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

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Message-ID: <20150519073012.GA29030@gondor.apana.org.au>
Date:	Tue, 19 May 2015 15:30:12 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	davem@...emloft.net, linux-crypto@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net, ecryptfs@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm

On Tue, May 19, 2015 at 12:27:40AM -0700, Jaegeuk Kim wrote:
>
> So, IMHO, it can consume memory too much, since tfm should be allocated for
> every inodes and be alive until inode eviction.

Are you sure this is a real problem? Have you actually looked at
how much memory it consumes?

> Apart from giving GFP_NOFS, do you mean that it is a wrong approach?

Allocating the tfm and setting a key on the data path is not
acceptable.

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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