????????Perf??Linux kernel???????????????????Perf????????????Linux Kernel????????????????????????Kernel??new feature??pef??????????????????cashe miss?????????????????????????????????

????1.perf????

??????????????????????????????????п?????????????????а????????????????????????vmlinux????????????????????????linux??????linux/tools/perf

????make

????make install

?????????

????1????????????????б????????????????????????????????????е?warning????????error?????????????????????-Werror???gcc??????????makefile????????????-Werror??????????-Werror?????????????????

????2?????????perf????г???????λ???????????????????PATH·???У?????????價??????PATH

????2.perf?????????

???????????????? perf??Oprofile ??????????????????????в?????????????????? tick ?ж???в????????? tick ?ж??????????????????????ж????????????????????????? 90% ?????????????? foo() ?????? 90% ????????????????? foo() ?????????С??????????????????????????????????????????????????????????????????????? tick ????????????????????????????Щ???????????????????

??????????????·??????????????????????????????????ò????????????

?????????? ( ?? tick) ?????????????????????????????????????

?????? cache miss ??????????????????? cache miss ???????? cache ?Ч????????????Щ????????С???????

??????????????????????? perf ??????????????????????Щ??

???????perf list????root????????У????????г????е???????

???????????????????

????1??Hardware Event ???? PMU ?????????????????? cache ???У?????????????????????????????????????????Щ??????в?????

????2??Software Event ???????????????????????????л???tick ???? ;

????3??Tracepoint event ??????е??? tracepoint ???????????????Щ tracepoint ?????ж?????????????????????????? slab ?????????????????

?????????????????????????????????????????????????????????????????? event ????????????????