linux-kernel - Re: [PATCH v2 22/23] percpu: update pcpu_find_block

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Date:   Tue, 25 Jul 2017 15:47:44 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Dennis Zhou <dennisz@...com>
Cc:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@...com, Dennis Zhou <dennisszhou@...il.com>
Subject: Re: [PATCH v2 22/23] percpu: update pcpu_find_block_fit to use an
 iterator

On Mon, Jul 24, 2017 at 07:02:19PM -0400, Dennis Zhou wrote:
> From: "Dennis Zhou (Facebook)" <dennisszhou@...il.com>
> 
> The simple, and expensive, way to find a free area is to iterate over
> the entire bitmap until an area is found that fits the allocation size
> and alignment. This patch makes use of an iterate that find an area to
> check by using the block level contig hints. It will only return an area
> that can fit the size and alignment request. If the request can fit
> inside a block, it returns the first_free bit to start checking from to
> see if it can be fulfilled prior to the contig hint. The pcpu_alloc_area
> check has a bound of a block size added in case it is wrong.
> 
> Signed-off-by: Dennis Zhou <dennisszhou@...il.com>

Reviewed-by: Josef Bacik <jbacik@...com>

Thanks,

Josef