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Date: Tue, 30 Sep 2014 11:49:19 -0400
From: Mike Snitzer <snitzer@redhat.com>
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Subject: Re: [linux-lvm] thin pool and discards
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To: Vasiliy Tolstov <v.tolstov@selfip.ru>
Cc: LVM general discussion and development <linux-lvm@redhat.com>

On Tue, Sep 30 2014 at 10:57am -0400,
Vasiliy Tolstov <v.tolstov@selfip.ru> wrote:

> 2014-09-30 18:35 GMT+04:00 Zdenek Kabelac <zkabelac@redhat.com>:
> > Kernel 3.10 is too old,
> > Please repeat the test with at least 3.16
> 
> 
> Why? As i understand 3.10 lts... Can you say me what patches i need to
> cherry pick? Or maybe redhat kernel have this feature...?

You likely need this upstream commit:
http://git.kernel.org/linus/19fa1a6756ed9e92daa9537c03b47d6b55cc2316

Though that commit was tagged for stable.  So not sure.

In general, upstream dm-thinp saw quite a few improvements that in
combination results in a much more stable dm-thinp (particularly error
handling from faults and out of space conditions).

RHEL7 does include these changes.