netdev - Re: [PATCH] xfrm: cache bundle lookup results in flow cache

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Date:	Sun, 21 Mar 2010 08:46:59 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teräs <timo.teras@....fi>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] xfrm: cache bundle lookup results in flow cache

On Sat, Mar 20, 2010 at 06:26:00PM +0200, Timo Teräs wrote:
>
> So should go ahead and:
> 1. modify flow cache to be more generic (have virtual put and get
>   for each object; and remove the atomic_t pointer)
> 2. modify flow cache to have slow and fast resolvers so we can
>   copy with the current sleeping requirement

I don't think we need either of these.  To support the sleep
requirement, just return -EAGAIN from the resolver when the
template can't be resolved.  Then the caller of flow_cache_lookup
can sleep as it does now.  It simply has to repeat the flow
cache lookup afterwards.

> 3. cache bundles instead of policies for outgoing stuff
> 4. kill find_bundle and just instantiate new ones if we get cache
>   miss
> 5. put all bundles to global hlist (since only place that walks
>   through them is gc, and stale bundle can be dst_free'd right
>   away); use genid's for policy to flush old bundles
> 6. dst_free and unlink bundle immediately if it's found to be stale

Sounds good.

Cheers,
-- 
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