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From: Rik van Riel <riel@redhat.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: "Jörn Engel" <joern@wohnheim.fh-wedel.de>,
	"Kallol Biswas" <kbiswas@neoscale.com>,
	linux-kernel@vger.kernel.org,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: partially encrypted filesystem
Date: Fri, 19 Dec 2003 10:01:43 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44.0312190959440.11948-100000@chimarrao.boston.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0312031600460.2055@home.osdl.org>

On Wed, 3 Dec 2003, Linus Torvalds wrote:

> And that in turn causes problems. You get all kinds of interesting
> deadlock schenarios when write-out requires more memory in order to
> succeed.

I suspect this should be fixable with just a simple mempool.

Opportunistic allocation of encrypt-and-IO buffers to keep
performance decent when there's lots of memory available,
fallback to the mempool when free memory is low.

In real emergencies the IO completion code could probably
free the encrypt-and-IO buffer into the mempool.

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan


  parent reply	other threads:[~2003-12-19 15:03 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-03 21:07 partially encrypted filesystem Kallol Biswas
2003-12-03 21:44 ` Richard B. Johnson
2003-12-03 23:20   ` bill davidsen
2003-12-03 21:44 ` Jörn Engel
2003-12-04  0:08   ` Linus Torvalds
2003-12-04  1:25     ` Jeff Garzik
2003-12-04  2:08       ` Linus Torvalds
2003-12-04  3:59       ` H. Peter Anvin
2003-12-04  2:37     ` Charles Manning
2003-12-04 14:17     ` Jörn Engel
2003-12-04 15:20       ` Linus Torvalds
2003-12-04 16:07         ` Phillip Lougher
2003-12-04 17:26         ` Jörn Engel
2003-12-04 18:20           ` Phillip Lougher
2003-12-04 18:40             ` Jörn Engel
2003-12-04 19:41             ` Erez Zadok
2003-12-05 11:20               ` Jörn Engel
2003-12-05 16:16                 ` Erez Zadok
2003-12-05 19:14                   ` Matthew Wilcox
2003-12-05 19:47                     ` Erez Zadok
2003-12-05 20:28                       ` Matthew Wilcox
2003-12-05 21:38                         ` Pat LaVarre
2003-12-06  0:15                         ` Maciej Zenczykowski
2003-12-06  1:35                           ` Pat LaVarre
2003-12-06  2:39                             ` Valdis.Kletnieks
2003-12-06 11:43                             ` Maciej Zenczykowski
2003-12-07  0:04                               ` Shaya Potter
2003-12-08 14:08                               ` Jörn Engel
2003-12-06  0:50                         ` Phillip Lougher
2003-12-08 11:37                           ` David Woodhouse
2003-12-08 13:44                             ` phillip
2003-12-08 14:07                               ` David Woodhouse
2003-12-10  1:16                               ` [OT?]Re: " Charles Manning
2003-12-10 17:45                                 ` Phillip Lougher
2003-12-09 23:40                             ` Pat LaVarre
2003-12-10  0:07                             ` Pavel Machek
2003-12-10  1:28                               ` Pat LaVarre
2003-12-10  2:13                               ` Charles Manning
2003-12-05 19:58                     ` Pat LaVarre
2003-12-08 11:28             ` David Woodhouse
2003-12-08 13:49               ` phillip
2003-12-04 19:18           ` David Wagner
2003-12-05 13:02             ` Jörn Engel
2003-12-05 17:28               ` Frank v Waveren
2003-12-05 23:59               ` David Wagner
2003-12-19 15:01     ` Rik van Riel [this message]
2003-12-04  3:10 ` Valdis.Kletnieks
2003-12-04 18:16 ` Hans Reiser
2003-12-06 19:56 Pat LaVarre
2003-12-06 22:07 ` Maciej Zenczykowski
2003-12-10  3:22 Valient Gough

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