[PATCH v2 2/7] perf, x86: Basic Haswell LBR call stack support

From: "Yan, Zheng" The new HSW call stack feature provides a facility such that unfiltered call data will be collected as normal, but as return instructions are executed the last captured branch record is popped from the LBR stack. Thus, branch information relative to leaf functions will not be c

[PATCH V2 2/7] perf, x86: Basic Haswell LBR call stack support

From: "Yan, Zheng" The new HSW call stack feature provides a facility such that unfiltered call data will be collected as normal, but as return instructions are executed the last captured branch record is popped from the LBR stack. Thus, branch information relative to leaf functions will not be c