netdev - Re: [PATCH] skb: Propagate pfmemalloc on skb from head page only

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Message-ID: <5141E055.9000309@parallels.com>
Date:	Thu, 14 Mar 2013 18:36:05 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, Mel Gorman <mgorman@...e.de>,
	Linux Netdev List <netdev@...r.kernel.org>,
	stable@...nel.org, Alexey Kuznetsov <kuznet@....inr.ac.ru>
Subject: Re: [PATCH] skb: Propagate pfmemalloc on skb from head page only

On 03/14/2013 06:34 PM, Eric Dumazet wrote:
> On Thu, 2013-03-14 at 18:23 +0400, Pavel Emelyanov wrote:
> 
>> Presumably you're right, but I don't understand how :( In order to trigger
>> this, we should have a huge page, that gets linked to an skb _before_ it
>> enters the TCP receive path. How can this happen when doing sendmsg/recvmsg?
> 
> Not only huge pages.
> 
> network now uses order-3 pages in both transmit and receive paths.

Ah, indeed! Thanks, Eric.
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