| /* |
| * Crail: A Multi-tiered Distributed Direct Access File System |
| * |
| * Author: Patrick Stuedi <stu@zurich.ibm.com> |
| * |
| * Copyright (C) 2016, IBM Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package com.ibm.crail.storage.rdma; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import com.ibm.crail.CrailBuffer; |
| import com.ibm.disni.rdma.verbs.IbvMr; |
| import com.ibm.disni.rdma.verbs.IbvPd; |
| |
| public class MrCache { |
| private ConcurrentHashMap<Integer, DeviceMrCache> cache; |
| private AtomicLong cacheOps; |
| private AtomicLong cacheMisses; |
| |
| public MrCache(){ |
| this.cache = new ConcurrentHashMap<Integer, DeviceMrCache>(); |
| this.cacheMisses = new AtomicLong(0); |
| this.cacheOps = new AtomicLong(0); |
| } |
| |
| public DeviceMrCache getDeviceCache(IbvPd pd) throws IOException { |
| DeviceMrCache deviceCache = cache.get(pd.getHandle()); |
| if (deviceCache == null) { |
| deviceCache = new DeviceMrCache(pd); |
| DeviceMrCache oldLine = cache.putIfAbsent(pd.getHandle(), deviceCache); |
| if (oldLine != null) { |
| deviceCache = oldLine; |
| } |
| } |
| return deviceCache; |
| } |
| |
| public void close() throws IOException { |
| for (Iterator<DeviceMrCache> iter1 = cache.values().iterator(); iter1.hasNext(); ){ |
| DeviceMrCache line = iter1.next(); |
| line.close(); |
| } |
| cache.clear(); |
| } |
| |
| public long ops() { |
| return cacheOps.get(); |
| } |
| |
| public long missed() { |
| return cacheMisses.get(); |
| } |
| |
| public void reset(){ |
| this.cacheOps.set(0); |
| this.cacheMisses.set(0); |
| } |
| |
| public static class DeviceMrCache { |
| private IbvPd pd; |
| private ConcurrentHashMap<Long, IbvMr> device; |
| |
| public DeviceMrCache(IbvPd pd){ |
| this.pd = pd; |
| this.device = new ConcurrentHashMap<Long, IbvMr>(); |
| } |
| |
| public IbvMr get(CrailBuffer buffer) throws IOException{ |
| IbvMr mr = device.get(buffer.address()); |
| return mr; |
| } |
| |
| public void put(IbvMr mr) throws IOException{ |
| device.put(mr.getAddr(), mr); |
| } |
| |
| public void close() throws IOException { |
| for (Iterator<IbvMr> iter2 = device.values().iterator(); iter2.hasNext(); ){ |
| IbvMr mr = iter2.next(); |
| mr.deregMr().free(); |
| } |
| device.clear(); |
| } |
| |
| public IbvPd getPd() { |
| return pd; |
| } |
| } |
| } |
| |