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authorKalesh Singh <kaleshsingh@google.com>2021-10-29 21:33:30 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-11-02 03:47:00 +0300
commit4e9f63c9e5c2597692567ee1cb0851a21104a531 (patch)
tree8f3c53fe73da9a67921ac4daefd90ef78c25a81b /tools/testing
parent6a6e5ef2b27f45c15cca569a0825dfd75f564c35 (diff)
downloadlinux-4e9f63c9e5c2597692567ee1cb0851a21104a531.tar.xz
tracing/selftests: Add tests for hist trigger expression parsing
Add tests for the parsing of hist trigger expressions; and to validate expression evaluation. Link: https://lkml.kernel.org/r/20211029183339.3216491-5-kaleshsingh@google.com Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc63
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc
new file mode 100644
index 000000000000..05ffba299dbf
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc
@@ -0,0 +1,63 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: event trigger - test histogram expression parsing
+# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist error_log "<var1>=<field|var_ref|numeric_literal>":README
+
+
+fail() { #msg
+ echo $1
+ exit_fail
+}
+
+test_hist_expr() { # test_name expression expected_val
+ trigger="events/sched/sched_process_fork/trigger"
+
+ reset_trigger_file $trigger
+
+ echo "Test hist trigger expressions - $1"
+
+ echo "hist:keys=common_pid:x=$2" > $trigger
+
+ for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+
+ actual=`grep -o 'x=[[:digit:]]*' $trigger | awk -F= '{ print $2 }'`
+
+ if [ $actual != $3 ]; then
+ fail "Failed hist trigger expression evaluation: Expression: $2 Expected: $3, Actual: $actual"
+ fi
+
+ reset_trigger_file $trigger
+}
+
+check_error() { # test_name command-with-error-pos-by-^
+ trigger="events/sched/sched_process_fork/trigger"
+
+ echo "Test hist trigger expressions - $1"
+ ftrace_errlog_check 'hist:sched:sched_process_fork' "$2" $trigger
+}
+
+test_hist_expr "Variable assignment" "123" "123"
+
+test_hist_expr "Subtraction not associative" "16-8-4-2" "2"
+
+test_hist_expr "Division not associative" "64/8/4/2" "1"
+
+test_hist_expr "Same precedence operators (+,-) evaluated left to right" "16-8+4+2" "14"
+
+test_hist_expr "Same precedence operators (*,/) evaluated left to right" "4*3/2*2" "12"
+
+test_hist_expr "Multiplication evaluated before addition/subtraction" "4+3*2-2" "8"
+
+test_hist_expr "Division evaluated before addition/subtraction" "4+6/2-2" "5"
+
+# err pos for "too many subexpressions" is dependent on where
+# the last subexpression was detected. This can vary depending
+# on how the expression tree was generated.
+check_error "Too many subexpressions" 'hist:keys=common_pid:x=32+^10*3/20-4'
+check_error "Too many subexpressions" 'hist:keys=common_pid:x=^1+2+3+4+5'
+
+check_error "Unary minus not supported in subexpression" 'hist:keys=common_pid:x=-(^1)+2'
+
+check_error "Division by zero" 'hist:keys=common_pid:x=3/^0'
+
+exit 0