perf test: Update sample filtering tests with multiple events

Add Multiple bpf-filter test for two or more events with filters.
It uses task-clock and page-faults events with different filter
expressions and check the perf script output

$ sudo ./perf test filtering -vv
96: perf record sample filtering (by BPF) tests:
--- start ---
test child forked, pid 2804025
Checking BPF-filter privilege
Basic bpf-filter test
Basic bpf-filter test [Success]
Failing bpf-filter test
Error: task-clock event does not have PERF_SAMPLE_CPU
Failing bpf-filter test [Success]
Group bpf-filter test
Error: task-clock event does not have PERF_SAMPLE_CPU
Error: task-clock event does not have PERF_SAMPLE_CODE_PAGE_SIZE
Group bpf-filter test [Success]
Multiple bpf-filter test
Multiple bpf-filter test [Success]
---- end(0) ----
96: perf record sample filtering (by BPF) tests : Ok

Signed-off-by: Namhyung Kim <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: KP Singh <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Song Liu <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/record_bpf_filter.sh

···
   echo "Group bpf-filter test [Success]"
 }
 
+test_bpf_filter_multi() {
+  echo "Multiple bpf-filter test"
+
+  if ! perf record -e task-clock --filter 'period > 100000' \
+       -e page-faults --filter 'ip < 0xffffffff00000000' \
+       -o "${perfdata}" true 2> /dev/null
+  then
+    echo "Multiple bpf-filter test [Failed record]"
+    err=1
+    return
+  fi
+
+  if ! perf script -i "${perfdata}" -F period,event | grep task-clock | \
+	  awk '{ if (int($1) <= 100000) { print $0; exit(1); } }'
+  then
+    echo "Multiple bpf-filter test [Failed task-clock period]"
+    err=1
+    return
+  fi
+
+  if perf script -i "${perfdata}" -F event,ip | grep page-fault | \
+	  grep 'ffffffff[0-9a-f]*'
+  then
+    echo "Multiple bpf-filter test [Failed page-faults ip]"
+    err=1
+    return
+  fi
+
+  echo "Multiple bpf-filter test [Success]"
+}
 
 test_bpf_filter_priv
 
···
 
 if [ $err = 0 ]; then
   test_bpf_filter_group
+fi
+
+if [ $err = 0 ]; then
+  test_bpf_filter_multi
 fi
 
 cleanup