linux-kernel - Re: BFS cpu scheduler and skip list implementation

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Message-Id: <201109241214.21458.kernel@kolivas.org>
Date:	Sat, 24 Sep 2011 12:14:21 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: BFS cpu scheduler and skip list implementation

On Sat, 24 Sep 2011 11:21:06 Andi Kleen wrote:
> Con Kolivas <kernel@...ivas.org> writes:
> > +struct nodeStructure {
> > +	int level;	/* Levels in this structure */
> > +	keyType key;
> > +	valueType value;
> > +	skiplist_node *next[16];
> > +	skiplist_node *prev[16];
> > +};
> 
> That's 128 byte / 2 cache lines, not too bad, but it limits
> the maximum number of tasks that can be efficiently handled
> (my guess to around 64k with maxlevel == 16, but someone may
> correct me on that)

Thanks very much for your informed comments. Do you mean once 64k of tasks are 
queued concurrently, or after 64k of entries have gone in +/- been removed?

Con

-- 
-ck
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