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

[Mike Snitzer]

On Tue, Aug 18 2015 at  5:07pm -0400,
Mike Snitzer <snitzer at redhat.com> wrote:

> On Tue, Aug 18 2015 at  4:26pm -0400,
> Mikulas Patocka <mpatocka at redhat.com> wrote:
> 
> > Mike, please submit this patch to the upstream kernel before 4.2 is 
> > released, so that the all the kernels that support the options 
> > "precise_timestamps" and "histogram" also report these values back.
> 
> It is really late to be sending pull requests for 4.2 (next release is
> likely 4.2 final).  I've already sent 6 'fixes' pull requests to Linus
> for 4.2.  This patch is just too late, sorry.
> 
> 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

Bryn, please verify this change is sufficient for your needs.