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Make File opening in VirtualFile async-compatible (#5280)

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## Problem

Previously, we were using `observe_closure_duration` in `VirtualFile`
file opening code, but this doesn't support async open operations, which
we want to use as part of #4743.

## Summary of changes

* Move the duration measurement from the `with_file` macro into a
`observe_duration` macro.
* Some smaller drive-by fixes to replace the old strings with the new
variant names introduced by #5273

Part of #4743, follow-up of #5247.
This commit is contained in:
Arpad Müller
2023-09-11 18:41:08 +02:00
committed by GitHub
parent 76cc87398c
commit a18d6d9ae3
1 changed files with 17 additions and 11 deletions
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28
pageserver/src/virtual_file.rs
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@@ -154,7 +154,7 @@ impl OpenFiles {
// old file.
//
if let Some(old_file) = slot_guard.file.take() {
// the normal path of dropping VirtualFile uses "close", use "close-by-replace" here to
// the normal path of dropping VirtualFile uses `Close`, use `CloseByReplace` here to
// distinguish the two.
STORAGE_IO_TIME_METRIC
.get(StorageIoOperation::CloseByReplace)
@@ -209,9 +209,12 @@ impl CrashsafeOverwriteError {
}
}
macro_rules! with_file {
($this:expr, $op:expr, | $ident:ident | $($body:tt)*) => {{
let $ident = $this.lock_file().await?;
/// Observe duration for the given storage I/O operation
///
/// Unlike `observe_closure_duration`, this supports async,
/// where "support" means that we measure wall clock time.
macro_rules! observe_duration {
($op:expr, $($body:tt)*) => {{
let instant = Instant::now();
let result = $($body)*;
let elapsed = instant.elapsed().as_secs_f64();
@@ -219,6 +222,13 @@ macro_rules! with_file {
.get($op)
.observe(elapsed);
result
}}
}
macro_rules! with_file {
($this:expr, $op:expr, | $ident:ident | $($body:tt)*) => {{
let $ident = $this.lock_file().await?;
observe_duration!($op, $($body)*)
}};
}
@@ -260,9 +270,7 @@ impl VirtualFile {
}
let (handle, mut slot_guard) = get_open_files().find_victim_slot().await;
let file = STORAGE_IO_TIME_METRIC
.get(StorageIoOperation::Open)
.observe_closure_duration(|| open_options.open(path))?;
let file = observe_duration!(StorageIoOperation::Open, open_options.open(path))?;
// Strip all options other than read and write.
//
@@ -405,9 +413,7 @@ impl VirtualFile {
let (handle, mut slot_guard) = open_files.find_victim_slot().await;
// Open the physical file
let file = STORAGE_IO_TIME_METRIC
.get(StorageIoOperation::Open)
.observe_closure_duration(|| self.open_options.open(&self.path))?;
let file = observe_duration!(StorageIoOperation::Open, self.open_options.open(&self.path))?;
// Store the File in the slot and update the handle in the VirtualFile
// to point to it.
@@ -595,7 +601,7 @@ impl Drop for VirtualFile {
fn clean_slot(slot: &Slot, mut slot_guard: RwLockWriteGuard<'_, SlotInner>, tag: u64) {
if slot_guard.tag == tag {
slot.recently_used.store(false, Ordering::Relaxed);
// there is also operation "close-by-replace" for closes done on eviction for
// there is also the `CloseByReplace` operation for closes done on eviction for
// comparison.
STORAGE_IO_TIME_METRIC
.get(StorageIoOperation::Close)