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    SubjectRE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform
    > a key question is.. how much more memory do you have free due to -Os?
    > (because memory is cache is performance on a system level as well)
    The kernel code size from Os is 12M, that from O2 is 14M.
    > and how much less icache pressure is there?
    From perf stat report, cache reference(unified cache) from O2 is almost the same with Os.


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