netdev - Re: [PATCH][RFC] Infrastructure for compact call location representation

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Message-ID: <874ohc65es.fsf@basil.nowhere.org>
Date:	Wed, 09 Jun 2010 09:17:47 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David VomLehn <dvomlehn@...co.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH][RFC] Infrastructure for compact call location representation

David VomLehn <dvomlehn@...co.com> writes:

First your mailer generates broken cc addresses like
"netdev@...r.kernel.org"@cisco.com

> This patch allows the location of a call to be recorded as a small integer,
> with each call location ("callsite") assigned a new value the first time
> the code in that location is executed. Locations can be recorded as a
> an address or as a __FILE__/__LINE__ pair. The later is easier to read, but
> requires significantly more space.

Seems overly complicated.

How about using a hash of __FILE__, __LINE__ instead? 
With some care you can write it in a way that it gets completely
evaluated by gcc at compile time, so it's just a constant then.

That may use a few more bits then, but that's far better
than having so much runtime overhead for this.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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