linux-ext4 - Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc

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Message-ID: <20150520154205.GA13539@gondor.apana.org.au>
Date:	Wed, 20 May 2015 23:42:05 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Theodore Ts'o <tytso@....edu>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Jaegeuk Kim <jaegeuk@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-f2fs-devel@...ts.sourceforge.net, ecryptfs@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm

On Wed, May 20, 2015 at 05:30:14PM +0200, Ard Biesheuvel wrote:
> 
> However, it's quite a can of worms you're opening here. Speed is
> easily quantified, and it may even be feasible to introduce some kind
> of boottime benchmark to select the fastest implementation available
> (like already exists for xor and raid6, for instance).
> @Herbert: was something like this ever proposed? And would you
> consider merging it if it were implemented adequately?

Up until now static priorities have been sufficient in selecting
the best implementation.  However, if you can show us a case where
a given implementation is slower on one host but faster on another
then sure we can add a run-time test and priority adjustment for it.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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