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I read your latest blog post about profile-guided optisation, which is really interesting.
I have one question.. What perf options/arguments did you use to get INST_RETIRED.ANY and ICACHE.MISSES ? perf stat -e cache-misses? I'm not sure what options give these numbers..
perf record -e r03c -e r1c2 -e rc0 -e r280 -c 250000 sql/mysqld ... INST_RETIRED.ANY is -e rc0. ICACHE.MISSES is r280. Note that except for a few, the performance counters are processer specific. The full list of available counters is found in "Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3B: System Programming Guide, Part 2". Eg. the ones for Sandy Bridge are found in section 19.4: http://www.intel.com/content/www/us/en/processors/architectures-software-dev... (For example, ICACHE.MISSES is umask=0x02 and eventnum=0x80, hence r280.) - Kristian.