netdev - Re: [PATCH net-next] tcp/dccp: add SLAB_DESTROY_BY

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Date:	Sat, 03 Oct 2015 13:25:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp/dccp: add SLAB_DESTROY_BY_RCU flag for
 request sockets

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 03 Oct 2015 06:27:28 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Before letting request sockets being put in TCP/DCCP regular
> ehash table, we need to add either :
> 
> - SLAB_DESTROY_BY_RCU flag to their kmem_cache
> - add RCU grace period before freeing them.
> 
> Since we carefully respected the SLAB_DESTROY_BY_RCU protocol
> like ESTABLISH and TIMEWAIT sockets, use it here.
> 
> req_prot_init() being only used by TCP and DCCP, I did not add
> a new slab_flags into their rsk_prot, but reuse prot->slab_flags
> 
> Since all reqsk_alloc() users are correctly dealing with a failure,
> add the __GFP_NOWARN flag to avoid traces under pressure.
> 
> Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.
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