Re: linux-next: add utrace tree

From: Frederic Weisbecker
Date: Wed Jan 27 2010 - 11:01:20 EST

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.

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