[email protected] (YAMAMOTO Takashi) wrote: > > <...> > > > > With the attached diff the locking protocol requests at least a shared > > lock and all calls to VOP_GETATTR() outside of file systems respect it. > > > > <...> > > postgresql assumes instant lseek(SEEK_END) to get the size of > their heap files. > > http://rhaas.blogspot.com/2011/11/linux-lseek-scalability.html > > as fsync etc keeps the vnode lock during i/o, it might cause severe > performance regression.
I wonder if it is worth having a separate VOP for that, which would retrieve a subset of vattr without lock held. There are potentially more uses in the tree. -- Mindaugas
