netdev - Re: [PATCH 3/3] net: Convert TCP & DCCP hash tables to use RCU / hlist

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Message-ID: <Pine.LNX.4.64.0811130805530.19293@quilx.com>
Date:	Thu, 13 Nov 2008 08:08:18 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Corey Minyard <minyard@....org>,
	Stephen Hemminger <shemminger@...tta.com>,
	benny+usenet@...rsen.dk,
	Linux Netdev List <netdev@...r.kernel.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Christian Bell <christian@...i.com>
Subject: Re: [PATCH 3/3] net: Convert TCP & DCCP hash tables to use RCU /
 hlist_nulls

On Thu, 13 Nov 2008, Eric Dumazet wrote:

> So yes, this bit should be documented, since SLAB_DESTROY_BY_RCU is
> not really used in linux kernel at this moment.

It is used for the anonymous vmas. That is the purpose that Hugh
introduced it for since he saw regression if he would use straight rcu
freeing. See mm/rmap.c. SLAB_DESTROY_BY_RCU a pretty strange way of
using RCU and slab so it should always be documented in detail.

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