netdev - Re: [PATCH 07/17] net: Introduce sk_gfp_atomic() to allow addition of GFP flags depending on the individual socket

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Date:	Wed, 20 Jun 2012 14:06:39 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Subject: Re: [PATCH 07/17] net: Introduce sk_gfp_atomic() to allow addition
 of GFP flags depending on the individual socket

On Wed, 2012-06-20 at 12:44 +0100, Mel Gorman wrote:
> Introduce sk_gfp_atomic(), this function allows to inject sock specific
> flags to each sock related allocation. It is only used on allocation
> paths that may be required for writing pages back to network storage.
> 
> [davem@...emloft.net: Use sk_gfp_atomic only when necessary]
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Mel Gorman <mgorman@...e.de>
> Acked-by: David S. Miller <davem@...emloft.net>
> ---
>  include/net/sock.h    |    5 +++++
>  net/ipv4/tcp_output.c |    9 +++++----
>  net/ipv6/tcp_ipv6.c   |    8 +++++---
>  3 files changed, 15 insertions(+), 7 deletions(-)
> 

> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 803cbfe..440b47e 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -2461,7 +2461,8 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
>  
>  	if (cvp != NULL && cvp->s_data_constant && cvp->s_data_desired)
>  		s_data_desired = cvp->s_data_desired;
> -	skb = sock_wmalloc(sk, MAX_TCP_HEADER + 15 + s_data_desired, 1, GFP_ATOMIC);
> +	skb = sock_wmalloc(sk, MAX_TCP_HEADER + 15 + s_data_desired, 1,
> +			   sk_gfp_atomic(sk, GFP_ATOMIC));
>  	if (skb == NULL)
>  

This bit no longer applies on net-next, sock_wmalloc() was changed to a
mere alloc_skb()


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