linux-kernel - Re: [PATCH 03/12] blkcg: convert blkg_lookup

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Message-ID: <20180911235009.GC2966370@devbig004.ftw2.facebook.com>
Date:   Tue, 11 Sep 2018 16:50:09 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Dennis Zhou <dennisszhou@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Johannes Weiner <hannes@...xchg.org>,
        Josef Bacik <josef@...icpanda.com>, kernel-team@...com,
        linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/12] blkcg: convert blkg_lookup_create to find closest
 blkg

On Tue, Sep 11, 2018 at 02:41:28PM -0400, Dennis Zhou wrote:
> From: "Dennis Zhou (Facebook)" <dennisszhou@...il.com>
> 
> There are several scenarios where blkg_lookup_create can fail. Examples
> include the blkcg dying, request_queue is dying, or simply being OOM. At
> the end of the day, most handle this by simply falling back to the
> q->root_blkg and calling it a day.
> 
> This patch implements the notion of closest blkg. During
> blkg_lookup_create, if it fails to create, return the closest blkg
> found or the q->root_blkg. blkg_try_get_closest is introduced and used
> during association so a bio is always attached to a blkg.
> 
> Signed-off-by: Dennis Zhou <dennisszhou@...il.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun