Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'probes-fixes-6.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull probes fixes from Masami Hiramatsu:
- Return NULL if the trace_probe list on trace_probe_event is empty
- selftests/ftrace: Choose testing symbol name for filtering feature
from sample data instead of fixed symbol
* tag 'probes-fixes-6.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
selftests/ftrace: Choose target function for filter test from samples
tracing/probe: trace_probe_primary_from_call(): checked list_first_entry
+29
-20
+1
-1
kernel/trace/trace_probe.h
+1
-1
kernel/trace/trace_probe.h
···
308
308
{
309
309
struct trace_probe_event *tpe = trace_probe_event_from_call(call);
310
310
311
-
return list_first_entry(&tpe->probes, struct trace_probe, list);
311
+
return list_first_entry_or_null(&tpe->probes, struct trace_probe, list);
312
312
}
313
313
314
314
static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
+28
-19
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
+28
-19
tools/testing/selftests/ftrace/test.d/filter/event-filter-function.tc
···
9
9
exit_fail
10
10
}
11
11
12
-
echo "Test event filter function name"
12
+
sample_events() {
13
+
echo > trace
14
+
echo 1 > events/kmem/kmem_cache_free/enable
15
+
echo 1 > tracing_on
16
+
ls > /dev/null
17
+
echo 0 > tracing_on
18
+
echo 0 > events/kmem/kmem_cache_free/enable
19
+
}
20
+
13
21
echo 0 > tracing_on
14
22
echo 0 > events/enable
15
-
echo > trace
16
-
echo 'call_site.function == exit_mmap' > events/kmem/kmem_cache_free/filter
17
-
echo 1 > events/kmem/kmem_cache_free/enable
18
-
echo 1 > tracing_on
19
-
ls > /dev/null
20
-
echo 0 > events/kmem/kmem_cache_free/enable
21
23
22
-
hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`
23
-
misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`
24
+
echo "Get the most frequently calling function"
25
+
sample_events
26
+
27
+
target_func=`cut -d: -f3 trace | sed 's/call_site=\([^+]*\)+0x.*/\1/' | sort | uniq -c | sort | tail -n 1 | sed 's/^[ 0-9]*//'`
28
+
if [ -z "$target_func" ]; then
29
+
exit_fail
30
+
fi
31
+
echo > trace
32
+
33
+
echo "Test event filter function name"
34
+
echo "call_site.function == $target_func" > events/kmem/kmem_cache_free/filter
35
+
sample_events
36
+
37
+
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
38
+
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
24
39
25
40
if [ $hitcnt -eq 0 ]; then
26
41
exit_fail
···
45
30
exit_fail
46
31
fi
47
32
48
-
address=`grep ' exit_mmap$' /proc/kallsyms | cut -d' ' -f1`
33
+
address=`grep " ${target_func}\$" /proc/kallsyms | cut -d' ' -f1`
49
34
50
35
echo "Test event filter function address"
51
-
echo 0 > tracing_on
52
-
echo 0 > events/enable
53
-
echo > trace
54
36
echo "call_site.function == 0x$address" > events/kmem/kmem_cache_free/filter
55
-
echo 1 > events/kmem/kmem_cache_free/enable
56
-
echo 1 > tracing_on
57
-
sleep 1
58
-
echo 0 > events/kmem/kmem_cache_free/enable
37
+
sample_events
59
38
60
-
hitcnt=`grep kmem_cache_free trace| grep exit_mmap | wc -l`
61
-
misscnt=`grep kmem_cache_free trace| grep -v exit_mmap | wc -l`
39
+
hitcnt=`grep kmem_cache_free trace| grep $target_func | wc -l`
40
+
misscnt=`grep kmem_cache_free trace| grep -v $target_func | wc -l`
62
41
63
42
if [ $hitcnt -eq 0 ]; then
64
43
exit_fail