cpu$cpu/online || return 0
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break
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done
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for i in $(seq 1 8); do
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echo $i > write_event
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done
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output=$(dump_trace_pipe)
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check_trace 1 8 $output
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rm $output
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echo 1 > /sys/devices/system/cpu/cpu$cpu/online
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}
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if [ -z "$SOURCE_REMOTE_TEST" ]; then