Re: [RFC][PATCH] module: Optimize __module_address() using a latched RB-tree

[Ingo Molnar <mingo@kernel.org>]

* Peter Zijlstra <peterz@infradead.org> wrote:

> +static struct module *mod_tree_find(unsigned long addr)
> +{
> +	struct module *m;
> +	unsigned int seq;
> +
> +	do {
> +		seq = raw_read_seqcount(&mod_tree.seq);
> +		m = __tree_find(&mod_tree.tree[seq & 1], addr);
> +	} while (read_seqcount_retry(&mod_tree.seq, seq));
> +
> +	return m;
> +}

Btw., if your approach works out fine I bet we could add 
one more optimization as well: a PER_CPU(last_module_found) 
front cache would help as well, as usually there's quite a 
bit of repetition between addresses being looked up and the 
resulting modules.

Thanks,

	Ingo