Re: [RFC] readdirplus implementations: xgetdents vs dirreadahead syscalls

[Zach Brown]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/