Re: [PATCH 14/14] perf, x86: Discard zero length call entries in LBR call stack

On Fri, Jan 3, 2014 at 6:48 AM, Yan, Zheng wrote: > "Zero length call" uses the attribute of the call instruction to push > the immediate instruction pointer on to the stack and then pops off > that address into a register. This is accomplished without any matching > return instruction. It

Re: [PATCH 14/14] perf, x86: Discard zero length call entries in LBR call stack

On Fri, Jan 3, 2014 at 6:48 AM, Yan, Zheng zheng.z@intel.com wrote: Zero length call uses the attribute of the call instruction to push the immediate instruction pointer on to the stack and then pops off that address into a register. This is accomplished without any matching return

[PATCH 14/14] perf, x86: Discard zero length call entries in LBR call stack

"Zero length call" uses the attribute of the call instruction to push the immediate instruction pointer on to the stack and then pops off that address into a register. This is accomplished without any matching return instruction. It confuses the hardware and make the recorded call stack incorrect.

[PATCH 14/14] perf, x86: Discard zero length call entries in LBR call stack

Zero length call uses the attribute of the call instruction to push the immediate instruction pointer on to the stack and then pops off that address into a register. This is accomplished without any matching return instruction. It confuses the hardware and make the recorded call stack incorrect.