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Emit less update events for odd FS events (#39557)

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When running flycheck, I've noticed that scrolling starts to lag:


https://github.com/user-attachments/assets/b0bef0a3-ccbd-479d-a385-273398086d38

When checking the trace, it is notable that project panel updates its
entire tree multiple times during flycheck:

<img width="2032" height="1136" alt="image"
src="https://github.com/user-attachments/assets/d1935e77-3b00-4be5-a12a-8a17a9d64202"
/>


[scrolling.trace.zip](https://github.com/user-attachments/files/22710852/scrolling.trace.zip)

Turns out, `target/debug` directory is loaded by Zed (presumably,
reported by langserver as there are sources generated by bindgen and
proto that need to be loaded), and `target/debug/build` directory
received multiple events of a `None` kind for Zed, which trigger the
rescans.

Rework the logic to omit the `None`-kind events in Zed, and to avoid
excessive repo updates if not needed.


Release Notes:

- Improved worktree FS event emits in gitignored directories

---------

Co-authored-by: Cole Miller <cole@zed.dev>
This commit is contained in:
Kirill Bulatov
2025-10-05 17:34:55 +00:00
committed by GitHub
co-authored by Cole Miller
parent 46b6adadf9
commit 469ecfbe13
4 changed files with 338 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/project/src/git_store.rs
+14 -11
View File
@@ -298,7 +298,7 @@ pub enum RepositoryState {
},
}
#[derive(Clone, Debug)]
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum RepositoryEvent {
Updated { full_scan: bool, new_instance: bool },
MergeHeadsChanged,
@@ -4839,17 +4839,20 @@ impl Repository {
this.snapshot.scan_id += 1;
}
if needs_update && let Some(updates_tx) = updates_tx {
updates_tx
.unbounded_send(DownstreamUpdate::UpdateRepository(
this.snapshot.clone(),
))
.ok();
if needs_update {
if let Some(updates_tx) = updates_tx {
updates_tx
.unbounded_send(DownstreamUpdate::UpdateRepository(
this.snapshot.clone(),
))
.ok();
}
cx.emit(RepositoryEvent::Updated {
full_scan: false,
new_instance: false,
});
}
cx.emit(RepositoryEvent::Updated {
full_scan: false,
new_instance: false,
});
})
},
);
crates/project/src/project_tests.rs
+302 -2
View File
@@ -1,7 +1,10 @@
#![allow(clippy::format_collect)]
use crate::{
Event, git_store::StatusEntry, task_inventory::TaskContexts, task_store::TaskSettingsLocation,
Event,
git_store::{GitStoreEvent, RepositoryEvent, StatusEntry},
task_inventory::TaskContexts,
task_store::TaskSettingsLocation,
*,
};
use async_trait::async_trait;
@@ -39,7 +42,14 @@ use rand::{Rng as _, rngs::StdRng};
use serde_json::json;
#[cfg(not(windows))]
use std::os;
use std::{env, mem, num::NonZeroU32, ops::Range, str::FromStr, sync::OnceLock, task::Poll};
use std::{
env, mem,
num::NonZeroU32,
ops::Range,
str::FromStr,
sync::{Arc, OnceLock},
task::Poll,
};
use task::{ResolvedTask, ShellKind, TaskContext};
use unindent::Unindent as _;
use util::{
@@ -8830,7 +8840,297 @@ async fn test_file_status(cx: &mut gpui::TestAppContext) {
});
}
#[gpui::test(iterations = 10)]
#[cfg_attr(target_os = "windows", ignore)]
async fn test_ignored_dirs_events(cx: &mut gpui::TestAppContext) {
init_test(cx);
cx.executor().allow_parking();
const IGNORE_RULE: &str = "**/target";
let root = TempTree::new(json!({
"project": {
"src": {
"main.rs": "fn main() {}"
},
"target": {
"debug": {
"important_text.txt": "important text",
},
},
".gitignore": IGNORE_RULE
},
}));
let root_path = root.path();
// Set up git repository before creating the worktree.
let work_dir = root.path().join("project");
let repo = git_init(work_dir.as_path());
