1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 # description: event trigger - test histogram expression parsing
4 # requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist error_log "<var1>=<field|var_ref|numeric_literal>":README
5
6
7 fail() { #msg
8 echo $1
9 exit_fail
10 }
11
12 test_hist_expr() { # test_name expression expected_val
13 trigger="events/sched/sched_process_fork/trigger"
14
15 reset_trigger_file $trigger
16
17 echo "Test hist trigger expressions - $1"
18
19 echo "hist:keys=common_pid:x=$2" > $trigger
20
21 for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
22
23 actual=`grep -o 'x=[[:digit:]]*' $trigger | awk -F= '{ print $2 }'`
24
25 if [ $actual != $3 ]; then
26 fail "Failed hist trigger expression evaluation: Expression: $2 Expected: $3, Actual: $actual"
27 fi
28
29 reset_trigger_file $trigger
30 }
31
32 check_error() { # test_name command-with-error-pos-by-^
33 trigger="events/sched/sched_process_fork/trigger"
34
35 echo "Test hist trigger expressions - $1"
36 ftrace_errlog_check 'hist:sched:sched_process_fork' "$2" $trigger
37 }
38
39 test_hist_expr "Variable assignment" "123" "123"
40
41 test_hist_expr "Subtraction not associative" "16-8-4-2" "2"
42
43 test_hist_expr "Division not associative" "64/8/4/2" "1"
44
45 test_hist_expr "Same precedence operators (+,-) evaluated left to right" "16-8+4+2" "14"
46
47 test_hist_expr "Same precedence operators (*,/) evaluated left to right" "4*3/2*2" "12"
48
49 test_hist_expr "Multiplication evaluated before addition/subtraction" "4+3*2-2" "8"
50
51 test_hist_expr "Division evaluated before addition/subtraction" "4+6/2-2" "5"
52
53 # err pos for "too many subexpressions" is dependent on where
54 # the last subexpression was detected. This can vary depending
55 # on how the expression tree was generated.
56 check_error "Too many subexpressions" 'hist:keys=common_pid:x=32+^10*3/20-4'
57 check_error "Too many subexpressions" 'hist:keys=common_pid:x=^1+2+3+4+5'
58
59 check_error "Unary minus not supported in subexpression" 'hist:keys=common_pid:x=-(^1)+2'
60
61 check_error "Division by zero" 'hist:keys=common_pid:x=3/^0'
62
63 exit 0
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