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cleanup(bpf): reduce preemption fragility in overlayfs dedup #558

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Merged
Stringy merged 2 commits into from
Apr 28, 2026
Merged

cleanup(bpf): reduce preemption fragility in overlayfs dedup #558

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fd03a98
cleanup(bpf): no need for LRU hash
Stringy Apr 27, 2026
9c7f636
Prevent preemption fragility; reinstating LRU + 256 entries
Stringy Apr 28, 2026
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4 changes: 2 additions & 2 deletions fact-ebpf/src/bpf/maps.h
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Original file line number Diff line number Diff line change
Expand Up @@ -100,10 +100,10 @@ struct {
// Track pid_tgid of overlayfs file_open events so we can skip the
// duplicate underlying filesystem event that follows immediately.
struct {
__uint(type, BPF_MAP_TYPE_LRU_PERCPU_HASH);
__uint(type, BPF_MAP_TYPE_LRU_HASH);
__type(key, __u64);
__type(value, char);
__uint(max_entries, 1);
__uint(max_entries, 256);
} overlayfs_dedup SEC(".maps");

__always_inline static struct metrics_t* get_metrics() {
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