netdev - Re: [PATCH net-next 1/3] net: allow > 0 order atomic page alloc in skb_page_frag

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Date:	Thu, 02 Jan 2014 17:26:36 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Debabrata Banerjee <dbavatar@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, mwdalton@...gle.com,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	rusty@...tcorp.com.au, mst@...hat.com, jasowang@...hat.com,
	virtualization@...ts.linux-foundation.org,
	"Banerjee, Debabrata" <dbanerje@...mai.com>, jbaron@...mai.com,
	Joshua Hunt <johunt@...mai.com>
Subject: Re: [PATCH net-next 1/3] net: allow > 0 order atomic page alloc in
 skb_page_frag_refill

On Thu, 2014-01-02 at 16:56 -0800, Eric Dumazet wrote:

> 
> My suggestion is to use a recent kernel, and/or eventually backport the
> mm fixes if any.
> 
> order-3 allocations should not reclaim 2GB out of 8GB.
> 
> There is a reason PAGE_ALLOC_COSTLY_ORDER exists and is 3

Hmm... it looks like I missed __GFP_NORETRY



diff --git a/net/core/sock.c b/net/core/sock.c
index 5393b4b719d7..5f42a4d70cb2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1872,7 +1872,7 @@ bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio)
 		gfp_t gfp = prio;
 
 		if (order)
-			gfp |= __GFP_COMP | __GFP_NOWARN;
+			gfp |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY;
 		pfrag->page = alloc_pages(gfp, order);
 		if (likely(pfrag->page)) {
 			pfrag->offset = 0;



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