linux-kernel - Re: [PATCH] [percpu] Make the unit size of the first chunk the same as other chunks

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Date:	Wed, 29 Oct 2014 20:07:06 -0400
From:	Zhihui Zhang <zzhsuny@...il.com>
To:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [percpu] Make the unit size of the first chunk the same
 as other chunks

I see your point. Thanks.

-Zhihui

On Wed, Oct 29, 2014 at 12:18 AM, Tejun Heo <tj@...nel.org> wrote:
> Plesae restore lkml cc when replying.
>
> On Tue, Oct 28, 2014 at 08:12:30PM -0400, Zhihui Zhang wrote:
>> My patch just increases the dynamic area in the first chunk slightly
>> to cover the round up surplus. On my 64-bit laptop, it is 12288 bytes.
>
> As I wrote before, it's 12288 bytes on your laptop but it can be much
> larger on other setups.
>
>> It will mostly likely be used, and in fact, a second chunk will be
>> most likely needed as well.  So in theory you are right, but in
>> practice, it probably won't matter.
>
> If the initial dynamic reserve is too small, which could be the case
> given the overall increase in percpu memory, increase
> PERCPU_DYNAMIC_EARLY_SIZE.
>
> --
> tejun
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