81fc7ab5c5
Eviction changes allowing to evict (remap) cachelines while holding hash bucket write lock instead of global metadata write lock. As eviction (replacement) is now tightly coupled with request, each request uses eviction size equal to number of its unmapped cachelines. Evicting without global metadata write lock is possible thanks to the fact that remaping is always performed while exclusively holding cacheline (read or write) lock. So for a cacheline on LRU list we acquire cacheline lock, safely resolve hash and consequently write-lock hash bucket. Since cacheline lock is acquired under hash bucket (everywhere except for new eviction implementation), we are certain that noone acquires cacheline lock behind our back. Concurrent eviction threads are eliminated by holding eviction list lock for the duration of critial locking operations. Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com> |
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