linux-kernel - Re: [PATCH 02/11] blkcg: __blkg_lookup_create() doesn't have to fail on radix tree preload failure

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Date:	Fri, 27 Apr 2012 10:42:58 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	containers@...ts.linux-foundation.org, fengguang.wu@...el.com,
	hughd@...gle.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 02/11] blkcg: __blkg_lookup_create() doesn't have to fail
 on radix tree preload failure

On Thu, Apr 26, 2012 at 02:59:12PM -0700, Tejun Heo wrote:
> __blkg_lookup_create() currently fails if radix_tree_preload() fails;
> however, preload failrue doesn't imply insertion failure.  Don't fail
> __blkg_lookup_create() on preload failure.
> 

Hi Tejun,

If we are going to try the insertion anyway irrespective of the fact
whether preload succeeded or not, they why call radix_tree_preload()
at all? How does that help?

Thanks
Vivek
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