Messages in this thread | | | Date | Wed, 4 May 2011 01:12:43 +0200 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 3/6] x86: Allow the user not to build hw_breakpoints |
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On Tue, May 03, 2011 at 08:35:53AM -0700, H. Peter Anvin wrote: > 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.
Right, so it should be fine for embedded environment to disable breakpoints. It depends on CONFIG_EXPERT now.
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