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SubjectRe: [PATCH] perf diff: Report noisy for cycles diff
On Fri, Jul 12, 2019 at 03:53:55PM +0800, Jin Yao wrote:
> This patch prints the stddev and hist for the cycles diff of
> program block. It can help us to understand if the cycles diff
> is noisy or not.

I'm getting compile error:

CC builtin-diff.o
builtin-diff.c: In function ‘compute_cycles_diff’:
builtin-diff.c:712:10: error: taking the absolute value of unsigned type ‘u64’ {aka ‘long unsigned int’} has no effect [-Werror=absolute-value]
712 | labs(pair->block_info->cycles_spark[i] -
| ^~~~
cc1: all warnings being treated as errors
mv: cannot stat './.builtin-diff.o.tmp': No such file or directory


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