Disable /proc fd caching on Linux when querying processes

This query only happens once, so caching is not needed

Also update sysinfo version to fix a crash related to this.

3 files changed, 10 insertions, 3 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 51135de1..63df7763 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1053,9 +1053,9 @@ dependencies = [
 
 [[package]]
 name = "sysinfo"
-version = "0.22.3"
+version = "0.22.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b645b59c59114c25d3d554f781b0a1f1f01545d1d02f271bfb1c897bdfdfdcf3"
+checksum = "ccb37aa4af23791c584202d286ed9420e023e9d27e49d5a76215623f4bcc2502"
 dependencies = [
  "cfg-if 1.0.0",
  "core-foundation-sys",
diff --git a/Cargo.toml b/Cargo.toml
index cdcf455e..6f46bcf1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,7 +53,7 @@ default-features = false
 features = ["parsing", "assets", "yaml-load", "dump-load", "regex-onig"]
 
 [dependencies.sysinfo]
-version = "0.22.3"
+version = "0.22.4"
 # no default features to disable the use of threads
 default-features = false
 features = []
diff --git a/src/utils/process.rs b/src/utils/process.rs
index 68b57a6a..eac564e0 100644
--- a/src/utils/process.rs
+++ b/src/utils/process.rs
@@ -226,6 +226,13 @@ struct ProcInfo {
 }
 impl ProcInfo {
     fn new() -> Self {
+        // On Linux sysinfo optimizes for repeated process queries and keeps per-process
+        // /proc file descriptors open. This caching is not needed here, so
+        // set this to zero (this does nothing on other platforms).
+        // Also, there is currently a kernel bug which slows down syscalls when threads are
+        // involved (here: the ctrlc handler) and a lot of files are kept open.
+        sysinfo::set_open_files_limit(0);
+
         ProcInfo {
             info: sysinfo::System::new(),
         }