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SubjectRe: Fix "perf tools: Synthesize GROUP_DESC feature in pipe mode" in the LT 4.14 branch
+cc Greg, stable

Greensky, James J <james.j.greensky@intel.com> 于2018年12月21日周五 上午11:48写道:
>
> Commit d38d272592737ea88a20 ("perf tools: Synthesize GROUP_DESC feature in pipe mode") broke the LT 4.14 branch when using event groups in pipe-mode.
>
> # perf record -e '{cycles,instructions,branches}' -- sleep 4 | perf report
> # To display the perf.data header info, please use --header/--header-only options
> #
> Oxd7c [0x60]: failed to process type: 80
> Error:
> Failed to process sample
>
> Commit a2015516c5c0be932a69 ("perf record: Synthesize features before events in pipe mode") is the fix. Can we get this cherry-picked and applied?
>

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