linux-kernel - Re: [PATCH] Export symbol ksize()

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Message-ID: <84144f020902160929k67ce1881p959646a326bb3f40@mail.gmail.com>
Date:	Mon, 16 Feb 2009 19:29:59 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Joe Perches <joe@...ches.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-crypto@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Geert.Uytterhoeven@...ycom.com
Subject: Re: [PATCH] Export symbol ksize()

On Mon, 2009-02-16 at 14:56 +0100, Johannes Weiner wrote:
>> One problem is that zeroing ksize()
>> bytes can have an overhead of nearly twice the actual allocation size.

On Mon, Feb 16, 2009 at 6:32 PM, Joe Perches <joe@...ches.com> wrote:
> A possible good thing is when linux has a
> mechanism to use known zeroed memory in
> kzalloc or kcalloc, it's already good to go.

Hmm, kzfree() is not going to be all that common operation so there
won't be that many known zeroed regions and I suspect tracking them
will have more overhead than just doing the memset().
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