linux-kernel - Re: Sleeping in RCU list traversal

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Message-Id: <1191781996.5587.3.camel@lappy>
Date:	Sun, 07 Oct 2007 20:33:16 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	junwang1234@...il.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: Sleeping in RCU list traversal


On Mon, 2007-10-08 at 01:56 +0900, Tetsuo Handa wrote:

> So, I don't need to grab a reference to "ptr"
> because memory region pointed by "ptr" will never be kfree()ed.
> And it is legal to use "ptr" after rcu_read_unlock()
> because memory region pointed by "ptr" will never be kfree()ed.

Still think that is a very BAD (tm) idea. Esp since with the help of RCU
there is hardly any performance loss of not doing proper deletes.


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