[perfcounters] Fix calculation of free memory in mono_determine_physical_ram_availabl...

The implementation added in b5d0ffe7ddba53a6b17587fc43750bf5c0ec2f81 forgot to multiply vmstat.free_count (== number of free pages)
by the page size in the __APPLE__ case, making the reported number much smaller than the reality.

diff --git a/mono/metadata/mono-perfcounters.c b/mono/metadata/mono-perfcounters.c
index e622308066a44d2e8d632909c69007b00796381b..267f87d47350f6da4ff85b3c4f966a2d6c63e8e6 100644 (file)
--- a/mono/metadata/mono-perfcounters.c
+++ b/mono/metadata/mono-perfcounters.c
@@ -498,13 +498,16 @@ mono_determine_physical_ram_available_size (void)
        return ((guint64) value.t_free * page_size) / 1024;
 #elif defined (__APPLE__)
        mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
+       mach_port_t host = mach_host_self();
+       vm_size_t page_size;
        vm_statistics_data_t vmstat;
-       if (KERN_SUCCESS != host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmstat, &count)) {
+       if (KERN_SUCCESS != host_statistics(host, HOST_VM_INFO, (host_info_t)&vmstat, &count)) {
                g_warning ("Mono was unable to retrieve memory usage!");
                return 0;
        }
 
-       return (guint64) vmstat.free_count;
+       host_page_size(host, &page_size);
+       return (guint64) vmstat.free_count * page_size;
 
 #elif defined (HAVE_SYSCONF)
        guint64 page_size = 0, num_pages = 0;