Messages in this thread | | | Date | Thu, 19 Dec 2013 16:02:26 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow tracing units |
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On Thu, Dec 19, 2013 at 03:49:42PM +0100, Frederic Weisbecker wrote: > On Thu, Dec 19, 2013 at 04:30:53PM +0200, Alexander Shishkin wrote: > > Or the interface and implementation of BTS support in the kernel > > discourage its use and that is why it is so rarely used. > > I never heard complains about it. It's a simple dump of from/to address couples. > I just think nobody take the time to develop userspace tooling to exploit it. > But it's famous slowness might have had a bad influence on this. And may be > also the fact that it's very architecture specific. AMD doesn't support BTS if I recall > correctly. Or may be it has its own different implementation?
No AMD doesn't do anything like that.
There was some attempt to cure some of the wobblies:
https://lkml.org/lkml/2013/7/8/154
But people never pursued that.
That said, if people want overwrite mode to work for PT we'd need to fix the same thing.
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