docs(audits): profile 100K metadata application time (#1046)#3926
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Audit metadata apply pipeline (chmod/chown/utimensat/setxattr/setfacl), quantify the 300K-syscall floor at 100K files, plan strace-c profiling, confirm rayon par_iter wiring through apply_metadata_from_file_entry (threshold 64), and enumerate io_uring statx, O_PATH fchownat, and skip-if-equal optimization candidates.
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May 18, 2026
Audit metadata apply pipeline (chmod/chown/utimensat/setxattr/setfacl), quantify the 300K-syscall floor at 100K files, plan strace-c profiling, confirm rayon par_iter wiring through apply_metadata_from_file_entry (threshold 64), and enumerate io_uring statx, O_PATH fchownat, and skip-if-equal optimization candidates.
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Summary
crates/metadata/src/apply/pipeline (chown -> chmod -> utimensat -> crtime, plus xattr / ACL fan-out) and maps each step to its path-based and fd-based syscall.-aHAX --owner --group, lays out anstrace -cprofile plan inside thersync-profilecontainer, and confirms rayonpar_iterwiring viatransfer::parallel_io::map_blocking(threshold 64, cross-ref Support leading signs in bwlimit parsing #1083 stat-batch).statxbatches,fchownat(AT_EMPTY_PATH)over O_PATH dir fds, skip-if-equal short-circuit beforeutimensat, coalescedsetxattr, NUMA-aware rayon pool.Closes #1046.
Test plan
crates/metadata/src/apply/{ownership,permissions,timestamps}.rs