fix promotion stats #3
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and add additional parameters to control allocation and eviction of items.
instead of relying on transparent synchronization mechanims (wait context).
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Summary: AdRanker ASAN canary flagged a possible UBSan violation. ## Error Failed Run: https://fburl.com/servicelab/apytosry ``` #0 0x562e3adb59bc in facebook::cachelib::objcache2::ObjectCacheSizeController<facebook::cachelib::CacheAllocator<facebook::cachelib::LruCacheTrait> >::work() buck-out/v2/gen/fbcode/47d914adeee3d982/cachelib/experimental/objcache2/__object-cache__/headers/cachelib/experimental/objcache2/ObjectCacheSizeController-inl.h #1 0x562de7610f78 in facebook::cachelib::PeriodicWorker::loop() fbcode/cachelib/common/PeriodicWorker.cpp:55 #2 0x7f7632c524e4 in execute_native_thread_routine /home/engshare/third-party2/libgcc/11.x/src/gcc-11.x/x86_64-facebook-linux/libstdc++-v3/src/c++11/../../../.././libstdc++-v3/src/c++11/thread.cc:82:18 #3 0x7f7632f6ec0e in start_thread /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/nptl/pthread_create.c:434:8 #4 0x7f76330011db in clone3 /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 UndefinedBehaviorSanitizer: integer-divide-by-zero buck-out/v2/gen/fbcode/47d914adeee3d982/cachelib/experimental/objcache2/__object-cache__/headers/cachelib/experimental/objcache2/ObjectCacheSizeController-inl.h:33:40 in ``` Reviewed By: jiayuebao Differential Revision: D39024188 fbshipit-source-id: 64ad644c360565e638fa3ca74616a315038382ab
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needed to initialize promotions variable to 0, also changed from bytes to class id in the counters maps