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    SubjectRe: [PATCH v2 2/2] scripts: ftrace - move the nop-processing in ftrace_init to compile time
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    在 2021/11/16 下午4:10, Peter Zijlstra 写道:
    > On Tue, Nov 16, 2021 at 10:49:42AM +0800, Yinan Liu wrote:
    >> In some business scenarios, GCC versions are so old that
    >> optimizations in ftrace cannot be completed, such as
    >> -mrecord-mcount and -mnop-mcount. The recordmCount in the
    >> kernel is actually used. In this case, ftrace_init will
    >> consume a period of time, usually around 9~12ms. Do nop
    >> substitution in recordmcount.c to speed up ftrace_init.
    >
    > I really don't buy this.. if you can build a fresh kernel, you can
    > install a fresh gcc too -- and if you care about performance that's a
    > very good idea anyway.
    >
    Thanks! You are right. We should get rid of the burden.

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