linux-kernel - Re: [PATCH 1/2] Make the batch size of the percpu

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Message-ID: <1367423619.27102.198.camel@schen9-DESK>
Date:	Wed, 01 May 2013 08:53:39 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Simon Jeons <simon.jeons@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <ak@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 1/2] Make the batch size of the percpu_counter
 configurable

On Wed, 2013-05-01 at 12:52 +0800, Simon Jeons wrote:
> Hi Tim,
> On 04/30/2013 01:12 AM, Tim Chen wrote:
> > Currently, there is a single, global, variable (percpu_counter_batch) that
> > controls the batch sizes for every 'struct percpu_counter' on the system.
> >
> > However, there are some applications, e.g. memory accounting where it is
> > more appropriate to scale the batch size according to the memory size.
> > This patch adds the infrastructure to be able to change the batch sizes
> > for each individual instance of 'struct percpu_counter'.
> >
> > I have chosen to implement the added field of batch as a pointer
> > (by default point to percpu_counter_batch) instead
> > of a static value.  The reason is the percpu_counter initialization
> > can be called when we only have boot cpu and not all cpus are online.
> 
> What's the meaning of boot cpu? Do you mean cpu 0?
> 

Yes.

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