Messages in this thread | | | Date | Tue, 03 May 2011 08:35:53 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/6] x86: Allow the user not to build hw_breakpoints |
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On 04/27/2011 12:50 PM, Frederic Weisbecker wrote: > On Wed, Apr 27, 2011 at 11:54:17AM -0700, H. Peter Anvin wrote: >> Why do you have to be able to disable breakpoints to disable perf? That seems seriously backwards, especially since we had breakpoints long before perf... > > That started when we implemented breakpoints as counters. Then we realized that > ptrace had its own scheduling that was somehow duplicating what perf was doing. > So we have finally unified that under perf. The good point is that archs don't need > to care much about ptrace breakpoints tracking, just the interface. > > But yeah the bad point is that dependency.
It really is very bad... without breakpoints, you lose almost all debugging support.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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