On Fri, Jul 25, 2014 at 01:37:19PM -0400, Abhijith Das wrote: > Hi all, > > The topic of a readdirplus-like syscall had come up for discussion at last > year's > LSF/MM collab summit. I wrote a couple of syscalls with their GFS2 > implementations > to get at a directory's entries as well as stat() info on the individual > inodes. > I'm presenting these patches and some early test results on a single-node GFS2 > filesystem. > > 1. dirreadahead() - This patchset is very simple compared to the xgetdents() > system > call below and scales very well for large directories in GFS2. dirreadahead() > is > designed to be called prior to getdents+stat operations.
Hmm. Have you tried plumbing these read-ahead calls in under the normal getdents() syscalls? We don't have a filereadahead() syscall and yet we somehow manage to implement buffered file data read-ahead :). - z
