question: void tryToDrainBuffers ( ) { if ( evictionLock . tryLock ( ) ) { try { drainStatus . lazySet ( PROCESSING ) ; drainBuffers ( ) ; } finally { drainStatus . compareAndSet ( PROCESSING , IDLE ) ; evictionLock . unlock ( ) ; } } }
target:  Attempts to acquire the eviction lock and apply the pending operations, up to the amortized threshold, to the page replacement policy.