Messages in this thread | | | Date | Fri, 27 Mar 2015 13:17:42 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/1] perf/x86: filter branches for PEBS event |
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On Thu, Mar 26, 2015 at 02:13:23PM -0400, kan.liang@intel.com wrote: > This patch move intel_shared_regs_constraints for branch_reg ahead of > intel_pebs_constraints.
Why not all shared regs?
> intel_shared_regs_constraints for branch_reg doesn't modify event->hw, > so it's safe to be called before intel_pebs_constraints. > intel_shared_regs_constraints for branch_reg also special case when it > returns &emptyconstraint. It put constraints for extra_reg. This patch > remove it. Because it will never get constraints for extra_reg if return > is &emptyconstraint.
-ENOPARSE.
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