linux-kernel - Re: [PATCH 1/2] tmpfs: Quick token library to allow scalable retrieval of tokens from token jar

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Date:	Wed, 26 May 2010 12:33:24 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 1/2] tmpfs: Quick token library to allow scalable
 retrieval of tokens from token jar

Andrew,

I've fixed the issues that you brought up for this patch series. I have
sent out version 2 patches in separate mails.  
I've followed up on one of your comments below to explain why I'm doing
things done differently from your suggestions.

On Thu, 2010-05-20 at 16:08 -0700, Andrew Morton wrote:

> > +
> > +struct qtoken {
> > +	long		pool;	/* pool of free tokens */
> > +	long		total;  /* total num of tokens */
> > +#ifdef CONFIG_SMP
> > +	long		init_cache_sz; /* initial cache size */
> 
> I don't think that it si meaningful for any of these things to have
> negative values, so an unsigned type would be more appropriate.
> 
> Did they really need to be `long'?  Plain old `unsigned' might be more
> efficient, perhaps.

I've changed "pool" and "total" to unsigned long.  However, since tmpfs
uses unsigned long for the free blocks, I have to use unsigned long
instead of unsigned for the token jar to maintain compatibility with
tmpfs.

Thank you for your review.

Regards,
Tim Chen

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