ITVirtualMemoryInfo.m

#import "ITVirtualMemoryInfo.h"
#import "ITDebug.h"
#import <unistd.h>

@interface ITVirtualMemoryInfo (Private)
- (BOOL)refreshStats:(struct vm_statistics *)myStat;
@end

@implementation ITVirtualMemoryInfo

- (id)init {
	if ( ( self = [super init] ) ) {
		if ([self refreshStats:&stat] == NO) {
			self = nil;
		}
	}
	return self;
}

- (int)pageSize {
	return getpagesize();
}

- (int)freePages {
	[self refreshStats:&stat];
	return stat.free_count;
}

- (int)activePages {
	[self refreshStats:&stat];
	return stat.active_count;
}

- (int)inactivePages {
	[self refreshStats:&stat];
	return stat.inactive_count;
}

- (int)wiredPages {
	[self refreshStats:&stat];
	return stat.wire_count;
}

- (int)faults {
	[self refreshStats:&stat];
	return stat.faults;
}

- (int)copyOnWritePages {
	[self refreshStats:&stat];
	return stat.cow_faults;
}

- (int)zeroFilledPages {
	[self refreshStats:&stat];
	return stat.zero_fill_count;
}

- (int)reactivatedPages {
	[self refreshStats:&stat];
	return stat.reactivations;
}

- (int)pageins {
	[self refreshStats:&stat];
	return stat.pageins;
}

- (int)pageouts {
	[self refreshStats:&stat];
	return stat.pageouts;
}

- (int)hits {
	[self refreshStats:&stat];
	return stat.hits;
}

- (int)lookups {
	[self refreshStats:&stat];
	return stat.lookups;
}

- (int)hitratePercentage {
	[self refreshStats:&stat];
	if ( stat.lookups == 0 ) {
		return 0;
	} else {
		return ( ( stat.hits * 100 ) / stat.lookups );
	}
}

- (BOOL)refreshStats:(struct vm_statistics *)myStat {
	bzero(myStat,sizeof(myStat));
	mach_port_t myHost = mach_host_self();
	int count = HOST_VM_INFO_COUNT;
	ITDebugLog(@"%i",count);
	int returned = host_statistics(myHost, HOST_VM_INFO, myStat, &count);
	if ( returned != KERN_SUCCESS ) {
		ITDebugLog(@"Failed to get Statistics in -refreshStats method of ITVirtualMemoryInfo");
		ITDebugLog(@"%s",strerror(returned));
		return NO;
	} else {
		return YES;
	}
}

@end