1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
use crate::cpuonline;
use crate::error::BccError;
use crate::perf_event::open_perf_buffer;
use crate::perf_event::perf_reader::PerfReader;
use crate::table::Table;
use bcc_sys::bccapi::perf_reader;
use bcc_sys::bccapi::perf_reader_poll;
use byteorder::NativeEndian;
use byteorder::WriteBytesExt;
use std::io::Cursor;
pub struct PerfMapBuilder<F: Fn() -> Box<dyn FnMut(&[u8]) + Send>> {
table: Table,
cb: F,
page_count: i32,
}
impl<F: Fn() -> Box<dyn FnMut(&[u8]) + Send>> PerfMapBuilder<F> {
pub fn new(table: Table, cb: F) -> Self {
Self {
table,
cb,
page_count: super::BPF_PERF_READER_PAGE_CNT,
}
}
pub fn page_count(mut self, page_count: i32) -> Self {
self.page_count = page_count;
self
}
pub fn build(mut self) -> Result<PerfMap, BccError> {
let key_size = self.table.key_size();
let leaf_size = self.table.leaf_size();
let leaf = vec![0; leaf_size];
if key_size != 4 || leaf_size != 4 {
return Err(BccError::TableInvalidSize);
}
let mut readers: Vec<PerfReader> = vec![];
let mut cur = Cursor::new(leaf);
let cpus = cpuonline::get()?;
for cpu in cpus.iter() {
let mut reader = open_perf_buffer(*cpu, (self.cb)(), self.page_count)?;
let perf_fd = reader.fd() as u32;
readers.push(reader);
let mut key = vec![];
key.write_u32::<NativeEndian>(*cpu as u32)?;
cur.write_u32::<NativeEndian>(perf_fd)?;
if self.table.set(&mut key, &mut cur.get_mut()).is_ok() {
cur.set_position(0);
} else {
return Err(BccError::InitializePerfMap);
}
}
Ok(PerfMap { readers })
}
}
#[allow(dead_code)]
pub struct PerfMap {
pub(crate) readers: Vec<PerfReader>,
}
#[deprecated(
since = "0.0.30",
note = "Please use PerfMapBuilder to create a new PerfMap instead"
)]
pub fn init_perf_map<F>(table: Table, cb: F) -> Result<PerfMap, BccError>
where
F: Fn() -> Box<dyn FnMut(&[u8]) + Send>,
{
PerfMapBuilder::new(table, cb).build()
}
impl PerfMap {
pub fn poll(&mut self, timeout: i32) {
unsafe {
perf_reader_poll(
self.readers.len() as i32,
self.readers.as_ptr() as *mut *mut perf_reader,
timeout,
)
};
}
}