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Subject[PATCH 13/13] perf samples: Add syscall-count.c object
Date
Adding syscall-count.c sample, that generates
syscall entry calls, like:

$ perf bpf -c samples/syscall-counts.c
LLVM: dumping samples/syscall-counts.o

$ sudo perf bpf -e samples/syscall-counts.o -a
BEGIN
^CEND
comm value
firefox 182
Socket Thread 8
InotifyEventThr 26
xmonad-x86_64-l 405
perf 45122
VoiceProcessThr 12
JS Watchdog 14
Chrome_~dThread 657
Softwar~cThread 474
Gecko_IOThread 489
stalonetray 8
mutt 410
Xorg 956
xchat 37
nm-applet 14
xscreensaver 170
Timer 1205
NetworkManager 25
rtkit-daemon 4
webrtc_audio_mo 24
Web Content 6889
IPDL Background 474
JS Helper 221
gkrellm 434
xterm 528
InputThread 793

Link: http://lkml.kernel.org/n/tip-9jsy0nnm8khn6e60fmwn4ei7@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/samples/syscall-counts.c | 61 +++++++++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+)
create mode 100644 tools/perf/samples/syscall-counts.c

diff --git a/tools/perf/samples/syscall-counts.c b/tools/perf/samples/syscall-counts.c
new file mode 100644
index 000000000000..e6de6c9fdb85
--- /dev/null
+++ b/tools/perf/samples/syscall-counts.c
@@ -0,0 +1,61 @@
+#include <uapi/linux/bpf.h>
+#include <bpf-helpers.h>
+#include <bpf-userfuncs.h>
+
+#define TASK_COMM_LEN 16
+
+char _license[] SEC("license") = "GPL";
+int _version SEC("version") = LINUX_VERSION_CODE;
+
+struct key_t {
+ char comm[TASK_COMM_LEN];
+};
+
+struct bpf_map_def SEC("maps") counts_map = {
+ .type = BPF_MAP_TYPE_HASH,
+ .key_size = sizeof(struct key_t),
+ .value_size = sizeof(u64),
+ .max_entries = 100,
+};
+
+SEC("raw_syscalls:sys_enter")
+int func(void *ctx)
+{
+ u64 *val, one = 1;
+ struct key_t key;
+ char comm[TASK_COMM_LEN];
+
+ bpf_get_current_comm(&key.comm, sizeof(comm));
+
+ val = bpf_map_lookup_elem(&counts_map, &key);
+ if (val)
+ (*val)++;
+ else
+ bpf_map_update_elem(&counts_map, &key, &one, BPF_NOEXIST);
+
+ return 0;
+}
+
+int BEGIN(void)
+{
+ print("BEGIN\n");
+ return 0;
+}
+
+void END(void)
+{
+ struct key_t key = {}, next_key;
+ u64 value;
+ int i = 0;
+
+ print("END\n");
+ print("\n comm value\n");
+
+ while (bpfu_map_get_next_key(&counts_map, &key, &next_key) == 0) {
+ if (bpfu_map_lookup_elem(&counts_map, &next_key, &value))
+ continue;
+
+ print("%18s %16lu\n", next_key.comm, value);
+ key = next_key;
+ }
+}
--
2.13.6
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