From: Jaegeuk Kim Subject: Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm Date: Tue, 19 May 2015 00:59:05 -0700 Message-ID: <20150519075905.GA40521@jaegeuk-mac02.hsd1.ca.comcast.net> References: <1432014416-39326-1-git-send-email-jaegeuk@kernel.org> <20150519054945.GA28060@gondor.apana.org.au> <20150519062430.GA39588@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519063211.GA28347@gondor.apana.org.au> <20150519065812.GA40012@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519065929.GA28610@gondor.apana.org.au> <20150519071317.GB40012@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519071521.GA28862@gondor.apana.org.au> <20150519072740.GA40281@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519073012.GA29030@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: davem@davemloft.net, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, ecryptfs@vger.kernel.org, linux-arm-kernel@lists.infradead.org To: Herbert Xu Return-path: Received: from mail.kernel.org ([198.145.29.136]:35991 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754440AbbESH7I (ORCPT ); Tue, 19 May 2015 03:59:08 -0400 Content-Disposition: inline In-Reply-To: <20150519073012.GA29030@gondor.apana.org.au> Sender: linux-crypto-owner@vger.kernel.org List-ID: On Tue, May 19, 2015 at 03:30:12PM +0800, Herbert Xu wrote: > 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? I didn't measure the memory footprint. I can't tell it is a real problem, but at least, I hope it can reduce somewhat memory consumption. Because, already per-inode crypto structure consumes at least 84 bytes. > > > 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. Ok, I'll check it again and investigate in more detail how not to break this rule. Thank you very much for the comments. > > Cheers, > -- > Email: Herbert Xu > Home Page: http://gondor.apana.org.au/~herbert/ > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt