Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() inmmu_take_all_locks()

From: Andrea Arcangeli
Date: Thu Apr 01 2010 - 12:04:17 EST

On Thu, Apr 01, 2010 at 06:51:17PM +0300, Avi Kivity wrote:
> Can we use srcu now instead?

We can always switch to srcu. Switching to srcu is not a noop for all
mmu notifier invalidates only after these locks can schedule. At that
point, so with srcu + mutex in the rmap locks, all the mmu notifier
invalidates can schedule, allowing XPMEM to be synchronous its
invalidates, and making it safe.
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