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// linux source:
// drivers/cpufreq/cpufreq_stats.c >= v2.6.18
// https://elixir.bootlin.com/linux/v2.6.18/source/drivers/cpufreq/cpufreq_stats.c#L83
use crate::cpufreqs::TimeInState;
use crate::util::find_to_pos;
#[allow(unused_imports)]
use crate::util::find_to_opt;
#[derive(Debug, Default, Clone)]
pub struct CpuFreqMaxParser();
impl CpuFreqMaxParser {
pub fn parse(&mut self, sl: &[u8]) -> u32 {
// content of /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
// "2403000\n"
//
if sl.is_empty() {
return 0;
}
let s = &sl[0..sl.len() - 1];
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}
}
#[derive(Debug, Default, Clone)]
pub struct CpuFreqStatsTimeInStateParser();
impl CpuFreqStatsTimeInStateParser {
pub fn parse(&mut self, sl: &[u8]) -> Vec<TimeInState> {
let mut time_in_states = Vec::new();
if sl.is_empty() {
return time_in_states;
}
//
let mut pos1: usize = 0;
let mut pos2: usize;
let mut pos_end: usize;
let mut idx: usize = 0;
'tis_loop: loop {
if pos1 >= sl.len() {
break 'tis_loop;
}
//
let haystack = &sl[pos1..];
let needle = b"\n";
pos_end = pos1
+ 1
+ match find_to_opt(haystack, needle) {
Some(pos) => pos,
None => break 'tis_loop,
};
//
if idx >= time_in_states.len() {
time_in_states.resize(idx + 1, TimeInState::default());
}
let tis_ref: &mut TimeInState = match time_in_states.get_mut(idx) {
Some(tis) => tis,
None => unreachable!(),
};
//
// content of /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state
// "2403000 4202462\n"
// "2136000 2726644\n"
// on linux:
// "%u %llu\n"
//
macro_rules! myscan {
(check, $needle:expr) => {{
{
let haystack = &sl[pos1..pos_end];
let needle = $needle;
match find_to_opt(haystack, needle) {
Some(_pos) => true,
None => false,
}
}
}};
(skip, $needle:expr) => {{
pos2 = {
let haystack = &sl[pos1..pos_end];
let needle = $needle;
pos1 + find_to_pos(haystack, needle)
};
let s = &sl[pos1..pos2];
pos1 = pos2 + 1;
s
}};
($needle:expr) => {{
let s = myscan!(skip, $needle);
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}};
}
//
if myscan!(check, b" ") {
tis_ref.step = myscan!(b" ");
tis_ref.value = myscan!(b"\n");
} else {
return vec![];
}
let _ = pos1;
//
idx += 1;
pos1 = pos2 + 1;
}
time_in_states.resize(idx, TimeInState::default());
//
time_in_states
}
}