linux-kernel - Re: [RFC v2] percpu: Add a separate function to merge free areas

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Message-ID: <CALYGNiNioi3qaRy8VOSBshWtCBJc_qq4FRVVX85F+_aA6QtfKg@mail.gmail.com>
Date:	Fri, 5 Dec 2014 10:25:07 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Leonard Crestez <lcrestez@...acom.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Sorin Dumitru <sdumitru@...acom.com>
Subject: Re: [RFC v2] percpu: Add a separate function to merge free areas

On Fri, Dec 5, 2014 at 12:20 AM, Christoph Lameter <cl@...ux.com> wrote:
> On Thu, 4 Dec 2014, Tejun Heo wrote:
>
>> Docker usage is pretty wide-spread now, making what used to be
>> siberia-cold paths hot enough to cause actual scalability issues.
>> Besides, we're now using percpu_ref for things like aio and cgroup
>> control structures which can be created and destroyed quite
>> frequently.  I don't think we can say these are "weird" use cases
>> anymore.
>
> Well then lets write a scalable percpu allocator.

percpu allocator maybe be overkill but I think it's worth to make
kmem_cache-like thing with pool of objects.

>
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