[JGIT PATCH 2/2] Allow core.packedGitLimit to exceed "2 g"

["Shawn O. Pearce" <spearce@spearce.org>]

A 64 bit JVM might actually be able to dedicate more than 2 GiB of
memory to the window cache, and on a busy server, this may be an
ideal configuration since JGit can't always reliably use mmap.  By
treating the limit as a long we increase our range to 2^63, which
is far beyond what any JVM heap would be able to actually support.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../src/org/spearce/jgit/lib/WindowCache.java      |   13 +++++++------
 .../org/spearce/jgit/lib/WindowCacheConfig.java    |    8 ++++----
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCache.java b/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCache.java
index 0c60853..b6a35ad 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCache.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCache.java
@@ -41,6 +41,7 @@
 import java.io.IOException;
 import java.lang.ref.ReferenceQueue;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * Caches slices of a {@link PackFile} in memory for faster read access.
@@ -140,7 +141,7 @@ static final void purge(final PackFile pack) {
 
 	private final int maxFiles;
 
-	private final int maxBytes;
+	private final long maxBytes;
 
 	private final boolean mmap;
 
@@ -150,7 +151,7 @@ static final void purge(final PackFile pack) {
 
 	private final AtomicInteger openFiles;
 
-	private final AtomicInteger openBytes;
+	private final AtomicLong openBytes;
 
 	private WindowCache(final WindowCacheConfig cfg) {
 		super(tableSize(cfg), lockCount(cfg));
@@ -161,7 +162,7 @@ private WindowCache(final WindowCacheConfig cfg) {
 		windowSize = 1 << windowSizeShift;
 
 		openFiles = new AtomicInteger();
-		openBytes = new AtomicInteger();
+		openBytes = new AtomicLong();
 
 		if (maxFiles < 1)
 			throw new IllegalArgumentException("Open files must be >= 1");
@@ -173,7 +174,7 @@ int getOpenFiles() {
 		return openFiles.get();
 	}
 
-	int getOpenBytes() {
+	long getOpenBytes() {
 		return openBytes.get();
 	}
 
@@ -233,12 +234,12 @@ private long toStart(final long offset) {
 
 	private static int tableSize(final WindowCacheConfig cfg) {
 		final int wsz = cfg.getPackedGitWindowSize();
-		final int limit = cfg.getPackedGitLimit();
+		final long limit = cfg.getPackedGitLimit();
 		if (wsz <= 0)
 			throw new IllegalArgumentException("Invalid window size");
 		if (limit < wsz)
 			throw new IllegalArgumentException("Window size must be < limit");
-		return 5 * (limit / wsz) / 2;
+		return (int) Math.min(5 * (limit / wsz) / 2, 2000000000);
 	}
 
 	private static int lockCount(final WindowCacheConfig cfg) {
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCacheConfig.java b/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCacheConfig.java
index ea28164..97edd3a 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCacheConfig.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/WindowCacheConfig.java
@@ -47,7 +47,7 @@
 
 	private int packedGitOpenFiles;
 
-	private int packedGitLimit;
+	private long packedGitLimit;
 
 	private int packedGitWindowSize;
 
@@ -85,7 +85,7 @@ public void setPackedGitOpenFiles(final int fdLimit) {
 	 * @return maximum number bytes of heap memory to dedicate to caching pack
 	 *         file data. <b>Default is 10 MB.</b>
 	 */
-	public int getPackedGitLimit() {
+	public long getPackedGitLimit() {
 		return packedGitLimit;
 	}
 
@@ -94,7 +94,7 @@ public int getPackedGitLimit() {
 	 *            maximum number bytes of heap memory to dedicate to caching
 	 *            pack file data.
 	 */
-	public void setPackedGitLimit(final int newLimit) {
+	public void setPackedGitLimit(final long newLimit) {
 		packedGitLimit = newLimit;
 	}
 
@@ -162,7 +162,7 @@ public void setDeltaBaseCacheLimit(final int newLimit) {
 	 */
 	public void fromConfig(final RepositoryConfig rc) {
 		setPackedGitOpenFiles(rc.getInt("core", null, "packedgitopenfiles", getPackedGitOpenFiles()));
-		setPackedGitLimit(rc.getInt("core", null, "packedgitlimit", getPackedGitLimit()));
+		setPackedGitLimit(rc.getLong("core", null, "packedgitlimit", getPackedGitLimit()));
 		setPackedGitWindowSize(rc.getInt("core", null, "packedgitwindowsize", getPackedGitWindowSize()));
 		setPackedGitMMAP(rc.getBoolean("core", null, "packedgitmmap", isPackedGitMMAP()));
 		setDeltaBaseCacheLimit(rc.getInt("core", null, "deltabasecachelimit", getDeltaBaseCacheLimit()));
-- 
1.6.3.2.367.gf0de