On Wed, Jan 27, 2010 at 03:04:58AM -0800, Linus Torvalds wrote: > > > On Wed, 27 Jan 2010, Peter Zijlstra wrote: > > > > Right, so there's two aspects: > > > > 1) concurrency when inserting the probe > > That's the one I worried about. Stopping all threads will fix it, > obviously at a disastrous performance cost, but what do I care? As noted, > there are ways to do it safely with TLB switching, so it's fixable.
That said, inserting a probe is supposed to be a pretty rare operation, stopping all threads in a process shouldn't be painful for this aspect.
