linux-kernel - Re: rhashtable: Use __vmalloc with GFP

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Message-Id: <20151204.165334.1119277452308794437.davem@davemloft.net>
Date:	Fri, 04 Dec 2015 16:53:34 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	eric.dumazet@...il.com, phil@....cc, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tgraf@...g.ch,
	fengguang.wu@...el.com, wfg@...ux.intel.com, lkp@...org
Subject: Re: rhashtable: Use __vmalloc with GFP_ATOMIC for table allocation

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Fri, 4 Dec 2015 22:39:56 +0800

> When an rhashtable user pounds rhashtable hard with back-to-back
> insertions we may end up growing the table in GFP_ATOMIC context.
> Unfortunately when the table reaches a certain size this often
> fails because we don't have enough physically contiguous pages
> to hold the new table.
> 
> Eric Dumazet suggested (and in fact wrote this patch) using
> __vmalloc instead which can be used in GFP_ATOMIC context.
> 
> Reported-by: Phil Sutter <phil@....cc>
> Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied, thanks Herbert.
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