netdev - Re: [PATCH net 1/2] rhashtable: Schedule async resize when sync realloc fails

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Message-ID: <20150422074344.GA8882@gondor.apana.org.au>
Date:	Wed, 22 Apr 2015 15:43:44 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, kaber@...sh.net
Subject: Re: [PATCH net 1/2] rhashtable: Schedule async resize when sync
 realloc fails

On Wed, Apr 22, 2015 at 09:41:45AM +0200, Thomas Graf wrote:
> When rhashtable_insert_rehash() fails with ENOMEM, this indicates that
> we can't allocate the necessary memory in the current context but the
> limits as set by the user would still allow to grow.
> 
> Thus attempt an async resize in the background where we can allocate
> using GFP_KERNEL which is more likely to succeed. The insertion itself
> will still fail to indicate pressure.
> 
> This fixes a bug where the table would never continue growing once the
> utilization is above 100%.
> 
> Fixes: ccd57b1bd324 ("rhashtable: Add immediate rehash during insertion")
> Signed-off-by: Thomas Graf <tgraf@...g.ch>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
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Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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