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| author | Fabricio Voznika <fvoznika@google.com> | 2021-04-20 11:47:28 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-04-20 11:48:48 -0700 |
| commit | bf1e14cf8a24100fd12292a87e4fc3a439399669 (patch) | |
| tree | 27fb92b2f070da4efd4ae0b455cf2091ccee8b07 /pkg/sentry/vfs/vfs.go | |
| parent | 3fff4c4a0fbb1b132348d4b82f61cc38a4cc6cb2 (diff) | |
Speed up O_APPEND with remote revalidating
Remote revalidating requires to update file size on every write
on a file opened with O_APPEND. If host FD exists, it can be
used to update the size and skip round trip to the gofer. With
this change, O_APPEND writes with remote revalidating is almost
as fast as exclusive mode:
BM_Append
VFS1 60.7us
VFS2 56.8us
VFS2 exclusive 14.2us
This change 15.8us
Updates #1792
PiperOrigin-RevId: 369486801
Diffstat (limited to 'pkg/sentry/vfs/vfs.go')
0 files changed, 0 insertions, 0 deletions