repo.add_ignore_rule(IGNORE_RULE).unwrap();
git_add("src/main.rs", &repo);
git_add(".gitignore", &repo);
git_commit("Initial commit", &repo);
let project = Project::test(Arc::new(RealFs::new(None, cx.executor())), [root_path], cx).await;
let repository_updates = Arc::new(Mutex::new(Vec::new()));
let project_events = Arc::new(Mutex::new(Vec::new()));
project.update(cx, |project, cx| {
let repo_events = repository_updates.clone();
cx.subscribe(project.git_store(), move |_, _, e, _| {
if let GitStoreEvent::RepositoryUpdated(_, e, _) = e {
repo_events.lock().push(e.clone());
}
})
.detach();
let project_events = project_events.clone();
cx.subscribe_self(move |_, e, _| {
if let Event::WorktreeUpdatedEntries(_, updates) = e {
project_events.lock().extend(
updates
.iter()
.map(|(path, _, change)| (path.as_unix_str().to_string(), *change))
.filter(|(path, _)| path != "fs-event-sentinel"),
);
}
})
.detach();
});
let tree = project.read_with(cx, |project, cx| project.worktrees(cx).next().unwrap());
tree.flush_fs_events(cx).await;
tree.update(cx, |tree, cx| {
tree.load_file(rel_path("project/target/debug/important_text.txt"), cx)
})
.await
.unwrap();
tree.update(cx, |tree, _| {
assert_eq!(
tree.entries(true, 0)
.map(|entry| (entry.path.as_ref(), entry.is_ignored))
.collect::<Vec<_>>(),
vec![
(rel_path(""), false),
(rel_path("project/"), false),
(rel_path("project/.gitignore"), false),
(rel_path("project/src"), false),
(rel_path("project/src/main.rs"), false),
(rel_path("project/target"), true),
(rel_path("project/target/debug"), true),
(rel_path("project/target/debug/important_text.txt"), true),
]
);
});
assert_eq!(
repository_updates.lock().drain(..).collect::<Vec<_>>(),
vec![
RepositoryEvent::Updated {
full_scan: true,
new_instance: false,
},
RepositoryEvent::MergeHeadsChanged,
],
"Initial worktree scan should produce a repo update event"
);
assert_eq!(
project_events.lock().drain(..).collect::<Vec<_>>(),
vec![
("project/target".to_string(), PathChange::Loaded),
("project/target/debug".to_string(), PathChange::Loaded),
(
"project/target/debug/important_text.txt".to_string(),
PathChange::Loaded
),
],
"Initial project changes should show that all not-ignored and all opened files are loaded"
);
let deps_dir = work_dir.join("target").join("debug").join("deps");
std::fs::create_dir_all(&deps_dir).unwrap();
tree.flush_fs_events(cx).await;
project
.update(cx, |project, cx| project.git_scans_complete(cx))
.await;
cx.executor().run_until_parked();
std::fs::write(deps_dir.join("aa.tmp"), "something tmp").unwrap();
tree.flush_fs_events(cx).await;
project
.update(cx, |project, cx| project.git_scans_complete(cx))
.await;
cx.executor().run_until_parked();
std::fs::remove_dir_all(&deps_dir).unwrap();
tree.flush_fs_events(cx).await;
project
.update(cx, |project, cx| project.git_scans_complete(cx))
.await;
cx.executor().run_until_parked();
tree.update(cx, |tree, _| {
assert_eq!(
tree.entries(true, 0)
.map(|entry| (entry.path.as_ref(), entry.is_ignored))
.collect::<Vec<_>>(),
vec![
(rel_path(""), false),
(rel_path("project/"), false),
(rel_path("project/.gitignore"), false),
(rel_path("project/src"), false),
(rel_path("project/src/main.rs"), false),
(rel_path("project/target"), true),
(rel_path("project/target/debug"), true),
(rel_path("project/target/debug/important_text.txt"), true),
],
"No stray temp files should be left after the flycheck changes"
);
});
assert_eq!(
repository_updates.lock().as_slice(),
Vec::new(),
"No further repo events should happen, as only ignored dirs' contents was changed",
);
assert_eq!(
project_events.lock().as_slice(),
vec![
("project/target/debug/deps".to_string(), PathChange::Added),
