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Author SHA1 Message Date
Fabricio VoznikaandgVisor bot c11e8606de 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
 2021-04-20 11:48:48 -07:00
Adin ScannellandCopybara-Service 412a92112f Add basic microbenchmarks. 
PiperOrigin-RevId: 296104390
 2020-02-19 18:21:54 -08:00