Comments (2)
aozhimin
commented on August 16, 2024
@laughingkid 是的，resident_size 确实获取不到准确的内存，正确的方式是使用 phys_footprint，这个从 WebKit 和 XNU 的源码都能够得到佐证。WebKit 代码
size_t memoryFootprint()
{
task_vm_info_data_t vmInfo;
mach_msg_type_number_t count = TASK_VM_INFO_COUNT;
kern_return_t result = task_info(mach_task_self(), TASK_VM_INFO, (task_info_t) &vmInfo, &count);
if (result != KERN_SUCCESS)
return 0;
return static_cast<size_t>(vmInfo.phys_footprint);
}
XNU 代码 中 Jetsam 中判断应用内存是否过大使用的也是 phys_footprint，2018 WWDC Session iOS Memory Deep Dive 对这块也有介绍，有兴趣可以去看下。
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aozhimin
commented on August 16, 2024
详细的讨论过程见这个 Issue-获取 App 内存不准
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