virtual-memory_开发者

Is Virtual memory really useful all the time?

Virtual memory is a good concept currently used by modern operating systems. But I was stuck answering a question and was not sure enough about it. Here is the question:[详细]

2023-04-12 04:07 分类：问答

What's exactly behind / inside iPhone memory management?

This question is NOT about retain/release things in iphone memory management. I understand the routine quite well and there is no memory leak things in my app.[详细]

2023-04-09 01:15 分类：问答

Reserving Shared Memory with No File Backing (Linux/Windows) (boost::interprocess)

How can I reserve and allocate shared memory without the backing of a file? I\'m trying to reserve a large (many tens of GiBs) chunk of shared memory and use it in multiple processes as a form of IPC.[详细]

2023-04-05 10:08 分类：问答

virtual memory on compute nodes in a grid

When I run a job on a node, using PBS, and I get finally in the job report: resources_used.mem开发者_开发问答=1616024kb[详细]

2023-04-04 17:38 分类：问答

Windows Memory Workings - page tables, and data

I was trying to understand 开发者_如何学运维following: I know that page tables are built for translation between virtual memory and physical memory by virtual memory manager at some point. Since the[详细]

2023-04-02 23:42 分类：问答

linux kernel, userspace buffers, do access_ok and wait create a race condition?

In the following code (the read implementation for a char driver), is it possible for MMU TLB entries to change during wait_event_interruptible, such that __put_user causes an exception even though ac[详细]

2023-03-24 16:29 分类：问答

virtual addressing v.s. physical addressing

I do not quite understand the benefit of \"multiple independent virtual address, which point to the same physical address\", even though I read many books and posts,[详细]

2023-03-20 18:42 分类：问答

How to get a page from a userspace process for a given task in Linux?

What exactly does the virt_to_page function return, does it return the page given an address in the kernel space or does it return a page given an address in user space? As far as I can tell it seems[详细]

2023-03-20 07:20 分类：问答

Is the virtual address 0x1FE0C0 below the "line" or above the line?

I\'m studying z/OS and I was asked if the virtual address 0x1FE0C0 is: A. above the line. B. above the bar and below the line.[详细]

2023-03-18 01:23 分类：问答

Linux kernel: Where do the process page tables reside?

Being used only by the kernel, they should only lie in the addresses above PAGE_OFFSET. But I was reading this page and at the end of it (in the IRC convo) I read the following lines which really conf[详细]

2023-03-14 08:12 分类：问答