问题描述
我正在考虑''
''是从另一个角度看问题的一个相关问题，但没有解决方案。
'How to know whether a pointer is in physical memory or it will trigger a Page Fault?' is a related question looking at the problem from the other side, but does not have a solution.
我希望能够将内存中的某些数据加载到寄存器中，但是如果当前内存已被调出，则将中止加载而不是发生页面错误。我需要代码可以在Windows和Linux上的用户空间中工作，而无需任何标准权限。
I wish to be able to load some data from memory into a register, but have the load abort rather than getting a page fault, if the memory is currently paged out. I need the code to work in user space on both Windows and Linux without needing any none standard permission.
（理想上，我也想可以在TLB错误时中止。）
(Ideally, I would also like to abort on a TLB fault.)
推荐答案
TXT-NI功能的RTM（受限事务存储）部分可以禁止例外：
The RTM (Restricted Transactional Memory) part of the TXT-NI feature allows to suppress exceptions:
我从没使用过RTM，但是它应该像这样工作：
I've never used RTM but it should work something like this:
xbegin fallback
; Don't fault here
xend
; Somewhere else
fallback:
; Retry non-transactionally
请注意，由于多种原因可以中止交易，请参见第16.8.3.2章。英特尔手册第1卷。
另请注意，RTM并非无处不在。
Note that a transaction can be aborted for many reasons, see chapter 16.8.3.2 of the Intel manual volume 1.Also note that RTM is not ubiquitous.
除了RTM之外，我无法想出另一种抑制负载的方法，因为它必须返回一个值或最终发出中止状态的信号（与#PF相同） 。
Besides RTM I cannot think of another way to suppress a load since it must return a value or eventually signal an abort condition (which would be the same as a #PF).
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