[dm-devel] [PATCH 3/4] dm stats: report histogram of latencies

[Vivek Goyal]

On Tue, Jun 09, 2015 at 05:22:05PM -0400, Mikulas Patocka wrote:
> This patch adds an option to dm statistics to collect and report the
> histogram of latencies.
> 
> Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>

I am wondering how does histogram help. IOW, if disks are bad, will
average latencies not go up as well and that one can already calcualte
using existing stats.

Thanks
Vivek