netdev - Re: [PATCH] mm: make page pfmemalloc check more robust

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Message-ID: <1439476856.7960.8.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 13 Aug 2015 07:40:56 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	mhocko@...nel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>, Jiri Bohac <jbohac@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm: make page pfmemalloc check more robust

On Thu, 2015-08-13 at 11:13 +0200, Vlastimil Babka wrote:

> Given that this apparently isn't the first case of this localhost issue, 
> I wonder if network code should just clear skb->pfmemalloc during send 
> (or maybe just send over localhost). That would be probably easier than 
> distinguish the __skb_fill_page_desc() callers for send vs receive.

Would this still needed after this patch ?

It is sad we do not have a SNMP counter to at least count how often we
drop skb because pfmemalloc is set.

I'll provide such a patch.


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