Re: [PATCH V7 13/17] perf, x86: enable LBR callstack when recording callchain

[Peter Zijlstra]

On Tue, Nov 04, 2014 at 09:56:09PM -0500, Kan Liang wrote:
> From: Yan, Zheng <zheng.z.yan@xxxxxxxxx>
> 
> Only enable LBR callstack when user requires fp callgraph. The feature
> is not available when PERF_SAMPLE_BRANCH_STACK or PERF_SAMPLE_STACK_USER
> is required.
> Also, this feature only affects how to get user callchain. The kernel
> callchain is always got by frame pointers.

Since FP callchains should not change, this doesn't appear to make any
sense either.
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