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| author | Michael Pratt <mpratt@google.com> | 2019-06-21 16:26:26 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-06-21 16:27:26 -0700 |
| commit | 6f933a934f715f4bcd4f4e4430d4040b6cf61032 (patch) | |
| tree | 4402c27bcb692270850cffe6d7c5b862b3321b6d /pkg/sentry/fs/mounts_test.go | |
| parent | ae4ef32b8c77a067229c593af784fbfa3098fd97 (diff) | |
Remove O(n) lookup on unlink/rename
Currently, the path tracking in the gofer involves an O(n) lookup of
child fidRefs. This causes a significant overhead on unlinks in
directories with lots of child fidRefs (<4k).
In this transition, pathNode moves from sync.Map to normal synchronized
maps. There is a small chance of contention in walk, but the lock is
held for a very short time (and sync.Map also had a chance of requiring
locking).
OTOH, sync.Map makes it very difficult to add a fidRef reverse map.
PiperOrigin-RevId: 254489952
Diffstat (limited to 'pkg/sentry/fs/mounts_test.go')
0 files changed, 0 insertions, 0 deletions