("project/target/debug/deps".to_string(), PathChange::Removed),
],
"Due to `debug` directory being tracket, it should get updates for entries inside it.
No updates for more nested directories should happen as those are ignored",
);
}
#[gpui::test]
async fn test_odd_events_for_ignored_dirs(
executor: BackgroundExecutor,
cx: &mut gpui::TestAppContext,
) {
init_test(cx);
let fs = FakeFs::new(executor);
fs.insert_tree(
path!("/root"),
json!({
".git": {},
".gitignore": "**/target/",
"src": {
"main.rs": "fn main() {}",
},
"target": {
"debug": {
"foo.txt": "foo",
"deps": {}
}
}
}),
)
.await;
fs.set_head_and_index_for_repo(
path!("/root/.git").as_ref(),
&[
(".gitignore", "**/target/".into()),
("src/main.rs", "fn main() {}".into()),
],
);
let project = Project::test(fs.clone(), [path!("/root").as_ref()], cx).await;
let repository_updates = Arc::new(Mutex::new(Vec::new()));
let project_events = Arc::new(Mutex::new(Vec::new()));
project.update(cx, |project, cx| {
let repository_updates = repository_updates.clone();
cx.subscribe(project.git_store(), move |_, _, e, _| {
if let GitStoreEvent::RepositoryUpdated(_, e, _) = e {
repository_updates.lock().push(e.clone());
}
})
.detach();
let project_events = project_events.clone();
cx.subscribe_self(move |_, e, _| {
if let Event::WorktreeUpdatedEntries(_, updates) = e {
project_events.lock().extend(
updates
.iter()
.map(|(path, _, change)| (path.as_unix_str().to_string(), *change))
.filter(|(path, _)| path != "fs-event-sentinel"),
);
}
})
.detach();
});
let tree = project.read_with(cx, |project, cx| project.worktrees(cx).next().unwrap());
tree.update(cx, |tree, cx| {
tree.load_file(rel_path("target/debug/foo.txt"), cx)
})
.await
.unwrap();
tree.flush_fs_events(cx).await;
project
.update(cx, |project, cx| project.git_scans_complete(cx))
.await;
cx.run_until_parked();
tree.update(cx, |tree, _| {
assert_eq!(
tree.entries(true, 0)
.map(|entry| (entry.path.as_ref(), entry.is_ignored))
.collect::<Vec<_>>(),
vec![
(rel_path(""), false),
(rel_path(".gitignore"), false),
(rel_path("src"), false),
(rel_path("src/main.rs"), false),
(rel_path("target"), true),
(rel_path("target/debug"), true),
(rel_path("target/debug/deps"), true),
(rel_path("target/debug/foo.txt"), true),
]
);
});
assert_eq!(
repository_updates.lock().drain(..).collect::<Vec<_>>(),
vec![
RepositoryEvent::Updated {
full_scan: true,
new_instance: false,
},
RepositoryEvent::MergeHeadsChanged,
],
"Initial worktree scan should produce a repo update event"
);
assert_eq!(
project_events.lock().drain(..).collect::<Vec<_>>(),
vec![
("target".to_string(), PathChange::Loaded),
("target/debug".to_string(), PathChange::Loaded),
("target/debug/deps".to_string(), PathChange::Loaded),
("target/debug/foo.txt".to_string(), PathChange::Loaded),
],
"All non-ignored entries and all opened firs should be getting a project event",
);
// Emulate a flycheck spawn: it emits a `INODE_META_MOD`-flagged FS event on target/debug/deps, then creates and removes temp files inside.
// This may happen multiple times during a single flycheck, but once is enough for testing.
fs.emit_fs_event("/root/target/debug/deps", None);
tree.flush_fs_events(cx).await;
project
.update(cx, |project, cx| project.git_scans_complete(cx))
.await;
cx.executor().run_until_parked();
assert_eq!(
repository_updates.lock().as_slice(),
Vec::new(),
"No further repo events should happen, as only ignored dirs received FS events",
);
assert_eq!(
project_events.lock().as_slice(),
Vec::new(),
"No further project events should happen, as only ignored dirs received FS events",
);
}
#[gpui::test(iterations = 10)]
async fn test_repos_in_invisible_worktrees(
executor: BackgroundExecutor,
cx: &mut gpui::TestAppContext,