Re: [PATCH v2] mm: per-thread vma caching

[Peter Zijlstra <peterz@infradead.org>]

On Tue, Feb 25, 2014 at 10:16:46AM -0800, Davidlohr Bueso wrote:
> +void vmacache_invalidate_all(void)
> +{
> +	struct task_struct *g, *p;
> +
> +	rcu_read_lock();
> +	for_each_process_thread(g, p) {
> +		/*
> +		 * Only flush the vmacache pointers as the
> +		 * mm seqnum is already set and curr's will
> +		 * be set upon invalidation when the next
> +		 * lookup is done.
> +		 */
> +		memset(p->vmacache, 0, sizeof(p->vmacache));
> +	}
> +	rcu_read_unlock();
> +}

With all the things being said on this particular piece already; I
wanted to add that the iteration there is incomplete; we can clone()
using CLONE_VM without using CLONE_THREAD.

Its not common, but it can be done. In that case the above iteration
will miss a task that shares the same mm.

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