linux-kernel - Re: [PATCH v6] hashtable: introduce a small and naive hashtable

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Date:	Thu, 27 Sep 2012 09:03:03 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Sasha Levin <levinsasha928@...il.com>,
	torvalds@...ux-foundation.org, tj@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com, neilb@...e.de, bfields@...ldses.org,
	ejt@...hat.com, snitzer@...hat.com, edumazet@...gle.com,
	josh@...htriplett.org, rmallon@...il.com, palves@...hat.com
Subject: Re: [PATCH v6] hashtable: introduce a small and naive hashtable

* David Laight (David.Laight@...LAB.COM) wrote:
> > > > And even then, if we would do:
> > > >
> > > >  	for (i = 0; i < HASH_SIZE(hashtable); i++)
> > > >  		if (!hlist_empty(&hashtable[i]))
> > > >  			break;
> > > >
> > > >  	return i >= HASH_SIZE(hashtable);
> > > >
> > > > What happens if the last entry of the table is non-empty ?
> > >
> > > It still works, as 'i' is not incremented due to the break. And i will
> > > still be less than HASH_SIZE(hashtable). Did you have *your* cup of
> > > coffee today? ;-)
> > 
> > Ahh, right! Actually I had it already ;-)
> 
> I tend to dislike the repeated test, gcc might be able to optimise
> it away, but the code is cleaner written as:
> 
> 	for (i = 0; i < HASH_SIZE(hashtable); i++)
> 		if (!hlist_empty(&hashtable[i]))
> 			return false;
> 	return true;
> 

Agreed, this looks like a good way to write it.

> > Agreed that the flags should be removed. Moving to define + static
> > inline is still important though.
> 
> Not sure I'd bother making the function inline.

Do you mean you prefer to keep it as a macro, or that you don't think
the "inline" keyword is relevant anymore, and want to do a "static" only
function in the header file ?

In both cases, please explain the reasons for doing things that way.

Thanks,

Mathieu

> 
> 	David
> 
> 
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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