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package com.yahoo.nativec;
import com.sun.jna.Structure;
/**
* Gives access to the information provided by the C library mallinfo() function.
*
* @author baldersheim
*/
public class MallInfo extends NativeHeap {
private final static Throwable initException = NativeC.loadLibrary(MallInfo.class);
public static Throwable init() {
return initException;
}
@Structure.FieldOrder({"arena", "ordblks", "smblks", "hblks", "hblkhd", "usmblks", "fsmblks", "uordblks", "fordblks", "keepcost"})
public static class MallInfoStruct extends Structure {
public static class ByValue extends MallInfoStruct implements Structure.ByValue { }
public int arena; /* Non-mmapped space allocated (bytes) */
public int ordblks; /* Number of free chunks */
public int smblks; /* Number of free fastbin blocks */
public int hblks; /* Number of mmapped regions */
public int hblkhd; /* Space allocated in mmapped regions (bytes) */
public int usmblks; /* See below */
public int fsmblks; /* Space in freed fastbin blocks (bytes) */
public int uordblks; /* Total allocated space (bytes) */
public int fordblks; /* Total free space (bytes) */
public int keepcost; /* Top-most, releasable space (bytes) */
}
private static native MallInfoStruct.ByValue mallinfo();
private final MallInfoStruct mallinfo;
public MallInfo() {
mallinfo = mallinfo();
}
@Override
public long usedSize() {
long v = mallinfo.uordblks;
return v << 20; // Due to too few bits in ancient mallinfo vespamalloc reports in 1M units
}
@Override
public long totalSize() {
long v = mallinfo.arena;
return v << 20; // Due to too few bits in ancient mallinfo vespamalloc reports in 1M units
}
@Override
public long availableSize() {
long v = mallinfo.fordblks;
return v << 20; // Due to too few bits in ancient mallinfo vespamalloc reports in 1M units
}
}
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