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SubjectRe: [PATCH] blk queue io tracing support
Nathan Scott writes:
> Hi Tom,
> On Tue, Aug 30, 2005 at 11:19:04PM -0500, Tom Zanussi wrote:
> > You're right, it should be using simple_rmdir rather than
> > simple_unlink for removing directories. Thanks for sending the patch,
> No problem.
> > which I've modified a bit to avoid splitting the rmdir/unlink cases
> > into separate functions, since they're almost the same except for what
> > they end up calling. relayfs_remove_dir now doesn't do anything but
> > call relayfs_remove (it didn't do much more than that before anyway),
> > but it makes sense to me to keep it, as the counterpart to
> > relayfs_create_dir. Let me know if you see any problems with it.
> Looks OK, I'll give it a spin.
> On an unrelated note, are there any known issues with using epoll
> on relayfs file descriptors? I'm having a few troubles, and just
> wondering if its me doing something silly, or if its known to not
> work...? Symptoms of the problem are epoll continually reaching
> its timeout with no modified fds found (when I know the inode has
> modified trace buffers attached) ... and the epoll code is a bit
> too hairy for me to go find a quick fix - seems like it should be
> able to work though since relayfs has a ->poll implementation.

Well, the relayfs poll implementation is based on completed
sub-buffers, so you can be writing events into a buffer, but until a
buffer switch happens, you won't be notified that anything's changed.
The reason for the sub-buffer granularity is that relayfs was
originally meant for use only with mmap(), but now that there's a
read(), I'll probably have to make some changes to the poll
implementation as well.


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