RE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86platform

[Ma, Ling]

> 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.

Thanks
Ling 

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