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Subject: Re: [PATCH 2/2 block/for-linus] writeback: don't drain
 bdi_writeback_congested on bdi destruction
To: Tejun Heo <tj@kernel.org>, Jens Axboe <axboe@kernel.dk>
References: <20150702005253.GA26440@mtj.duckdns.org>
 <20150702005337.GB26440@mtj.duckdns.org>
Cc: linux-kernel@vger.kernel.org
From: Jon Christopherson <jon@jons.org>
Message-ID: <5594A9B6.2050100@jons.org>
Date: Wed, 1 Jul 2015 22:02:14 -0500
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On 07/01/2015 07:53 PM, Tejun Heo wrote:
> 52ebea749aae ("writeback: make backing_dev_info host cgroup-specific
> bdi_writebacks") made bdi (backing_dev_info) host per-cgroup wb's
> (bdi_writeback's).  As the congested state needs to be per-wb and
> referenced from blkcg side and multiple wbs, the patch made all
> non-root cong's (bdi_writeback_congested's) reference counted and
> indexed on bdi.
>
<snip>

Thanks Tejun,

     I have applied your patches and no longer see the behavior 
mentioned in the bug report. All is well!

-Jon