Re: [PATCH] net: use __GFP_NORETRY for high order allocations

From: David Miller
Date: Fri Feb 07 2014 - 01:29:45 EST

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Thu, 06 Feb 2014 10:42:42 -0800

> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> sock_alloc_send_pskb() & sk_page_frag_refill()
> have a loop trying high order allocations to prepare
> skb with low number of fragments as this increases performance.
> Problem is that under memory pressure/fragmentation, this can
> trigger OOM while the intent was only to try the high order
> allocations, then fallback to order-0 allocations.
> We had various reports from unexpected regressions.
> According to David, setting __GFP_NORETRY should be fine,
> as the asynchronous compaction is still enabled, and this
> will prevent OOM from kicking as in :
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Acked-by: David Rientjes <rientjes@xxxxxxxxxx>

Applied, do we want this for -stable?
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