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Use access counter for file cache pages

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This commit is contained in:
Konstantin Knizhnik
2022-11-04 12:55:21 +02:00
parent 81527300ef
commit 7f67f65d92
1 changed files with 2 additions and 0 deletions
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2
pageserver/src/page_image_cache.rs
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@@ -94,6 +94,7 @@ impl PageImageCache {
VirtualFile::open_with_options(
&std::path::PathBuf::from("page.cache"),
std::fs::OpenOptions::new()
.read(true)
.write(true)
.create(true)
.truncate(true),
@@ -234,6 +235,7 @@ pub fn lookup(timeline: &Timeline, rel: RelTag, blkno: BlockNumber, lsn: Lsn) ->
let mut buf = [0u8; PAGE_SZ];
file.read_exact_at(&mut buf, index as u64 * PAGE_SZ as u64)?;
cache = this.lock().unwrap();
assert!(cache.pages[index].access_count > 0);
cache.pages[index].access_count -= 1;
if cache.pages[index].access_count == 0 {
// Move to the head of LRU list