Christoph Hellwig [off-list ref] writes:

On Fri, Feb 26, 2016 at 04:18:55PM -0500, Jeff Moyer wrote:

quoted

Christoph Hellwig [off-list ref] writes:

quoted

This series allows to selectively enable/disable polling for completions
in the block layer on a per-I/O basis.  For this it resurrects the
preadv2/pwritev2 syscalls that Milosz prepared a while ago (and which
are much simpler now due to VFS changes that happened in the meantime).
That approach also had a man page update prepared, which I will resubmit
with the current flags once this series makes it in.

It would be helpful for reviewers if you submitted the man page at the
same time, in my opinion.

Ok.

quoted

Do you have any plans on adding polling support to the buffered path?

How would that even make sense?

I admit I haven't looked into the implementation details, but I was
thinking about O_SYNC writes or reads that missed the cache.

Thinking about this some more, it occurs to me that a file opened with
O_SYNC will still incur context switching.  Do you think we should add
that to the NOTES section of the man page?

Cheers,
Jeff