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*: reduce sys_getdents syscall (tikv#7306)
Signed-off-by: Breezewish <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| // Copyright 2020 TiKV Project Authors. Licensed under Apache-2.0. | ||
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| pub fn monitor_memory() -> std::io::Result<()> { | ||
| Ok(()) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| // Copyright 2020 TiKV Project Authors. Licensed under Apache-2.0. | ||
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|
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| //! This module is a subset of rust-prometheus's process collector, without the fd collector | ||
| //! to avoid memory fragmentation issues when open fd is large. | ||
| use std::io::{Error, ErrorKind, Result}; | ||
|
|
||
| use libc; | ||
| use procinfo::pid as pid_info; | ||
|
|
||
| use prometheus::core::{Collector, Desc}; | ||
| use prometheus::{proto, Gauge, Opts}; | ||
|
|
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| /// Monitors memory of the current process. | ||
| pub fn monitor_memory() -> Result<()> { | ||
| let pid = unsafe { libc::getpid() }; | ||
| let tc = MemoryCollector::new(pid); | ||
| prometheus::register(Box::new(tc)).map_err(|e| Error::new(ErrorKind::Other, e.to_string())) | ||
| } | ||
|
|
||
| /// A collector to collect memory metrics. | ||
| pub struct MemoryCollector { | ||
| pid: libc::pid_t, | ||
| descs: Vec<Desc>, | ||
| vsize: Gauge, | ||
| rss: Gauge, | ||
| } | ||
|
|
||
| impl MemoryCollector { | ||
| pub fn new(pid: libc::pid_t) -> Self { | ||
| let mut descs = Vec::new(); | ||
|
|
||
| let vsize = Gauge::with_opts(Opts::new( | ||
| "process_virtual_memory_bytes", | ||
| "Virtual memory size in bytes.", | ||
| )) | ||
| .unwrap(); | ||
| descs.extend(vsize.desc().into_iter().cloned()); | ||
|
|
||
| let rss = Gauge::with_opts(Opts::new( | ||
| "process_resident_memory_bytes", | ||
| "Resident memory size in bytes.", | ||
| )) | ||
| .unwrap(); | ||
| descs.extend(rss.desc().into_iter().cloned()); | ||
|
|
||
| Self { | ||
| pid, | ||
| descs, | ||
| vsize, | ||
| rss, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Collector for MemoryCollector { | ||
| fn desc(&self) -> Vec<&Desc> { | ||
| self.descs.iter().collect() | ||
| } | ||
|
|
||
| fn collect(&self) -> Vec<proto::MetricFamily> { | ||
| if let Ok(statm) = pid_info::statm(self.pid) { | ||
| self.vsize.set(statm.size as f64 * *PAGESIZE); | ||
| self.rss.set(statm.resident as f64 * *PAGESIZE); | ||
| } | ||
|
|
||
| let mut mfs = Vec::with_capacity(2); | ||
| mfs.extend(self.vsize.collect()); | ||
| mfs.extend(self.rss.collect()); | ||
| mfs | ||
| } | ||
| } | ||
|
|
||
| lazy_static! { | ||
| static ref PAGESIZE: f64 = { unsafe { libc::sysconf(libc::_SC_PAGESIZE) as f64 } }; | ||
| } |
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