[dm-devel] dm-statistics: report precise timestamps and histogram

[Bryn M. Reeves]

On Wed, Aug 19, 2015 at 06:50:36AM -0400, Mikulas Patocka wrote:
> On Wed, 19 Aug 2015, Bryn M. Reeves wrote:
> > On Tue, Aug 18, 2015 at 05:41:12PM -0400, Mike Snitzer wrote:
> > > On Tue, Aug 18 2015 at  5:07pm -0400,
> > > Mike Snitzer <snitzer at redhat.com> wrote:
> > > > But what I will do is tag this commit for 4.2-stable inclusion.
> > > > 
> > > > Userspace will have to check the DM ioctl version to know if DM provides
> > > > these extra keywords.
> > > 
> > > I've staged the following for 4.3:
> > > https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=for-next&id=bd49784fd1e8f42c7600fbfa206361324857f373
> > > 
> > Unfortuntely the fact that there are kernels out there without this
> > means that we will need to either carry a workaround in dmstats
> > userspace forever or just disallow use of these features on those
> > kernels.
> 
> That's why I think it should be submitted to 4.2 now - so that there won't 
> be an upstream kernel without this feature.

Agreed: that's the ideal situation.

Regards,
Bryn.